Modeling environmental bias and computing velocity field from data of Terra Nova Bay GPS network in Antarctica by means of a quasi-observation processing approach
Giuseppe Casula, Marco Dubbini, Angelo Galeandro
2007, Open-File Report 2007-1047-SRP-054
A semi-permanent GPS network of about 30 vertices has been installed at Terra Nova Bay (TNB) near Ross Sea in Antarctica. A permanent GPS station TNB1 based on an Ashtech Z-XII dual frequency P-code GPS receiver with ASH700936D_M Choke Ring Antenna has been mounted on a reinforced concrete pillar built...
Thermochronologic constraints on the tectonic evolution of the western Antarctic Peninsula in late Mesozoic and Cenozoic times
M.R. Brix, V. Faundez, F. Herve, M. Solari, J. Fernandez, A. Carter, B. Stockhert
2007, Open-File Report 2007-1047-SRP-101
West of the Antarctic Peninsula, oceanic lithosphere of the Phoenix plate has been subducted below the Antarctic plate. Subduction has ceased successively from south to north over the last 65 Myr. An influence of this evolution on the segmentation of the crust in the Antarctic plate is disputed. Opposing scenarios...
Crustal architecture of the oblique-slip conjugate margins of George V Land and southeast Australia
H.M.J. Stagg, A.M. Reading
2007, Open-File Report 2007-1047-SRP-109
A conceptual, lithospheric-scale cross-section of the conjugate, oblique-slip margins of George V Land, East Antarctica, and southeast Australia (Otway Basin) has been constructed based on the integration of seismic and sample data. This cross-section is characterised by asymmetry in width and thickness, and depth-dependent crustal extension at breakup in the...
Thermochronologic constraints on Jurassic rift flank denudation in the Thiel Mountains, Antarctica
P.G. Fitzgerald, S.L. Baldwin
2007, Open-File Report 2007-1047-SRP-044
The Thiel Mountains are part of the Transantarctic Mountains (TAM) and occupy a strategic position close to the East-West Antarctic boundary. They occur in a region of relatively subdued topography distal from high topography and high relief of most of the TAM adjacent to the West Antarctic rift system. Low-temperature...
Abrupt turnover in calcareous-nannoplankton assemblages across the Paleocene/Eocene Thermal Maximum: implications for surface-water oligotrophy over the Kerguelen Plateau, Southern Indian Ocean
Shijun Jiang, Sherwood W. Wise Jr.
2007, Open-File Report 2007-1047-SRP-024
Ocean Drilling Program (ODP) Core Section 183-1135A-25R-4 from the Kerguelen Plateau in the Indian Ocean sector of the Southern Ocean represents only the second complete, expanded sequence through the Paleocene/Eocene Thermal Maximum (PETM; ~55 Ma) recovered from Antarctic waters. Calcareous nannoplankton at this site underwent an abrupt, fundamental turnover across...
Granulometry of pebble beach ridges in Fort Williams Point, Greenwich Island, Antarctic Peninsula; a possible result from Holocene climate fluctuations
E. Santana, J.F. Dumont
2007, Open-File Report 2007-1047-SRP-027
We present a granulometric study of emerged pebble beach ridges in the Fort Williams Point, Greenwich Island, Antarctic Peninsula. We studied 8 beach ridges from the shore up to 13.5 m above current sea level. The beach ridges are made of volcanic material from the surrounding relief, but also include...
Major magmatic events in Mt Meredith, Prince Charles Mountains: First evidence for early Palaeozoic syntectonic granites
N.A. Gongurov, A.A. Laiba, B.V. Beliatsky
2007, Open-File Report 2007-1047-SRP-100
Precambrian rocks at Mt Meredith underwent granulite-facies metamorphism M1. Zircon isotope dating for two orthogneisses revealed the following age signatures: 1294±3 and 957±4Ma; 1105±5 and 887±2Ma. The oldest ages could reflect the time of orthogneiss protolith crystallization and the latest age determinations date Grenvillian metamorphism. The metamorphic rocks were intruded...
Cartographic production for the Florida Shelf Habitat (FLaSH) map study: generation of surface grids, contours, and KMZ files
Lisa L. Robbins, Mark Hansen, Ellen Raabe, Paul O. Knorr, Joseph Browne
2007, Open-File Report 2007-1397
The Florida shelf represents a finite source of economic resources, including commercial and recreational fisheries, tourism, recreation, sand and gravel resources, phosphate, and freshwater reserves. Yet the basic information needed to locate resources, or to interpret and utilize existing data, comes from many sources, dates, and formats. A multi-agency effort...
