The United States Geological Survey (USGS) is working cooperatively with the National Oceanic and Atmospheric Association (NOAA) to interpret the surficial geology in estuaries along the coast of the northeastern United States. The purpose of our present study is to determine the distributions of surficial sediments and sedimentary environments in two areas of Narragansett Bay, Rhode Island, using sidescan sonar imagery, high-resolution bathymetry, and sediment data. This study provides a framework for future studies on topics such as benthic habitats and oceanographic processes that control the transport and distribution of bottom sediments. This study mapped two separate areas totalling about 33 km² One area lies in West Passage between Plum Point, Quonset Point and Conanicut Island; the other area lies in East Passage around Dyer Island and extends south of Prudence Island.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20061199","usgsCitation":"McMullen, K.Y., Poppe, L.J., Signell, R.P., Denny, J.F., Crocker, J.M., Beaver, A.L., and Schattgen, P., 2007, Surficial geology in central Narragansett Bay, Rhode Island: interpretations of sidescan sonar and multibeam bathymetry: U.S. Geological Survey Open-File Report 2006-1199, HTML Document, https://doi.org/10.3133/ofr20061199.","productDescription":"HTML Document","costCenters":[{"id":680,"text":"Woods Hole Science Center","active":false,"usgs":true}],"links":[{"id":9174,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2006/1199/","text":"Index Page","linkFileType":{"id":5,"text":"html"}},{"id":195452,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr20061199.PNG"},{"id":395720,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_80461.htm"}],"country":"United States","state":"Rhode Island","otherGeospatial":"Narragansett Bay","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -71.41593933105469,\n 41.5198886863019\n ],\n [\n -71.28787994384766,\n 41.5198886863019\n ],\n [\n -71.28787994384766,\n 41.6010669423553\n ],\n [\n -71.41593933105469,\n 41.6010669423553\n ],\n [\n -71.41593933105469,\n 41.5198886863019\n ]\n ]\n ]\n }\n }\n ]\n}","contact":"","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae3e4b07f02db689168","contributors":{"authors":[{"text":"McMullen, Katherine Y. kmcmullen@usgs.gov","contributorId":24036,"corporation":false,"usgs":true,"family":"McMullen","given":"Katherine","email":"kmcmullen@usgs.gov","middleInitial":"Y.","affiliations":[],"preferred":false,"id":290227,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Poppe, Larry J.","contributorId":55913,"corporation":false,"usgs":true,"family":"Poppe","given":"Larry","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":290230,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Signell, Richard P. rsignell@usgs.gov","contributorId":1435,"corporation":false,"usgs":true,"family":"Signell","given":"Richard","email":"rsignell@usgs.gov","middleInitial":"P.","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":290226,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Denny, Jane F. 0000-0002-3472-618X jdenny@usgs.gov","orcid":"https://orcid.org/0000-0002-3472-618X","contributorId":418,"corporation":false,"usgs":true,"family":"Denny","given":"Jane","email":"jdenny@usgs.gov","middleInitial":"F.","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":290225,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Crocker, Jim M.","contributorId":36642,"corporation":false,"usgs":true,"family":"Crocker","given":"Jim","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":290228,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Beaver, Andrew L.","contributorId":78832,"corporation":false,"usgs":true,"family":"Beaver","given":"Andrew","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":290231,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Schattgen, P. 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The Hanson Formation dinosaurs are important for understanding early dinosaur\nevolution because: 1) they preserve a mosaic of morphological traits that render them useful for interpreting poorly\nknown parts of the dinosaur evolutionary tree; 2) they are from the Early Jurassic, a critical period in early dinosaur\nevolution about which knowledge is scant; and 3) they are the only known Early Jurassic dinosaurs from Antarctica,\nmaking them particularly valuable for understanding patterns of biotic interchange during this time. Recent research\nsuggests that Cryolophosaurus belongs to a geographically widespread clade of mid-sized, Early Jurassic theropods\nwith cranial crests that includes Dilophosaurus wetherilli, ‘Dilophosaurus’ sinensis, and Dracovenator, and renders\nCoelophysoidea sensu lato non-monophyletic. The Antarctic sauropodomorph represents a distinct taxon that is a\nmember of a similarly diverse massospondylid clade. This taxon shares a number of features with more derived\nsauropodomorphs, and provides additional evidence for the paraphyly of Prosauropoda. The phylogenetic relationships\nof the Antarctic dinosaurs are also consistent with a pattern of worldwide faunal homogeneity between Early Jurassic\ncontinental biotas. Furthermore, these analyses support a “ladder-like” arrangement for basal theropod and basal\nsauropodomorph phylogeny, suggesting that these groups passed through “coelophysoid” and “prosauropod” stages of\nmorphological organization early in their respective evolutionary histories.