Jurassic magmatism in Dronning Maud Land: synthesis of results of the MAMOG project
P.T. Leat, M.L. Curtis, T.R. Riley, Fausto Ferraccioli
2007, Open-File Report 2007-1047-SRP-033
The Jurassic Karoo large igneous province (LIP) of Antarctica, and its conjugate margin in southern Africa, is critical for investigating important questions about the relationship of basaltic LIPs to mantle plumes. Detailed aerogeophysical, structural, anisotropy of magnetic susceptibility (AMS), geochronological and geochemical investigations completed under the British Antarctic Survey’s MAMOG...
The Pan-African nappe tectonics in the Shackleton Range
W. Buggisch, Georg Kleinschmidt
2007, Open-File Report 2007-1047-SRP-58
In memory of Campbell Craddock: When J. Campbell Craddock (1972) published his famous 1:5 000 000 map of the Geology of Antarctica, he established major units such as the East Antarctic Craton, the early Palaeozoic Ross, the Mesozoic Ellsworth, and the Cenozoic Andean orogens. It is already evident from this...
Unconsolidated sediments at the bottom of Lake Vostok from seismic data
I. Filina, V. Lukin, Valery Masolov, D. Blankenship
2007, Open-File Report 2007-1047-SRP-031
Seismic soundings of Lake Vostok have been performed by the Polar Marine Geological Research Expedition in collaboration with the Russian Antarctic Expedition since the early 1990s. The seismograms recorded show at least two relatively closely spaced reflections associated with the lake bottom. These were initially interpreted as boundaries of a...
Morphotectonic architecture of the Transantarctic Mountains rift flank between the Royal Society Range and the Churchill Mountains based on geomorphic analysis
Elizabeth Demyanick, Terry J. Wilson
2007, Open-File Report 2007-1047-SRP-096
Extensional forces within the Antarctic Plate have produced the Transantarctic Mountains rift-flank uplift along the West Antarctic rift margin. Large-scale linear morphologic features within the mountains are controlled by bedrock structure and can be recognized and mapped from satellite imagery and digital elevation models (DEMs). This study employed the Antarctic...
Airborne geophysics as a tool for geoscientific research in Antarctica: some recent examples
Fausto Ferraccioli, P.C. Jones, P. Leat, T.A. Jordan
2007, Open-File Report 2007-1047-SRP-056
The polar regions play an important role in Earth's geodynamic and climatic systems. Modern airborne geophysical surveys combine radio-echo sounding, aeromagnetic and aerogravity methods to explore the geology of these regions. This paper reviews some recent aerogeophysical investigations undertaken by the British Antarctic Survey to: 1) Image subglacial rifts of Jurassic age in...
Upper mantle anisotropy from teleseismic SKS splitting beneath Lützow-Holm Bay Region, East Antarctica
Y. Usui, M. Kanao, A. Kubo, Y. Hiramatsu, H. Negishi
2007, Open-File Report 2007-1047-SRP-013
Investigations of SKS wave splitting of teleseismic events from digital seismographs recorded at eight stations around the Lützow-Holm Bay Region have lead to understanding the evolution of the Antarctic Plate. The observed delay times of SKS splitting are up to 1.3 s, which are generally equal to the global average....
The Black Mountain tectonic zone--a reactivated northeast-trending crustal shear zone in the Yukon-Tanana Upland of east-central Alaska: Chapter D in Recent U.S. Geological Survey studies in the Tintina Gold Province, Alaska, United States, and Yukon, Canada--results of a 5-year project
J. Michael O’Neill, Warren C. Day, John N. Alienikoff, Richard W. Saltus
Larry P. Gough, Warren C. Day, editor(s)
2007, Scientific Investigations Report 2007-5289-D
The Black Mountain tectonic zone in the YukonTanana terrane of east-central Alaska is a belt of diverse northeast-trending geologic features that can been traced across Black Mountain in the southeast corner of the Big Delta 1°×3° degree quadrangle. Geologic mapping in the larger scale B1 quadrangle of the Big Delta...
Break-up of Gondwana and opening of the South Atlantic: Review of existing plate tectonic models
M.E. Ghidella, L.A. Lawver, L.M. Gahagan
2007, Open-File Report 2007-1047-SRP-055
The opening history of both the Weddell Sea and South Atlantic Ocean is critical to understanding the break- up of Gondwana and the evolution of Antarctica since Early Jurassic times. The dispersal of the Gondwanide fragments is important to understanding the development of past ocean circulation. Unfortunately the tectonics of the Weddell...