Structure of the central Terror Rift, western Ross Sea, Antarctica
Jerome Hall, Terry Wilson, Stuart Henrys
2007, Open-File Report 2007-1047-SRP-108
The Terror Rift is a zone of post-middle Miocene faulting and volcanism along the western margin of the West Antarctic Rift System. A new seismic data set from NSF geophysical cruise NBP04-01, integrated with the previous dataset to provide higher spatial resolution, has been interpreted in this study in order...
Seismic facies and stratigraphy of the Cenozoic succession in McMurdo Sound, Antarctica: Implications for tectonic, climatic and glacial history
C.R. Fielding, J. Whittaker, S.A. Henrys, T. J. Wilson, T.R. Nash
2007, Open-File Report 2007-1047-SRP-090
A new stratigraphic model is presented for the evolution of the Cenozoic Victoria Land Basin of the West Antarctic Rift, based on integration of seismic reflection and drilling data. The Early Rift phase (?latest Eocene to Early Oligocene) comprises wedges of strata confined by early extensional faults, and which contain...
Basement and crustal structure of the Davis Sea region (East Antarctica): implications for tectonic setting and continent to oceanic boundary definition
Y.B. Guseva, G.L. Leitchenkov, V.V. Gandyukhin, S.V. Ivanov
2007, Open-File Report 2007-1047-SRP-025
This study is based on about 8400 km of MCS, magnetic and gravity data as well as 20 sonobuoys collected by the Russian Antarctic Expedition during 2003 and 2004 in the Davis Sea and adjacent areas between 80°E and 102°E. Major tectonic provinces and features are identified and mapped in...
Microstructural study of natural fractures in Cape Roberts Project 3 core, Western Ross Sea, Antarctica
C. Millan, T. Wilson, T. Paulsen
2007, Open-File Report 2007-1047-SRP-053
Microstructures in natural fractures in core recovered offshore from Cape Roberts, Ross Sea, Antarctica, provide new constraints on the relative timing of faulting and sedimentation in the Victoria Land Basin along the Transantarctic Mountain rift flank. This study characterizes the textures, fabrics and grain-scale structures from thin section analysis of...
Metamorphic conditions during formation of a metapelitic sillimanite-garnet gneiss from Clemence Massif, Prince Charles Mountains, East Antarctica
A.F. Corvino, S.D. Boger, C.J.L. Wilson
2007, Open-File Report 2007-1047-SRP-062
The pressure (P) and temperature (T) conditions during metamorphism of a metapelitic sillimanite-garnet gneiss from Clemence Massif, Antarctic Prince Charles Mountains, are estimated using mineral abundance information and petrogenetic P–T pseudosections computed in the chemical system MnO–N2O–CaO–K2O–FeO–MgO–Al2O3– SiO2–H2O–TiO2–Fe2O3 (MnNCKFMASHTO). Calculated mineral equilibria for the appropriate bulk composition predict that the observed...
The contribution of geomagnetic observatories and magnetic models to the study of secular variation and jerks in Antarctica
A. Meloni, L. Cafarella, P. De Michelis, R. Tozzi
2007, Open-File Report 2007-1047-SRP-071
Some of the most interesting features of the geomagnetic field and its time variations are displayed in polar areas. Observatory monthly means usually provide an excellent opportunity to study the temporal changes of the magnetic field at a given location. Unfortunately, on the Antarctic continent the distribution of the permanent ground- based observatories...
Tectonics of the West Antarctic rift system: new light on the history and dynamics of distributed intracontinental extension
C.S. Siddoway
2007, Open-File Report 2007-1047-KP-09
The West Antarctic rift system (WARS) is the product of multiple stages of intracontinental deformation from Jurassic to Present. The Cretaceous rifting phase accomplished >100 percent extension across the Ross Sea and central West Antarctica, and is widely perceived as a product of pure shear extension orthogonal to the Transantarctic...
Seismic and chronostratigraphic results from SHALDRIL II, northwestern Weddell Sea
J.B. Anderson, J. Wellner, S. Wise, S. Bohaty, P. Manley, T. Smith, F. Weaver, D. Kulhanek
2007, Open-File Report 2007-1047-SRP-094
The 2006 SHALDRIL II cruise was conducted in the northwestern Weddell Sea, with primary drilling targets in the James Ross Basin. A site drilled along the northern edge of the James Ross Basin sampled either latest Eocene or earliest Oligocene deposits, providing a lower chronostratigraphic benchmark for our seismic stratigraphic...
Regional seismic stratigraphic correlations of the Ross Sea: Implications for the tectonic history of the West Antarctic Rift System
Robert C. Decesari, Christopher C. Sorlien, Bruce P. Luyendyk, Douglas S. Wilson, Louis Bartek, John Diebold, Sarah E. Hopkins
2007, Open-File Report 2007-1047-SRP-052
Using existing and new seismic reflection data, new and updated correlations of late Oligocene-early Miocene RSS-2 strata were made between the southern parts of Ross Sea basins. Previous studies documented Cretaceous extension across much of Ross Sea. We interpret that Cenozoic extension also occurred across Ross Sea. Subsidence during and...