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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The primary focusisto preserve and provide public\naccessto multibeam bathymetry acquired during expeditions of research vesselssupported by the U.S. National Science\nFoundation. Since itsinception in 2003, our primary goal has been to facilitate visualization and exploration of the subsea landscape to the full detail of the original data by both specialists and non-specialists. Visualization across a widerange of map scales at high latitudesis made possible by dynamic accessto a gridded synthesisin both Polar and\nMercator projections. A second goal isto support multi-disciplinary research needs by offering data discovery and\nvisualization of numerous complementary geoscience datasets.In thisreport, we describe the design objectives and\narchitecture of the AMBS, as well asrecent developmentsregarding data submission and delivery via Web Services","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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F.","contributorId":86486,"corporation":false,"usgs":false,"family":"Ryan","given":"William B. F.","affiliations":[{"id":7135,"text":"Lamont Doherty Earth Observatory, Columbia University, Palisades, NY","active":true,"usgs":false}],"preferred":false,"id":487941,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"O’Hara, S.","contributorId":95790,"corporation":false,"usgs":true,"family":"O’Hara","given":"S.","email":"","affiliations":[],"preferred":false,"id":487944,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Arko, R.","contributorId":12771,"corporation":false,"usgs":true,"family":"Arko","given":"R.","email":"","affiliations":[],"preferred":false,"id":487938,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Goodwillie, A.","contributorId":91401,"corporation":false,"usgs":true,"family":"Goodwillie","given":"A.","email":"","affiliations":[],"preferred":false,"id":487943,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Melkonian, A.","contributorId":27352,"corporation":false,"usgs":true,"family":"Melkonian","given":"A.","email":"","affiliations":[],"preferred":false,"id":487940,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Weissel, R.A.","contributorId":103565,"corporation":false,"usgs":true,"family":"Weissel","given":"R.A.","email":"","affiliations":[],"preferred":false,"id":487945,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Ferrini, V.L.","contributorId":26965,"corporation":false,"usgs":true,"family":"Ferrini","given":"V.L.","email":"","affiliations":[],"preferred":false,"id":487939,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}} ,{"id":70065903,"text":"ofr20071047KP10 - 2007 - The significance of Antarctica for studies of global geodynamics","interactions":[],"lastModifiedDate":"2014-01-07T13:21:37","indexId":"ofr20071047KP10","displayToPublicDate":"2007-01-07T13:11:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2007-1047-KP-10","title":"The significance of Antarctica for studies of global geodynamics","docAbstract":"Antarctica has geometric significance for global plate kinematic studies, because it links seafloor spreading systems of \nthe African hemisphere (Indian and Atlantic Oceans) with \nthose of the Pacific. Inferences of plate motions back to 44 \nMa, around the onset of rapid spreading south of Australia \nand formation of a new boundary through New Zealand, are \nconsistent with Antarctic rifting and formation of the Adare \nBasin during 44-26 Ma (i.e., no additional plate motions \nare required in the South Pacific). The time period 52-44 \nMa represents a profound global and South Pacific tectonic \nchange, and significant details remain unresolved. For 74 Ma \na significant nonclosure of the South Pacific plate-motion circuit is identified if Antarctic motion is not included. Alternate \ninferences of motion through Antarctica during the interval \n74-44 Ma imply significantly different subduction volumes \nand directions around the Pacific, and imply different relative \nmotions between hotspots","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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Sediments consist of nearly continuously laminated diatom mud and diatom ooze, with accumulation rates on the order of 20-21 m kyr-1 based on 10 AMS radiocarbon dates. Spectral analysis was performed on time series of opal content, d13Corg, Ti content, and Ba content. Strong decadal to century-\nscale variability is present in all proxies. Opal and Ti-time series show strong variance at periods of 11, 22 and 110-\nyears, which are suggestive of solar forcing. Ba-time series exhibits strong variance at a period of 3-3.6-yr, consistent with possible El Niño-Southern-Oscillation (ENSO) forcing.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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By further \nlinking EANT to both Gondwana and Pangea with relative \nplate circuits, a Synthetic Apparent Polar Wander (SAPW) \npath for EANT is calculated. This path predicts that EANT \nwas located at tropical to subtropical southerly latitudes from \nca. 1 Ga to 420 Ma. Around 400 Ma and again at 320 Ma, \nEANT underwent southward drift. Ca. 250 Ma Antarctica \nvoyaged briefly north but headed south again ca. 200 Ma. \nSince 75 Ma EANT became surrounded by spreading centers \nand has remained extremely stable. Although paleomagnetic \ndata of the blocks that embrace West Antarctica are sparse, \nwe attempt to model their complex kinematics since the \nMesozoic. Together with the SAPW path and a revised \ncircum-Antarctic seafloor spreading history we construct a \nseries of new paleogeographic maps.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. Santa Barbara, California, U.S.A.--August 26 to September 1, 2007","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"National Academies Press","publisherLocation":"Washington, DC","doi":"10.3133/ofr20071047KP11","usgsCitation":"Torsvik, T., Gaina, C., and Redfield, T., 2007, Antarctica and global paleogeography: from Rodinia, rhrough Gondwanaland and Pangea, to the birth of the Southern Ocean and the opening of gateways: U.S. Geological Survey Open-File Report 2007-1047-KP-11, 16 p., https://doi.org/10.3133/ofr20071047KP11.","productDescription":"16 p.","startPage":"125","endPage":"140","costCenters":[],"links":[{"id":280658,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr20071047KP11.JPG"},{"id":280657,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2007/1047/kp/kp11/of2007-1047kp11.pdf"}],"otherGeospatial":"Antarctica","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ 180.0,-90.0 ], [ 180.0,-60.0 ], [ -180.0,-60.0 ], [ -180.0,-90.0 ], [ 180.0,-90.