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...
Geology of the Byrd Glacier Discontinuity (Ross Orogen): New survey data from the Britannia Range, Antarctica
R. Carosi, F. Giacomini, F. Talarico, E. Stump
2007, Open-File Report 2007-1047-SRP-030
Field activities in the Britannia Range (Transantarctic Mountains, Antarctica) highlighted new geological features around the so-called Byrd Glacier discontinuity. Recent field surveys revealed the occurrence of significant amounts of medium- to high-grade metamorphic rocks, intruded by abundant coarse-grained porphyritic granitoids. Most of the granitoids are deformed, with foliation parallel to...
Reassessment of seismically induced, tsunamigenic submarine slope failures in Port Valdez, Alaska, USA
H.J. Lee, H. F. Ryan, Peter J. Haeussler, R. E. Kayen, M. A. Hampton, Jacques Locat, E. Suleimani, C. R. Alexander
Vasilis Lykousis, Dimitris Sakellariou, Jacques Locat, editor(s)
2007, Book chapter, Submarine mass movements and their consequences: 3rd international symposium (Advances in natural and technological hazards research volume 27)
The M9.2 Alaska earthquake of 1964 caused major damage to the port facilities and town of Valdez, most of it the result of submarine landslide and the consequent tsunamis. Recent bathymetric multibeam surveys, high-resolution subbottom profiles, and dated sediment cores in Port Valdez supply new information about the morphology and...
Paleobotany of Livingston Island: The first report of a Cretaceous fossil flora from Hannah Point
M. Leppe, W. Michea, C. Munoz, S. Palma-Heldt, F. Fernandoy
2007, Open-File Report 2007-1047-SRP-081
This is the first report of a fossil flora from Hannah Point, Livingston Island, South Shetland Islands, Antarctica. The fossiliferous content of an outcrop, located between two igneous rock units of Cretaceous age are mainly composed of leaf imprints and some fossil trunks. The leaf assemblage consists of 18 taxa...
Observations related to tetrahydrofuran and methane hydrates for laboratory studies of hydrate-bearing sediments
J.Y. Lee, T.S. Yun, J.C. Santamarina, C. Ruppel
2007, Geochemistry, Geophysics, Geosystems (8)
The interaction among water molecules, guest gas molecules, salts, and mineral particles determines the nucleation and growth behavior of gas hydrates in natural sediments. Hydrate of tetrahydrofuran (THF) has long been used for laboratory studies of gas hydrate-bearing sediments to provide close control on hydrate concentrations and to overcome the...
The Cambrian Ross Orogeny in northern Victoria Land (Antarctica) and New Zealand: A synthesis
L. Federico, G. Capponi, L. Crispini, J.D. Bradshaw
2007, Open-File Report 2007-1047-SRP-063
In the Cambrian, the paleo-Pacific margin of the Gondwana supercontinent included East Antarctica, Australia, Tasmania and New Zealand and was affected by themajor Ross-Delamerian Orogeny. In Antarctica, evidence suggests that this resulted from oblique subduction and that in northern Victoria Land it was accompanied by the opening and subsequent closure...
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...
Solubility of TiO2 in garnet and orthopyroxene: Ti thermometer for ultrahigh-temperature granulites
Toshisuke Kawasaki, Yoichi Motoyoshi
2007, Open-File Report 2007-1047-SRP-038
We report the TiO2 solubility in garnet and orthopyroxene coexisting with rutile calibrated from experimental data at pressures 7–20 kbar and temperatures 850–1300°C in two Antarctic granulite systems.The Ti would substitute for the tetrahedral Si, whereas we could not find positive evidence of the coupled substitution of M-Ti (M is...
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...
Silicified wood from the Permian and Triassic of Antarctica: Tree rings from polar paleolatitudes
P.E. Ryberg, E.L. Taylor
2007, Open-File Report 2007-1047-SRP-080
The mass extinction at the Permian-Triassic boundary produced a floral turnover in Gondwana in which Paleozoic seed ferns belonging to the Glossopteridales were replaced by corystosperm seed ferns and other seed plant groups in the Mesozoic. Secondary growth (wood production) in both plant groups provides information on plant growth in...
