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Showing 1 to 20 of 31 for “"East Antarctica"”.
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Sub-Ice Relief and Geology of East Antarctica
… of the sub-ice topographic configuration of Eastern Antarctica. Reduction and evaluation of profiles of ice/bedrock interface, combined with critically assessed results of previous geophysical and geological investigations, has allowed some interpretation of the geological structure and …
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Evolving subglacial water systems in East Antarctica from airborne radar sounding
… pressure aquatic environment at the base of the East Antarctic Ice Sheet is of interest to a wide range of disciplines. Stable subglacial lakes and their connecting channels remain perennially liquid three kilometers below some of the coldest places on Earth. The presence of subglacial water …
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Meteoric 10Be as a Tracer for Subglacial Chemical Weathering in East Antarctica
Subglacial chemical processes in Antarctica are potentially significant contributors to global geochemical cycles, but current understanding of their scale and nature is limited. A sequential chemical extraction procedure was developed and tested to investigate the utility of meteoric 10Be as a …
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Bacterial communities in glacier forefields of the Larsemann Hills, East Antarctica : structure, development & adaptation
… two glacier forfields of the Larsemann Hills, East Antarctica. Culture-independent molecular tools such as terminal restriction length polymorphism (T-RFLP), clone libraries and quantitative real-time PCR (qPCR) were used to determine bacterial diversity and distribution. Cultivation of yet …
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Glaciomarine sedimentation at the continental margin of Prydz Bay, East Antarctica : implications on palaeoenvironmental changes during the Quaternary
… Prydz Bay is a key region for the study of East EAIS dynamics, as 16% of the EAIS are drained through the Lambert Glacier into the bay. Thereby, the glacier transports sediment into Prydz Bay which is then further distributed by calving icebergs or by current transport. The scientific …
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A stable isotope investigation into fluid-rock interaction during regional metamorphism in western dronning maud land, East Antarctica
The Sverdrupfjella Group in western Dronning Maud Land forms part of a 1200 Ma to 900 Ma orogenic belt which experienced a thermal overprint at around 500 Ma. Although the degree of tectonic reworking during this later event remains uncertain, evidence for late fluid alteration is widespread. In …
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A metamorphic and geochemical study of mafic rocks across the Pencksökket-Jutulstraumen Discontinuity, western Dronning Maud Land, East Antarctica
… Maud Belt in western Dronning Maud Land, East Antarctica, revealed a difference in peak metamorphic conditions from T = ~275° to 730°C and P=2 to 10.7 kbar over a distance of only 30 km across a major glacial valley. The lower grade constraints were derived from average P-T calculations …
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Quantification of the Impact of Supraglacial Lakes and Slush on Surface Energy Balance of Ice Shelves: Nivlisen Ice Shelf, East Antarctica
… by SGLs and slush on Nivlisen Ice Shelf (NIS), East Antarctica, over the austral summers of 2017-2020. First, a new method is developed for defining SGL, slush, and ice extent using a Principal Components Analysis (PCA) on spectral data derived from Sentinel-2 and Landsat 8 imagery. A surface …
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Studies of Seismic Sources in Antarctica Using an Extensive Deployment of Broadband Seismographs
… comprehensive study reporting the seismicity of Antarctica utilizing year-round recordings from autonomous instruments installed on the continent itself. I first examine the general seismic nature of the continent using locally deployed seismographs in both East Antarctica and West Antarctica. I …
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RECONSTRUCTING PAST ANTARCTIC ICE FLOW PATHS IN THE ROSS EMBAYMENT, ANTARCTICA USING SAND PETROGRAPHY, PARTICLE SIZE AND DETRITAL ZIRCON PROVENANCE
Tills for this study were analyzed from sites in East Antarctica (EA), West Antarctica (WA) and along a transect in the Ross Sea. Particle size, sand petrography, and detrital zircons were used to provide new information on the subglacial geology of Antarctica, as well as assisting in the …
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Antarctic Station-based Pressure Reconstructions from 1905-2011 using Principal Component Regression
<p>In Antarctica, most weather stations did not start collecting meteorological observations until the late 1950s. To extend these records and provide a more complete picture of the pressure variability at each station, this thesis reconstructs the pressure records at 18 different Antarctic …
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Antarctica's Geologic and Ice Sheet History from Isotopic Sedimentary Provenance Studies
… from marine sediments located off the margin of East Antarctica provides a means for characterizing the sub-glacial geology obscured by the more than 98% ice cover of the continent. These insights into the geology of East Antarctica in turn provide characterization of sedimentary source areas, …
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Chemical Weathering History of Antarctica During A Late Eocene Glacial Event
… from ODP Site 738 sediments off the coast of East Antarctica have offered insight into the variable climate of the Paleogene 'greenhouse.' In this study, I compile evidence from fine fraction carbonate, benthic foraminifera, fossil fish teeth, detrital sediment, and sea level records to build …
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ANTARCTIC GLACIAL CHRONOLOGY REFLECTED IN THE OLIGOCENE THROUGH PLIOCENE SEDIMENTARY SECTION IN THE ROSS SEA
Over 24% of the ice surface area covering East and West Antarctica drains into the Ross Sea and supplies the Ross Ice Shelf. The dominant proportion of this ice originates from the West Antarctic subcontinent. Thus, any change in the glacial regime in West Antarctica, and to a lesser extent East …
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Detrital Zircon Analysis of Permian Victoria Group Sandstones, Transantarctic Mountains, Antarctica
… Mountains, the Gondwana sequence of Antarctica, comprises Devonian (inferred) and Permian-Triassic strata. The latter were deposited in an intracratonic basin which evolved into a foreland basin in mid Permian time. Sedimentary petrology and paleocurrent data indicate that this basin …
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Tectono-thermal evolution of Gjelsvikfjella, Western Dronning Maud Land, Antarctica
East Antarctica is dominated by the East Antarctic Craton, which consists of fragments of Archaean continental crust surrounded by polydeformed orogenic belts (e.g. Maud Belt). The Maud Belt in Dronning Maud Land preserves a high-grade polyphase tectono-thermal history. This belt has traditionally …
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Surface Wave Inversion of the Upper Mantle Velocity Structure in the Ross Sea Region, Western Antarctica
<p>The Ross Sea in Western Antarctica is the locale of several extensional basins formed during Cretaceous to Paleogene rifting. Several seismic studies along the Transantarctic Mountains and Victoria Land Basin’s Terror Rift have shown a general pattern of fast seismic velocities in East …
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On the Application of Machine Learning to Planetary Sciences
… analog of Jupiter's moon Europa (Lake Vostok, East Antarctica) in order to constrain the temperature profile and the composition of the ice. The expected performance of this new data fusion approach is finally discussed in the context of the forthcoming NASA Clipper and ESA JUICE missions to …
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The influence of topography on ice-ocean interactions in coastal Antarctica
… 4, we switch to a realistic model of Prydz Bay, East Antarctica, to test the impact of local icebergs on cross-shelf exchange, dense water formation, and ice shelf basal melt rates. We find that removing the Cape Darnley Ice Barrier increases CDW intrusions and decreases dense water formation due …
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The Dynamics of the Late Neogene Antarctic Ice Sheets in the Central Ross Sea using a Multianalytical Approach
… dolerite clasts are present signaling a shift to East Antarctic derived ice. Above Ross Sea Unconformity 3, early to mid Pliocene samples show a shift back to West Antarctic provenance with abundant Cretaceous zircons and more radiogenic neodymium values. Late Pliocene to Pleistocene samples, …
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