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd4d73e4b0b290850f1830","contributors":{"authors":[{"text":"Torsvik, T.H.","contributorId":59342,"corporation":false,"usgs":true,"family":"Torsvik","given":"T.H.","email":"","affiliations":[],"preferred":false,"id":487932,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Gaina, C.","contributorId":71389,"corporation":false,"usgs":true,"family":"Gaina","given":"C.","email":"","affiliations":[],"preferred":false,"id":487933,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Redfield, T.F.","contributorId":102278,"corporation":false,"usgs":true,"family":"Redfield","given":"T.F.","email":"","affiliations":[],"preferred":false,"id":487934,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70094919,"text":"ofr20071047SRP069 - 2007 - Craddock Massif and Vinson Massif remeasured","interactions":[],"lastModifiedDate":"2014-02-25T11:43:52","indexId":"ofr20071047SRP069","displayToPublicDate":"2007-01-02T11:33:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2007-1047-SRP-069","title":"Craddock Massif and Vinson Massif remeasured","docAbstract":"The highest peak in Antarctica, the Vinson Massif (78º35’S, 85º25’W), is at an elevation of 4892 m (16,046 \nft), as determined in 2004. Measurements of the elevation have fluctuated over the years, from its earliest surveyed \nelevation of 5140 m (16,859 ft), to its present height. Vinson Massif and three of its near neighbors in the Sentinel \nRange of the Ellsworth Mountains are the highest peaks in Antarctica, making them a favorite objective of \nmountaineers. Well over 1,100 people have climbed Vinson since the first ascent by a team in the 1966-67 austral \nsummer. The range is composed of Crashsite quartzite, making the Sentinel’s very resistant to erosion. Very accurate \nelevations have been achieved annually by GPS mapping done by a climbing team sponsored by the Omega \nFoundation, active in Antarctica since 1998. The Craddock Massif now includes Mt. Craddock, the ninth highest peak \nin Antarctica, at 4368 m (14,327 ft). Both are named for Campbell Craddock*, a U.S. geologist active in Antarctic \nresearch beginning in 1959-60.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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Interpretations, based on lithofacies analysis, indicate whether the volcanoes erupted below, near, or \nabove the level of the ice sheet. Our interpretations differ significantly from previous interpretations as they highlight \nthe abundant evidence for ice-volcano interactions at emergent paleoenvironments but limited evidence of higher-than-present syn-eruptive ice-levels. Evidence for subglacial volcanic paleoenvironments is limited to Kennel Peak, a ~8 Ma \nvolcano where a pillow lava sequence extending 25 m above current ice level overlies an inferred glacial till and \nunconformity. A major complication in the Hobbs Coast region is that the volcanism occurred on interfluves between \nregions of fast-flowing ice. Such a setting precludes establishing precise regional paleo-ice-levels although the presence \nor absence of ice at times of eruptions can be inferred.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. Santa Barbara, California, U.S.A.--August 26 to September 1, 2007","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20071047SRP074","usgsCitation":"Wilch, T., and McIntosh, W.C., 2007, Miocene-Pliocene ice-volcano interactions at monogenetic volcanoes near Hobbs Coast, Marie Byrd Land, Antarctica: U.S. Geological Survey Open-File Report 2007-1047-SRP-074, 7 p., https://doi.org/10.3133/ofr20071047SRP074.","productDescription":"7 p.","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":284200,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr20071047SRP074.PNG"},{"id":284199,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2007/1047/srp/srp074/of2007-1047srp074.pdf"}],"otherGeospatial":"Antarctica","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -180.0,-90.0 ], [ -180.0,-60.0 ], [ 180.0,-60.0 ], [ 180.0,-90.0 ], [ -180.0,-90.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd67c6e4b0b29085101995","contributors":{"authors":[{"text":"Wilch, T.I.","contributorId":69881,"corporation":false,"usgs":true,"family":"Wilch","given":"T.I.","email":"","affiliations":[],"preferred":false,"id":491738,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"McIntosh, W. C.","contributorId":68039,"corporation":false,"usgs":true,"family":"McIntosh","given":"W.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":491737,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70094148,"text":"ofr20071047SRP045 - 2007 - Basal Adare volcanics, Robertson Bay, North Victoria Land, Antarctica: Late Miocene intraplate basalts of subaqueous origin","interactions":[],"lastModifiedDate":"2014-02-18T08:54:51","indexId":"ofr20071047SRP045","displayToPublicDate":"2007-01-01T16:12:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2007-1047-SRP-045","title":"Basal Adare volcanics, Robertson Bay, North Victoria Land, Antarctica: Late Miocene intraplate basalts of subaqueous origin","docAbstract":"Late Cenozoic lavas and associated hyaloclastite breccias of the Adare volcanics (Hallett volcanic \nprovince) in Robertson Bay, North Victoria Land rest unconformably on Paleozoic greywackes. Abundant hyaloclastite \nbreccias are confined to a paleovalley; their primary geological features, and the stable isotope ratios of secondary \nminerals, are consistent with eruption in a subaqueous environment with calcite formation probably involving seawater. \nIn contrast, the lavas which stratigraphically overlie the hyaloclastites on Mayr Spur probably were erupted subaerially. \nK-Ar dating of eight samples from this basal sequence confirms the known older age limit (Late Miocene) of the Hallett \nvolcanic province. Geochemical data reveal an ocean island basalt-like affinity, similar to other Cenozoic igneous rocks \nof the Hallett volcanic province. If a submarine eruptive paleoenvironment is accepted then there has been net tectonic \nor isostatic post-Late Miocene uplift of a few hundred metres in the Robertson Bay-Adare Peninsula area","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. Santa Barbara, California, U.S.A.