The United States Polar Rock Repository: A geological resource for the Earth science community
Annie M. Grunow, David H. Elliot, Julie E. Codispoti
2007, Open-File Report 2007-1047-SRP-068
The United States Polar Rock Repository (USPRR) is a U. S. national facility designed for the permanent curatorial preservation of rock samples, along with associated materials such as field notes, annotated air photos and maps, raw analytic data, paleomagnetic cores, ground rock and mineral residues, thin sections, and microfossil mounts,...
Does the late Pliocene change in the architecture of the Antarctic margin correspond to the transition to the modern Antarctic Ice Sheet?
M. Rebesco, Angelo Camerlenghi
2007, Open-File Report 2007-1047-SRP-021
We observe in 6 key sectors of East and West Antarctica continental margin a change in the geometry of the sedimentary deposits which is characterized by: margin-wide erosion and subsequent progradation on the continental shelf; downlap on the continental slope; major mass wasting deposits on the continental rise. The change occurs in...
Influence of submarine morphology on bottom water flow across the western Ross Sea continental margin
F.J. Davey, S.S. Jacobs
2007, Open-File Report 2007-1047-SRP-067
Multibeam sonar bathymetry documents a lack of significant channels crossing outer continental shelf and slope of the western Ross Sea. This indicates that movement of bottom water across the shelf break into the deep ocean in this area is mainly by laminar or sheet flow. Subtle, ~20 m deep and...
Airborne laser swath mapping of the Denton Hills, Transantarctic Mountains, Antarctica: Applications for structural and glacial geomorphic mapping
Terry Wilson, Beata Csatho
2007, Open-File Report 2007-1047-SRP-089
High-resolution digital elevation data acquired by airborne laser scanning (ALS) for the Denton Hills, along the coastal foothills of the Royal Society Range, Transantarctic Mountains, are examined for applications to bedrock and glacial geomorphic mapping. Digital elevation models (DEMs), displayed as shaded-relief images and slope maps, portray geomorphic landscape features...
Tectonic history of mid-Miocene to present southern Victoria Land Basin, inferred from seismic stratigraphy in McMurdo Sound, Antarctica
S. Henrys, T. Wilson, J.M. Whittaker, C. Fielding, J. Hall, T. Naish
2007, Open-File Report 2007-1047-SRP-049
New and existing seismic reflection data in southern McMurdo Sound have been used to investigate Neogene tectonic history of the Terror Rift adjacent to the Transantarctic Mountains and along the western margin of the West Antarctic Rift System. Seismic data image a young rifting episode that is largely unsampled by CRP...
Occurrence of a young elasmosaurid plesiosaur skeleton from the Late Cretaceous (Maastrichtian) of Antarctica
James E. Martin, J. Foster Sawyer, Marcelo Reguero, Judd A. Case
2007, Open-File Report 2007-1047-SRP-066
The most completely articulated fossil skeleton heretofore found on the continent of Antarctica is represented by a juvenile plesiosaur. The specimen was found in the Sandwich Bluff area of Vega Island east of the Antarctic Peninsula from Late Cretaceous (Maastrichtian) marine deposits from the upper Snow Hill Island Formation. The...
Subglacial conditions at a sticky spot along Kamb Ice Stream, West Antarctica
L.E. Peters, Sridhar Anandakrishnan
2007, Open-File Report 2007-1047-SRP-097
We present the results of a seismic reflection experiment performed transverse to flow a few tens of kilometers above the main trunk of Kamb Ice Stream, West Antarctica, where we image a basal high surrounded by variable subglacial conditions. This high rises as much as 200 m above the surrounding...
The next generation Antarctic digital magnetic anomaly map
Ralph R. B. von Frese, A.V. Golynsky, H.R. Kim, L. Gaya-Pique, E. Thébault, M. Chiappinii, M. Ghidella, A. Grunow, ADMAP Working Group
2007, Open-File Report 2007-1047-SRP-093
Initiated in 1995, the Antarctic Digital Magnetic Anomaly Project (ADMAP) produced the first magnetic anomaly map of the Antarctic region south of 60 o S (Golynsky et al., 2001). This map synthesized over 7.1 million line-kms of survey data available up through 1999 from marine, airborne and Magsat satellite observations. Since the...
The "Golden Shale": An indicator of coastal stability for Marble Point, McMurdo Sound, over the last four million years
G.G.C. Claridge, I.B. Campbell
2007, Open-File Report 2007-1047-SRP-087
A small sedimentary deposit near Gneiss Point on the western side of McMurdo Sound, previously identified as shale, is described. The deposit is phillipsite, a zeolite that is believed to have formed from the deposition and alteration of volcanic ash in a small ice-marginal saline lake. Other previously recorded occurrences...