Sea ice concentration temporal variability over the Weddell Sea and its relationship with tropical sea surface temperature
S. Barreira, R. Compagnucci
2007, Open-File Report 2007-1047-SRP-029
Principal Components Analysis (PCA) in S-Mode (correlation between temporal series) was performed on sea ice monthly anomalies, in order to investigate which are the main temporal patterns, where are the homogenous areas located and how are they related to the sea surface temperature (SST). This analysis provides 9 patterns (4...
Triassic-Jurassic sediments and multiple volcanic events in North Victoria Land, Antarctica: A revised stratigraphic model
R. Schoner, L. Viereck-Goette, J. Schneider, B. Bomfleur
2007, Open-File Report 2007-1047-SRP-102
Field investigations in North Victoria Land, Antarctica during GANOVEX IX (2005/2006) allow the revision of the Triassic-Jurassic stratigraphy of ~300 m thick continental deposits in between the crystalline basement and the Kirkpatrick lava flows of the Ferrar Group. The lower stratigraphic unit (Section Peak Formation) is characterised by braided river-type...
East Antarctic Ice Sheet fluctuations during the Middle Miocene Climatic Transition inferred from faunal and biogeochemical data on planktonic foraminifera (ODP Hole 747A, Kerguelen Plateau)
M. Verducci, L.M. Foresi, G.H. Scott, Tiepolo, M. Sprovieri, F. Lirer
2007, Open-File Report 2007-1047-SRP-037
This research focuses on a detailed study of faunal and biogeochemical changes that occurred at ODP Hole 747A in the Kerguelen Plateau region of the Southern Ocean during the middle Miocene (14.8-11.8 Ma). Abundance fluctuations of several planktonic foraminiferal taxa, stable oxygen isotope and Mg/Ca ratios have been integrated as...
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...
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...
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...
Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2006
Charles C. Schwartz, Mark A. Haroldson, Karrie K. West, editor(s)
2007, Report
The contents of this Annual Report summarize results of monitoring and research from the 2006 field season. The report also contains a summary of nuisance grizzly bear (Ursus arctos horribilis) management actions. The Interagency Grizzly Bear Study Team (IGBST) continues to work on issues associated with counts of unduplicated females with...
USGS Tampa Bay Pilot Study
K. K. Yates, T. M. Cronin, M. Crane, M. Hansen, A. Nayeghandi, P. Swarzenski, T. Edgar, G. R. Brooks, B. Suthard, A. Hine, S. Locker, Debra A. Willard, D. Hastings, B. Flower, D. Hollander, R.A. Larson, K. Smith
2007, Report, Baywide Environmental Monitoring Report, 2002-2005
Many of the nation's estuaries have been environmentally stressed since the turn of the 20th century and will continue to be impacted in the future. Tampa Bay, one the Gulf of Mexico's largest estuaries, exemplifies the threats that our estuaries face (EPA Report 2001, Tampa Bay Estuary Program-Comprehensive Conservation and...
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...
Triggering mechanism and tsunamogenic potential of the Cape Fear Slide complex, U.S. Atlantic margin
Matthew J. Hornbach, Luc L. Lavier, Carolyn D. Ruppel
2007, Geochemistry, Geophysics, Geosystems (8)
Analysis of new multibeam bathymetry data and seismic Chirp data acquired over the Cape Fear Slide complex on the U.S. Atlantic margin suggests that at least 5 major submarine slides have likely occurred there within the past 30,000 years, indicating that repetitive, large-scale mass wasting and associated tsunamis may be...
Time, space, and composition relations among northern Nevada intrusive rocks and their metallogenic implications
E. A. duBray
2007, Geosphere (3) 381-405
Northern Nevada contains ∼360 igneous intrusions subequally distributed among three age groups: middle Tertiary, Cretaceous, and Jurassic. These intrusions are dominantly granodiorite and monzogranite, although some are more mafic. Major-oxide and trace-element compositions of intrusion age groups are remarkably similar, forming compositional arrays that are continuous, overlapping, and essentially indistinguishable....
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...
GIS data for the Seaside, Oregon, Tsunami Pilot Study to modernize FEMA flood hazard maps
Florence L. Wong, Angie J. Venturato, Eric L. Geist
2007, Conference Paper, Proceedings of Coastal Zone '07
A Tsunami Pilot Study was conducted for the area surrounding the coastal town of Seaside, Oregon, as part of the Federal Emergency Management's (FEMA) Flood Insurance Rate Map Modernization Program (Tsunami Pilot Study Working Group, 2006). The Cascadia subduction zone extends from Cape Mendocino, California, to Vancouver Island, Canada. The...
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...
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...
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...