--August 26 to September 1, 2007","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20071047SRP045","usgsCitation":"Mortimer, N., Dunlap, W., Isaac, M., Sutherland, R., and Faure, K., 2007, Basal Adare volcanics, Robertson Bay, North Victoria Land, Antarctica: Late Miocene intraplate basalts of subaqueous origin: U.S. Geological Survey Open-File Report 2007-1047-SRP-045, 7 p., https://doi.org/10.3133/ofr20071047SRP045.","productDescription":"7 p.","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":282456,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr20071047SRP045.JPG"},{"id":282455,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2007/1047/srp/srp045/of2007-1047srp045.pdf"}],"otherGeospatial":"Antarctica","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -180.0,-90.0 ], [ -180.0,-60.0 ], [ 180.0,-60.0 ], [ 180.0,-90.0 ], [ -180.0,-90.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd4ecbe4b0b290850f252b","contributors":{"authors":[{"text":"Mortimer, N.","contributorId":45907,"corporation":false,"usgs":true,"family":"Mortimer","given":"N.","email":"","affiliations":[],"preferred":false,"id":490439,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dunlap, W.J.","contributorId":44833,"corporation":false,"usgs":true,"family":"Dunlap","given":"W.J.","email":"","affiliations":[],"preferred":false,"id":490438,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Isaac, M.J.","contributorId":55336,"corporation":false,"usgs":true,"family":"Isaac","given":"M.J.","email":"","affiliations":[],"preferred":false,"id":490440,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Sutherland, R.P.","contributorId":43272,"corporation":false,"usgs":true,"family":"Sutherland","given":"R.P.","email":"","affiliations":[],"preferred":false,"id":490437,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Faure, K.","contributorId":24687,"corporation":false,"usgs":true,"family":"Faure","given":"K.","email":"","affiliations":[],"preferred":false,"id":490436,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70101011,"text":"ofr20071047SRP092 - 2007 - 40Ar-39Ar Age Constraints on Volcanism and Tectonism in the Terror Rift of the Ross Sea, Antarctica","interactions":[],"lastModifiedDate":"2014-04-09T10:06:48","indexId":"ofr20071047SRP092","displayToPublicDate":"2007-01-01T16:10:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2007-1047-SRP-092","title":"40Ar-39Ar Age Constraints on Volcanism and Tectonism in the Terror Rift of the Ross Sea, Antarctica","docAbstract":"Volcanic sills and dikes inferred from seismic reflection profiles and geophysical studies of the Ross Sea are \nthought to be related to the rift basins in the region, and their emplacement to be coeval with extension. However, lack \nof precise geochronology in the Terror Rift of the Ross Sea region has left these inferred relationships poorly \nconstrained and has hindered neotectonic studies, because of the large temporal gaps between seismic reflectors of \nknown ages. New 40Ar/39Ar geochronology presented here for submarine volcanic rocks provides better age constraints \nfor neotectonic interpretations within the Terror Rift. Several samples from seamounts yielded young ages between 156 \n± 21 and 122 ± 26 Ka. These ages support interpretations that extension within the Terror Rift was active at least \nthrough the Pleistocene. Three evenly spaced samples from the lowermost 100 m of Franklin Island range in age from \n3.28 ± 0.04 to 3.73 ± 0.05 Ma. These age determinations demonstrate that construction of a small volcanic edifice such \nas Franklin Island took at least several hundred thousand years, and therefore that much larger ones in the Erebus \nVolcanic Province are likely to have taken considerably longer than previously inferred. This warrants caution in \napplying a limited number of age determinations to define the absolute ages of events in the Ross Sea region","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. Santa Barbara, California, U.S.A.--August 26 to September 1, 2007","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20071047SRP092","usgsCitation":"U.S. Geological Survey, 2007, 40Ar-39Ar Age Constraints on Volcanism and Tectonism in the Terror Rift of the Ross Sea, Antarctica: U.S. Geological Survey Open-File Report 2007-1047-SRP-092, 4 p., https://doi.org/10.3133/ofr20071047SRP092.","productDescription":"4 p.","onlineOnly":"N","costCenters":[],"links":[{"id":285939,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr20071047SRP092.png"},{"id":285935,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2007/1047/srp/srp092/of2007-1047srp092.pdf"}],"otherGeospatial":"Antarctica","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -180.0,-90.0 ], [ -180.0,-60.0 ], [ 180.0,-60.0 ], [ 180.0,-90.0 ], [ -180.0,-90.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd493ae4b0b290850ef002"} ,{"id":70093631,"text":"ofr20071047SRP041 - 2007 - History of views on the relative positions of Antarctica and South America: A 100-year tango between Patagonia and the Antarctic Peninsula","interactions":[],"lastModifiedDate":"2014-02-11T09:24:31","indexId":"ofr20071047SRP041","displayToPublicDate":"2007-01-01T16:06:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2007-1047-SRP-041","title":"History of views on the relative positions of Antarctica and South America: A 100-year tango between Patagonia and the Antarctic Peninsula","docAbstract":"Discussion of continental drift around Antarctica began nearly 100 years ago. While the Gondwana \nconnections of Antarctica to Africa and Australia have been well defined for decades, the relative pre-drift positions of \nthe Antarctic Peninsula and Patagonia continue to be subjects of controversy. Certainly older figures, which showed a \npaleo-position of the Peninsula crossing over continental crust of the Falkland Plateau or even South Africa or \nPatagonia, are out of consideration now. But contradictory opinions remain over the relative paleo-position of the \nPeninsula as a more or less straight prolongation of the Patagonian Andes, versus a position parallel to Patagonia along \nthe Pacific coast. Geological reasons are found for both opinions, but geophysical observations on the adjacent ocean \nfloors, particularly the evolution of the Weddell Sea crust, speak for the last-mentioned reconstruction.