Organic carbon stocks in permafrost-affected soils from Admiralty Bay, Antarctica
F.N.B. Simas, C.E.G.R. Schaefer, E.S. Mendonca, I.R. Silva, R.M. Santana, A.S.S. Ribeiro
2007, Open-File Report 2007-1047-SRP-076
Recent works show that organic matter accumulation in some soils from coastal Antarctica is higher than previously expected. The objective of the present work was to estimate the organic C stocks for soils from maritime Antarctica. Cryosols from subpolar desert landscapes presented the lowest organic C stocks. Ornithogenic soils are...
Review of the geology and paleontology of the Ellsworth Mountains, Antarctica
G.F. Webers, J.F. Splettstoesser
2007, Open-File Report 2007-1047-SRP-107
The geology of the Ellsworth Mountains has become known in detail only within the past 40-45 years, and the wealth of paleontologic information within the past 25 years. The mountains are an anomaly, structurally speaking, occurring at right angles to the Transantarctic Mountains, implying a crustal plate rotation to reach...
Global polar geospatial information service retrieval based on search engine and ontology reasoning
Nengcheng Chen, Dongcheng E, Liping Di, Jianya Gong, Zeqiang Chen
2007, Open-File Report 2007-1047-SRP-099
In order to improve the access precision of polar geospatial information service on web, a new methodology for retrieving global spatial information services based on geospatial service search and ontology reasoning is proposed, the geospatial service search is implemented to find the coarse service from web, the ontology reasoning is...
Permafrost and active layer monitoring in the maritime Antarctic: Preliminary results from CALM sites on Livingston and Deception Islands
M. Ramos, G. Vieira, J.J. Blanco, C. Hauck, M.A. Hidalgo, D. Tome, M. Nevers, A. Trindade
2007, Open-File Report 2007-1047-SRP-070
This paper describes results obtained from scientific work and experiments performed on Livingston and Deception Islands. Located in the South Shetland Archipelago, these islands have been some of the most sensitive regions over the last 50 years with respect to climate change with a Mean Annual Air Temperature (MAAT) close...
A pan-Precambrian link between deglaciation and environmental oxidation
T.J. Raub, J.L. Kirschvink
2007, Open-File Report 2007-1047-KP-08
Despite a continuous increase in solar luminosity to the present, Earth’s glacial record appears to become more frequent, though less severe, over geological time. At least two of the three major Precambrian glacial intervals were exceptionally intense, with solid evidence for widespread sea ice on or near the equator, well...
Jurassic silicic volcanism in the Transantarctic Mountains: Was it related to plate margin processes or to Ferrar magmatism?
D.H. Elliot, T.H. Fleming, K.A. Foland, C.M. Fanning
2007, Open-File Report 2007-1047-SRP-051
Silicic volcanism in the Transantarctic Mountains, represented by rhyolitic tuff that mainly precedes emplacement of the Ferrar Large Igneous Province, is important in interpretation of the tectonic evolution of the Antarctic sector of Gondwana. Sr and Nd isotope data indicate that the tuffs are not directly related to Ferrar magmatism...
Cretaceous and Tertiary extension throughout the Ross Sea, Antarctica
Robert C. Decesari, Douglas C. Wilson, Bruce P. Luyendyk, Michael Faulkner
2007, Open-File Report 2007-1047-SRP-098
Marine geophysical data from the deep sea adjacent to the Ross Sea, Antarctica suggest that 70 km of extension occurred between East and West Antarctica from 46 to 2 Ma. The Northern and Victoria Land Basins in the western Ross Sea adjacent to the Transantarctic Mountains accommodated 95 km of...
New magnetic anomaly map of East Antarctica and surrounding regions
A. Golynsky, D. Blankenship, Massimo Chiappini, D. Damaske, Fausto Ferraccioli, C. Finn, D. Golynsky, A. Goncharov, T. Ishihara, S. Ivanov, W. Jokat, H.R. Kim, M. Konig, Valery Masolov, Y. Nogi, M. Sand, M. Studing, ADMAP Working Group
2007, Open-File Report 2007-1047-SRP-050
More than 500,000 line-km of new airborne and shipborne data, recently acquired by the international community over East Antarctica and surrounding regions, significantly upgrade the Antarctic Digital Magnetic Anomaly Project (ADMAP) compilation and lead to substantial improvements in magnetic anomaly pattern recognition. New data have been matched in one inverse operation...