Aeromagnetic search for Cenozoic magmatism over the Admiralty Mountains Block (East Antarctica)
Armadillo, E., Fausto Ferraccioli, A. Zunino, E. Bozzo, S. Rocchi, P. Armienti
2007, Open-File Report 2007-1047-SRP-075
Cenozoic magmatic rocks of the Transantarctic Mountains provide an important window on the tectonic and magmatic processes of the West Antarctic Rift System. Previous aeromagnetic investigations in northern Victoria Land have delineated Cenozoic volcanic and intrusive complexes assigned to the McMurdo Volcanic Group and Meander Intrusives over the Transantarctic Mountains....
Pan-African granulites of central Dronning Maud Land and Mozambique: A comparison within the East-African-Antarctic orogen
A.K. Engvik, S. Elevevold, J. Jacobs, E. Tveten, S. de Azevedo, F. Njange
2007, Open-File Report 2007-1047-SRP-065
Granulite-facies metamorphism is extensively reported in Late Neoproterozoic/Early Palaeozoic time during formation of the East-African-Antarctic orogen (EAAO). Metamorphic data acquired from the Pan-African orogen of central Dronning Maud Land (cDML) are compared with data from northern Mozambique. The metamorphic rocks of cDML are characterised by Opx±Grt-bearing gneisses and Sil+Kfs-bearing metapelites...
East Antarctic ice-sheet dynamics between 5.2 and 0 Ma from a high-resolution terrigenous particle size record, ODP Site 1165, Prydz Bay-Cooperation Sea
S. Passchier
2007, Open-File Report 2007-1047-SRP-043
This paper discusses a 5.2-0 Ma high-resolution terrigenous particle size record recovered from a sediment drift off East Antarctica. The particle size properties of Hole 1165B are interpreted in the context of previously acquired data on a continental shelf to slope transect drilled by ODP Leg 188 in Prydz Bay...
Geology of the Terre Adélie Craton (135 – 146˚ E)
R.P. Menot, G. Duclaux, J.J. Peucat, Y. Rolland, S. Guillot, M. Fanning, J. Bascou, D. Gapais, A. Pecher
2007, Open-File Report 2007-1047-SRP-048
More than 15 years of field and laboratory investigations on samples from Terre Adélie to the western part of George Vth Land (135 to 146°E) during the GEOLETA program allow a reassessment of the Terre Adélie Craton (TAC) geology. The TAC represents the largest exposed fragment of the East Antarctic...
Analysis of continuous GPS measurements from southern Victoria Land, Antarctica
Michael J. Willis
2007, Open-File Report 2007-1047-SRP-064
Several years of continuous data have been collected at remote bedrock Global Positioning System (GPS) sites in southern Victoria Land, Antarctica. Annual to sub-annual variations are observed in the position time-series. An atmospheric pressure loading (APL) effect is calculated from pressure field anomalies supplied by the European Centre for Medium-Range...
Active tectonics on Deception Island (West-Antarctica): A new approach by using the fractal anisotropy of lineaments, fault slip measurements and the caldera collapse shape
R. Perez-Lopez, J. L. Giner-Robles, J.J. Martinez-Diaz, M.A. Rodriguez-Pascua, M. Bejar, C. Paredes, J.M. Gonzalez-Casado
2007, Open-File Report 2007-1047-SRP-086
The tectonic field on Deception Island (South Shetlands, West Antarctica) is determined from structural and fractal analyses. Three different analyses are applied to the study of the strain and stress fields in the area: (1) field measurements of faults (strain analysis), (2) fractal geometry of the spatial distribution of lineaments...
The history of Antarctic Peninsula glaciation
Peter F. Barker
2007, Open-File Report 2007-1047-SRP-042
As Co-Chief Scientist on DSDP Leg 35 in 1974, Cam Craddock (1930-2006) produced the first useful information on Cenozoic Antarctic Peninsula glaciation - an early middle Miocene (15-17 Ma) apparent glacial onset. Subsequent work, onshore and offshore, has greatly extended our knowledge but that early conclusion stands today. Cenozoic Antarctic...
Trends in discharge and flow season timing of the Onyx River, Wright Valley, Antarctica since 1969
Michael N. Gooseff, Diane M. McKnight, Peter T. Doran, W. Berry Lyons
2007, Open-File Report 2007-1047-SRP-088
Flow records at the two stream gauges on the Onyx River represent the longest actively collected environmental records in the McMurdo Dry Valleys, Antarctica. The downstream gauge, near Lake Vanda, has been collecting data since 1969, and the upstream gauge, at Lower Wright Glacier (LWRT), has collected data since 1972....