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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The oldest dikes are exposed on Hurd Peninsula (Livingston Island)\nand do not yield 40Ar/39Ar plateaux. Our best estimates suggest dike intrusion at about the Cretaceous/Paleogene boundary.\nAn older age limit for the dikes is established by Campanian nannofossil ages from their metasedimentary host. Dike\nintrusion began earlier and lasted longer on Hurd Peninsula (Danian to Priabonian) than on King George Island (Thanetian\nto Lutetian). Arc magmatism on King George Island, possibly accompanied also by hypabyssal intrusions, began in the\nCretaceous as indicated by ages from the stratiform volcanic sequence. The dikes on King George Island were emplaced\nbeginning in the late Paleocene and ending 47–45 Ma. The youngest arc-related dikes on Hurd Peninsula were emplaced\n~37 Ma","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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One of the common Impletosphaeridium species recovered, I.\nlorum, was previously found in Seymour Island’s La Meseta Formation. Two questions we asked are: “What is the age\nof this high abundance of Impletosphaeridium spp., providing that they come from a unique source?”, and second “What is the environmental significance of such a high relative abundance?” The samples are likely to have been derived from sediments ranging from Eocene to Miocene in age, as this is the range for most of the Impletosphaeridium\nspecies. The environmental significance of this high abundance is a difficult question, not only because the genus is extinct, but also because these species are poorly known. To try to understand the ecological significance, we used the hypothesis that the morphology of a dinocyst is linked to environmental sea-surface parameters, and looked at extant species with a similar morphology. The extant dinoflagellate cysts of Echinidinium spp, Islandinium cezare, Islandinium minutum, and Pentapharsodinium dalei were selected for their morphological similarity with Impletosphaeridium. Modern ecological parameters for the extant species listed above were derived from the DinoDatabase (940 modern sea-surface samples from around the world). The database showed that these species are all\nindicators of sea-ice cover, with a minimum of 8 months for Echinidinium spp., ~ 5 months for Islandinium cezare, and\nfrom 1 to 12 months for Pentapharsodinium dalei and Islandinium minutum. If our morphologic-similarity hypothesis is correct, and if this high abundance is indeed indicative of a paleo-environmental condition, then it is most likely to have been associated with ephemeral sea-ice development off Seymour Island, sometime between the Eocene and the\nMiocene.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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Moraine boulders of \nsedimentary rocks and spore pollen assemblage imply a significant shrinkage of the EAIS, with its margin retreating \nsouth of the Grove Mountains (~450 km south of recent coast line) before the middle Pliocene. The exposure ages \nindicate that the ice sheet subsequently re-advanced, with the ice surface rising locally at least 450 m higher than today. \nIt then went back down constantly from before 2.3 Ma to 1.6 Ma. The glacial topography and existence of soil show \nthat the ice surface fluctuation continued since the early Quaternary, but with highest levels never exceeding ~100 m \nhigher than today.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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Commonly, debris flow units \nare separated by thin deposits of well-stratified facies, interpreted as predominantly glaciomarine mixed contouritic and \ndistal turbidite deposits. These units could act as weak layers and could have played a major role in the slope instability. \nHigh sedimentation rates, due to large amounts of sediment delivered from a temperate, wet-based ice sheet, constituted \na key factor in the sediment failures. The main trigger mechanism would probably have been earthquakes enhanced by \nisostatic rebound following major ice sheet retreats.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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E.","contributorId":91271,"corporation":false,"usgs":false,"family":"O’Brien","given":"P.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":490098,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"De Santis, L.","contributorId":96471,"corporation":false,"usgs":true,"family":"De Santis","given":"L.","email":"","affiliations":[],"preferred":false,"id":490099,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rebesco, M.","contributorId":60120,"corporation":false,"usgs":true,"family":"Rebesco","given":"M.","affiliations":[],"preferred":false,"id":490097,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Brancolini, Giuliano","contributorId":29150,"corporation":false,"usgs":false,"family":"Brancolini","given":"Giuliano","email":"","affiliations":[],"preferred":false,"id":490095,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70094214,"text":"ofr20071047SRP059 - 2007 - The Ross Orogen and Lachlan Fold Belt in Marie Byrd Land, Northern Victoria Land and New Zealand: implication for the tectonic setting of the Lachlan Fold Belt in Antarctica","interactions":[],"lastModifiedDate":"2014-02-18T15:56:40","indexId":"ofr20071047SRP059","displayToPublicDate":"2007-01-01T15:41:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2007-1047-SRP-059","title":"The Ross Orogen and Lachlan Fold Belt in Marie Byrd Land, Northern Victoria Land and