High resolution stable isotope and carbonate variability during the early Oligocene climate transition: Walvis Ridge (ODP Site 1263)
2007, Open-File Report 2007-1047-SRP-095
The rapid global increase in benthic foraminiferal δ18O in the early Oligocene (~33.6 Ma) has been taken to imply the first appearance of large, permanent ice sheets on Antarctica, possibly coupled to deep sea cooling and/or Northern Hemisphere ice growth. This oxygen isotope shift is accompanied by a reorganization of...
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...
Coral microbiology
Eugene Rosenberg, Christina A. Kellogg, Forest Rohwer
2007, Oceanography (20) 146-154
In the last 30 years, there has been approximately a 30% loss of corals worldwide, largely due to emerging diseases (Harvell et al., 2002, 2007; Hughes et al., 2003). Coral microbiology is a new field, driven largely by a desire to understand the interactions between corals and their symbiotic microorganisms...
Matching magnetic trends and patterns across the Tintina fault, Alaska and Canada--evidence for offset of about 490 kilometers: Chapter C in Recent U.S. Geological Survey studies in the Tintina Gold Province, Alaska, United States, and Yukon, Canada--results of a 5-year project
Richard W. Saltus
Larry P. Gough, Warren C. Day, editor(s)
2007, Scientific Investigations Report 2007-5289-C
Magnetic anomaly patterns on opposite sides of the mapped Tintina fault in eastern Alaska and western Canada show an apparent offset of about 490 kilometers (km), probably of Eocene age. This estimate is compared with previous geologically based estimates of 400 to 430 km and paleomagnetically based estimates of more...
SCIAMACHY’s View of the Polar Atmosphere
M. Gottwald, E. Krieg, C. von Savigny, S. Noel, A. Reichl, H. Bovensmann, J.P. Burrows
2007, Open-File Report 2007-1047-SRP-011
The instrument SCIAMACHY onboard the European ENVISAT mission provides unique capabilities for deriving atmospheric geophysical parameters. Since its launch in early 2002 it has operated successfully in orbit. Due to ENVISAT’s high inclination orbit the polar regions are monitored continuously. We report here results about the status of the polar...
Crustal structure and evolution of the Mawson Sea, western Wilkes Land margin, East Antarctica
G.L. Leitchenkov, V.V. Gandyukhin, Yu. B. Guseva, A. Yu Kazankov
2007, Open-File Report 2007-1047-SRP-028
Thisstudy is based on about 4000 km of MCS, magnetic and gravity data as well as 10 sonobuoys collected by the 2005 Russian Antarctic Expedition in the Mawson Sea and adjacent Australian-Antarctic basin between 102°E and 115°E. Major identified tectonic provinces and features of the study region include: 1) A marginal...
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...
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...
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...
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...
Survey report of NOAA Ship McArthur II cruises AR-04-04, AR-05-05 and AR-06-03: habitat classification of side scan sonar imagery in support of deep-sea coral/sponge explorations at the Olympic Coast National Marine Sanctuary
Steven S. Intelmann, Guy R. Cochrane, C. Edward Bowlby, Mary Sue Brancato, Jeffrey Hyland
2007, Report
Habitat mapping and characterization has been defined as a high-priority management issue for the Olympic Coast National Marine Sanctuary (OCNMS), especially for poorly known deep-sea habitats that may be sensitive to anthropogenic disturbance. As a result, a team of scientists from OCNMS, National Centers for Coastal Ocean Science (NCCOS), and...
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...
Landscape geochemistry near mineralized areas of eastern Alaska: Chapter H in Recent U.S. Geological Survey studies in the Tintina Gold Province, Alaska, United States, and Yukon, Canada--results of a 5-year project
Bronwen Wang, Larry P. Gough, Richard B. Wanty, James G. Crock, Gregory K. Lee, Warren C. Day, Jim Vohden
2007, Scientific Investigations Report 2007-5289-H
The Pogo lode gold deposit was discovered in eastern Alaska in the early 1990s and provided the opportunity to study elemental distribution and mobility in the natural environment prior to mine development. Studying mineralized systems prior to mining allows us to compare the natural biogeochemical signature in mineralized versus nonmineralized...