Geophysical survey reveals tectonic structures in the Amundsen Sea embayment, West Antarctica
K. Gohl, G. Eagles, G. Netzeband, J.W.G. Grobys, N. Parsiegla, P. Schluter, V. Leinweber, R.D. Larter, G. Uenzelmann-Neben, G.B. Udintsev
2007, Open-File Report 2007-1047-SRP-047
The Amundsen Sea embayment of West Antarctica is in a prominent location for a series of tectonic and magmatic events from Paleozoic to Cenozoic times. Seismic, magnetic and gravity data from the embayment and Pine Island Bay (PIB) reveal the crustal thickness and some tectonic features. The Moho is 24-22 km...
Geometrical analysis of structural data collected at high South latitude: A modular arithmetic method that addresses meridional convergence
C.S. Siddoway, M.F. Siddoway
2007, Open-File Report 2007-1047-SRP-061
The convergence of meridians toward the South Pole causes unique problems for geometrical comparison of structural geological and geophysical datasets from Antarctica. The true North reference direction ordinarily is used for measuring and reporting vector data (strike, trend) in Antarctica, as elsewhere. However, over a latitude distance of just 100...
Cretaceous oblique detachment tectonics in the Fosdick Mountains, Marie Byrd Land, Antarctica
R. McFadden, C.S. Siddoway, C. Teyssier, C.M. Fanning, S.C. Kruckenberg
2007, Open-File Report 2007-1047-SRP-046
The Fosdick Mountains form an E-W trending migmatite dome in the northern Ford Ranges of Marie Byrd Land, Antarctica. Pervasively folded migmatites derived from lower Paleozoic greywacke and middle Paleozoic plutonic rocks constitute the dome. New field research documents a transition from melt-present to solid-state deformation across the south flank...
Vertical motions in Northern Victoria Land inferred from GPS: A comparison with a glacial isostatic adjustment model
F. Mancini, M. Negusini, A. Zanutta, A. Capra
2007, Open-File Report 2007-1047-SRP-073
Following the densification of GPS permanent and episodic trackers in Antarctica, geodetic observations are playing an increasing role in geodynamics research and the study of the glacial isostatic adjustment (GIA). The improvement in geodetic measurements accuracy suggests their use in constraining GIA models. It is essential to have a deeper...
Evaluating the potential for watershed restoration to reduce nutrient loading to Upper Klamath Lake, Oregon
Paul V. McCormick, Sharon G. Campbell
2007, Open-File Report 2007-1168
A literature review of best management practices to reduce nutrient loading was performed to provide information for resource managers in the Klamath Basin, Oregon. Although BMPs have already been implemented in the watershed, some sense of their effectiveness in reducing phosphorus loading and their cost for installation and maintenance is...
Applying radar technology to migratory bird conservation and management: Strengthening and expanding a collaborative
Janet M. Ruth, Albert Manville, Ron Larkin, Wylie C. Barrow, Lori Johnson-Randall, Deanna K. Dawson, Robert H. Diehl, Yufang Wang, Richard S. Sojda, Rafal Angryk, Robert W. Klaver, Reggie Mead, John Paxton, Patricia J. Heglund, Eileen Kirsch, Manuel J. Suarez, Larry Robinson, Sidney A. Gauthreaux Jr., Carroll G. Belser, Steven J. Franke, Bruno Bruderer, Jeffrey J. Buler, Frank R. Moore, David S. Mizrahi, Robert Fogg, T. Adam Kelly, Paul M. Cryan, Tim Crum, Terry J. Schuur, Dave Krueper, Robb Diehl, Tom Will
Janet M. Ruth, editor(s)
2007, Open-File Report 2007-1361
Executive Summary Understanding the factors affecting migratory bird and bat populations during all three phases of their life cycle—breeding, nonbreeding, and migration—is critical to species conservation planning. This includes the need for information about these species’ responses to natural challenges, as well as information about the effects of human activities and...
Fort Collins Science Center: 2006 Accomplishments
Juliette T. Wilson, editor(s)
2007, Open-File Report 2007-1154
In Fiscal Year 2006 (FY06), the U.S. Geological Survey (USGS) Fort Collins Science Center (FORT) continued research vital to U.S. Department of the Interior (DOI) science and management needs and associated USGS programmatic goals. FORT work also supported the science needs of other governmental departments and agencies as well as...
Aerial population estimates of wild horses (Equus caballus) in the adobe town and salt wells creek herd management areas using an integrated simultaneous double-count and sightability bias correction technique
Bruce C. Lubow, Jason I. Ransom
2007, Open-File Report 2007-1274
An aerial survey technique combining simultaneous double-count and sightability bias correction methodologies was used to estimate the population of wild horses inhabiting Adobe Town and Salt Wells Creek Herd Management Areas, Wyoming. Based on 5 surveys over 4 years, we conclude that the technique produced estimates consistent with the known...