New Zealand: implication for the tectonic setting of the Lachlan Fold Belt in Antarctica","docAbstract":"Correlation of the Cambrian Delamerian Orogen of Australia and Ross Orogen of the Transantarctic \nMountains widely accepted but the extension of the adjacent Lachlan Orogen into Antarctica is controversial. Outside \nthe main Ross-Delamerian belt, evidence of this orogeny is preserved at Mt Murphy in Marie Byrd Land and the in \nTakaka Terrane of New Zealand. In all pre-break- configurations of the SW Pacific, these two areas are far removed \nfrom the Ross-Delamerian belt. Evidence from conglomerates in the Takaka Terrane, however, shows that in Late \nCambrian times it was adjacent to the Ross Orogen. This indicates major tectonic displacements within Gondwana after \nthe Cambrian and before break-up. The Lachlan Orogen formed in an extensional belt in a supra-subduction zone \nsetting and the Cambrian rocks of Marie Byrd Land and New Zealand are interpreted as parts of a rifted continental \nribbon on the outboard side of the Lachlan belt.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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This digital catalog is designed primarily \nfor use by micropaleontologists working in the field (at sea or on the Antarctic continent) where hard-copy literature \nresources are limited. This new package will also be useful for classroom/lab teaching as well as for any \npaleontologists making or refining taxonomic identifications at the microscope. The database (Cenozoic Antarctic \nDiatomWare) is displayed via a custom software program (BugCam) written in Visual Basic for use on PCs running \nWindows 95 or later operating systems. BugCam is a flexible image display program that utilizes an intuitive \nthumbnail “tree” structure for navigation through the database. The data are stored on Micrsosoft EXCEL spread \nsheets, hence no separate relational database program is necessary to run the package","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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W.","contributorId":36453,"corporation":false,"usgs":true,"family":"Falcon","given":"W.","email":"","affiliations":[],"preferred":false,"id":488221,"contributorType":{"id":1,"text":"Authors"},"rank":14},{"text":"Lopez, C.","contributorId":63306,"corporation":false,"usgs":true,"family":"Lopez","given":"C.","email":"","affiliations":[],"preferred":false,"id":488225,"contributorType":{"id":1,"text":"Authors"},"rank":15},{"text":"Pressley, T.","contributorId":36051,"corporation":false,"usgs":true,"family":"Pressley","given":"T.","email":"","affiliations":[],"preferred":false,"id":488220,"contributorType":{"id":1,"text":"Authors"},"rank":16},{"text":"Swedberg, O.L.","contributorId":37251,"corporation":false,"usgs":true,"family":"Swedberg","given":"O.L.","email":"","affiliations":[],"preferred":false,"id":488222,"contributorType":{"id":1,"text":"Authors"},"rank":17},{"text":"Harwood, 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imperfect direct record of Antarctic glaciation has led \nto the delayed recognition of the initiation of a continentsized ice sheet. Early studies interpreted initiation in the \nmiddle Miocene (ca 15 Ma). Most current studies place the \nfirst ice sheet in the earliest Oligocene (33.55 Ma), but there \nis physical evidence for glaciation in the Eocene. Though \nthere are inherent limitations in sea-level and deep-sea isotope records, both place constraints on the size and extent \nof Late Cretaceous to Cenozoic Antarctic ice sheets. Sealevel records argue that small- to medium-size (typically \n10-12 × 106\n km3\n) ephemeral ice sheets occurred during the \ngreenhouse world of the Late Cretaceous to middle Eocene. \nDeep-sea δ 18O records show increases associated with \nmany of these greenhouse sea-level falls, consistent with \ntheir attribution to ice-sheet growth. Global cooling began \nin the middle Eocene and culminated with the major earliest Oligocene (33.55 Ma) growth of a large (25 × 106\n km3\n) \nAntarctic ice sheet that caused a 55-70 m eustatic fall and \na 1‰ δ\n18O increase. This large ice sheet became a driver of \nclimate change, not just a response to it, causing increased \nlatitudinal thermal gradients and a spinning up of the oceans \nthat, in turn, caused a dramatic reorganization of ocean circulation and chemistry.","language":"English","publisher":"National Academies Press","publisherLocation":"Washington, DC","doi":"10.3133/ofr20071047KP06","usgsCitation":"Miller, K., Wright, J., Katz, M., Browning, J., Cramer, B., Wade, B., and Mizintseva, S., 2007, A view of Antarctic ice-sheet evolution from sea-level and deep-sea Isotope Changes During the Late Cretaceous-Cenozoic: U.S. Geological Survey Open-File Report 2007-1047-KP-06, 16 p., https://doi.org/10.3133/ofr20071047KP06.","productDescription":"16 p.","startPage":"55","endPage":"70","numberOfPages":"16","costCenters":[],"links":[{"id":280527,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"otherGeospatial":"Antarctica","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ 180.0,-90.0 ], [ 180.0,-60.0 ], [ 180.0,-60.0 ], [ 180.0,-90.0 ], [ 180.0,-90.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd4acae4b0b290850effda","contributors":{"authors":[{"text":"Miller, K.G.","contributorId":18094,"corporation":false,"usgs":true,"family":"Miller","given":"K.G.","email":"","affiliations":[],"preferred":false,"id":487734,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wright, J.D.","contributorId":34676,"corporation":false,"usgs":true,"family":"Wright","given":"J.D.","email":"","affiliations":[],"preferred":false,"id":487737,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Katz, M.E.","contributorId":13776,"corporation":false,"usgs":true,"family":"Katz","given":"M.E.","email":"","affiliations":[],"preferred":false,"id":487733,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Browning, J.V.","contributorId":18889,"corporation":false,"usgs":true,"family":"Browning","given":"J.V.","email":"","affiliations":[],"preferred":false,"id":487735,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Cramer, B.S.","contributorId":32020,"corporation":false,"usgs":true,"family":"Cramer","given":"B.S.","email":"","affiliations":[],"preferred":false,"id":487736,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Wade, B.S.","contributorId":34742,"corporation":false,"usgs":true,"family":"Wade","given":"B.S.","email":"","affiliations":[],"preferred":false,"id":487738,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Mizintseva, S.F.","contributorId":63299,"corporation":false,"usgs":true,"family":"Mizintseva","given":"S.F.","email":"","affiliations":[],"preferred":false,"id":487739,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70101002,"text":"ofr20071047SRP091 - 2007 - Aeromagnetic anomaly patterns reveal buried faults along the eastern margin of the Wilkes Subglacial Basin (East Antarctica)","interactions":[],"lastModifiedDate":"2014-04-08T15:58:51","indexId":"ofr20071047SRP091","displayToPublicDate":"2007-01-01T15:23:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2007-1047-SRP-091","title":"Aeromagnetic anomaly patterns reveal buried faults along the eastern margin of the Wilkes Subglacial Basin (East Antarctica)","docAbstract":"The Wilkes Subglacial Basin (WSB) is the major morphological feature recognized in the hinterland of the \nTransantarctic Mountains. The origin of this basin remains contentious and relatively poorly understood due to the lack \nof extensive geophysical exploration. We present a new aeromagnetic anomaly map over the transition between the \nTransantarctic Mountains and the WSB for an area adjacent to northern Victoria Land. The aeromagnetic map reveals \nthe existence of subglacial faults along the eastern margin of the WSB. These inferred faults connect previously \nproposed fault zones over Oates Land with those mapped along the Ross Sea Coast. Specifically, we suggest a link \nbetween the Matusevich Frature Zone and the Priestley Fault during the Cenozoic. The new evidence for structural \ncontrol on the eastern margin of the WSB implies that a purely flexural origin for the basin is unlikely.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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New multichannel seismic reflection data from inner PIB are \ninterpreted in context of previously published reconstructions for the retreat history in this area since the Last Glacial \nMaximum. Differences in the behavior of the ice sheet during deglaciation are shown to exist for the western and \neastern parts of PIB. While we can identify only a thin veneer of sedimentary deposits in western PIB, eastern PIB \nshows sedimentary layers ≤ 400 msTWT. This is interpreted as a result of differences in ice retreat: a fast ice retreat in \nwestern PIB accompanied by rapid basal melting led to production of large meltwater streams, a slower ice retreat in \neastern PIB is most probably the result of smaller drainage basins resulting in less meltwater production.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. Santa Barbara, California, U.S.A.--August 26 to September 1, 2007","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20071047SRP084","usgsCitation":"Uenzelmann-Neben, G., Gohl, K., Larter, R., and Schluter, P., 2007, Differences in ice retreat across Pine Island Bay, West Antarctica, since the Last Glacial Maximum: Indications from multichannel seismic reflection data: U.S. Geological Survey Open-File Report 2007-1047-SRP-084, Report: 4 p.; Plate 1: 11.69 inches x 8.27 inches; Plate 2: 16.54 inches x 11.69 inches, https://doi.org/10.3133/ofr20071047SRP084.","productDescription":"Report: 4 p.; Plate 1: 11.69 inches x 8.27 inches; Plate 2: 16.54 inches x 11.69 inches","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":285265,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr20071047SRP084.JPG"},{"id":285261,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/2007/1047/srp/srp084/of2007-1047srp084_plate1.pdf"},{"id":285262,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/of/2007/1047/srp/srp084/of2007-1047srp084_plate2.pdf"},{"id":285263,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2007/1047/srp/srp084/of2007-1047srp084.pdf"}],"otherGeospatial":"Antarctica","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -180.0,-90.0 ], [ -180.0,-60.0 ], [ 180.0,-60.0 ], [ 180.0,-90.0 ], [ -180.0,-90.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53559003e4b0120853e8bebe","contributors":{"authors":[{"text":"Uenzelmann-Neben, G.","contributorId":22682,"corporation":false,"usgs":true,"family":"Uenzelmann-Neben","given":"G.","email":"","affiliations":[],"preferred":false,"id":492233,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Gohl, K.","contributorId":53285,"corporation":false,"usgs":true,"family":"Gohl","given":"K.","email":"","affiliations":[],"preferred":false,"id":492234,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Larter, R.D.","contributorId":8765,"corporation":false,"usgs":true,"family":"Larter","given":"R.D.","email":"","affiliations":[],"preferred":false,"id":492232,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Schluter, P.","contributorId":102384,"corporation":false,"usgs":true,"family":"Schluter","given":"P.","email":"","affiliations":[],"preferred":false,"id":492235,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70093622,"text":"ofr20071047SRP039 - 2007 - Early Precambrian mantle derived rocks in the southern Prince Charles Mountains, East Antarctica: age and isotopic constraints","interactions":[],"lastModifiedDate":"2014-02-10T15:30:49","indexId":"ofr20071047SRP039","displayToPublicDate":"2007-01-01T15:17:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2007-1047-SRP-039","title":"Early Precambrian mantle derived rocks in the southern Prince Charles Mountains, East Antarctica: age and isotopic constraints","docAbstract":"Mafic and ultramafic rocks occurring as lenses, boudins, and tectonic slabs within metamorphic units in the \nsouthern Mawson Escarpment display mantle characteristics of either a highly enriched, or highly depleted nature. \nFractionation of these mantle rocks from their sources may be as old as Eoarchaean (ca 3850 Ma) while their tectonic \nemplacement probably occurred prior to 2550 Ma (U-Pb SHRIMP data). These results provide for the first time \nevidence for Archaean suturing within East Antarctica. Similar upper mantle sources are likely present in the northern \nMawson Escarpment. A younger age limit of these rocks is 2200 Ma, as indicated by presumably metamorphic zircon \nages while their magmatic age may be constrained by single zircon dates at 2450-2250 Ma. The area of the northern \nMawson Escarpment is most likely of ensimatic origin and includes mafic rocks which were derived from distinct \nmantle source(s) during Palaeoproterozoic time.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. Santa Barbara, California, U.S.A.--August 26 to September 1, 2007","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20071047SRP039","usgsCitation":"Mikhalsky, E., Henjes-Kunst, F., and Roland, N., 2007, Early Precambrian mantle derived rocks in the southern Prince Charles Mountains, East Antarctica: age and isotopic constraints: U.S. Geological Survey Open-File Report 2007-1047-SRP-039, 4 p., https://doi.org/10.3133/ofr20071047SRP039.","productDescription":"4 p.","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":282233,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr20071047SRP039.JPG"},{"id":282232,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2007/1047/srp/srp039/of2007-1047srp039.pdf"}],"otherGeospatial":"Antarctica","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ 180.0,-90.0 ], [ 180.0,-60.0 ], [ -180.0,-60.0 ], [ -180.0,-90.0 ], [ 180.0,-90.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd5602e4b0b290850f6ab1","contributors":{"authors":[{"text":"Mikhalsky, E.V.","contributorId":44831,"corporation":false,"usgs":true,"family":"Mikhalsky","given":"E.V.","email":"","affiliations":[],"preferred":false,"id":490092,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Henjes-Kunst, F.","contributorId":106409,"corporation":false,"usgs":true,"family":"Henjes-Kunst","given":"F.","email":"","affiliations":[],"preferred":false,"id":490094,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Roland, N.W.","contributorId":60535,"corporation":false,"usgs":true,"family":"Roland","given":"N.W.","email":"","affiliations":[],"preferred":false,"id":490093,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70074776,"text":"ofr20071047SRP033 - 2007 - Jurassic magmatism in Dronning Maud Land: synthesis of results of the MAMOG project","interactions":[],"lastModifiedDate":"2014-02-03T15:34:48","indexId":"ofr20071047SRP033","displayToPublicDate":"2007-01-01T15:13:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2007-1047-SRP-033","title":"Jurassic magmatism in Dronning Maud Land: synthesis of results of the MAMOG project","docAbstract":"The Jurassic Karoo large igneous province (LIP) of Antarctica, and its conjugate margin in southern Africa, \nis critical for investigating important questions about the relationship of basaltic LIPs to mantle plumes. Detailed \naerogeophysical, structural, anisotropy of magnetic susceptibility (AMS), geochronological and geochemical \ninvestigations completed under the British Antarctic Survey’s MAMOG project have provided some of the answers. \nAcross most of the area, magma volumes were small compared to those in southern Africa. Jurassic dikes intruding the \nArchean craton are sparse and the Jutulstraumen trough, a Jurassic rift, is interpreted, from aerogeophysical data, as \nlargely amagmatic. The largest volumes of magma were emplaced along the margin of the craton and close to the \nAfrica-Antarctica rift. Although dikes were emplaced by both vertical and horizontal flow, overwhelmingly magmas in \nDronning Maud Land were locally derived, and not emplaced laterally from distant sources. Basaltic magmatism was \nprotracted in Dronning Maud Land (several dike emplacement episodes between ~206 and 175 Ma), and the small \nmagma volumes resulted in highly diverse magma compositions, including picrites and ferropicrites interpreted to have \nbeen derived from hot mantle in a mantle plume. The protracted magmatism before the locally ~177 Ma flood lava \neruptions, and evidence for a radiating dike swarm, favor a model of mantle plume incubation for 20-30 million years \nbefore flood lava eruption.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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The magnetic anomalies show \ntwo nearly orthogonal major trends. NNW-SSE trending anomalies northeast of Cape Adare represent seafloor \nspreading within the Adare Trough. A connection of these anomalies to the Northern Basin of the Ross Sea is not clear. \nOnshore faults are closely aligned to offshore anomalies. Main trends are NW-SE to NNW-SSE and NE-SW to NNESSW. NNW-SSE oriented dextral-transtensional to extensional faults parallel the Adare Peninsula and Adare Trough \nanomalies. NE-SW trending normal faults appear to segment the main Hallett volcanic bodies.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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Quantitative thermal histories derived from these data consistently indicate onset of slow cooling below 110°C began sometime prior to 300 Ma, and a second stage of rapid cooling from paleotemperatures up to ≤100°C to surface temperatures occurred in the Late Cretaceous – Paleocene. The first cooling phase refers to Carboniferous – Jurassic basement denudation up to 5 km associated with the initial rifting of the Lambert Graben. The presence of the ancient East Antarctic Erosion Surface and rapid Late Cretaceous – Paleocene cooling indicate a second denudational episode during which up to 4.5 km of sedimentary cover rocks were removed, and that is likely linked to the Cretaceous Gondwana breakup between Antarctica and India and subsequent passive continental margin formation.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. 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