Showing 1824 items
1 January, 2007 by Fausto Ferraccioli, Philip Leat, Tom Jordan
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…1 January, 2007 by Carl Robinson, Fausto Ferraccioli, Hugh Corr, Tom Jordan
As we enter the IPY geological boundary conditions for the stability of the East Antarctic Ice Sheet (EAIS) remain largely unknown. During the 2005/06 field season a major new aerogeophysical…1 January, 2007 by David Vaughan, Fausto Ferraccioli, Hugh Corr, Tom Jordan
The West Antarctic Ice Sheet is currently undergoing rapid change in particular over the Amundsen Sea Embayment (ASE). Previous aerogeophysical investigations over the Ross Sea Embayment reveal that the underlying…1 January, 2007 by Teal Riley
Five of six Rb-Sr muscovite mineral isochron ages from the Scotia Metamorphic Complex of the South Orkney Islands, West Antarctica, average 190 ± 4 Ma. The muscovite ages are interpreted…1 January, 2007 by Robert Larter
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…1 January, 2007 by Fausto Ferraccioli
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…Read more on New magnetic anomaly map of East Antarctica and surrounding regions
1 January, 2007 by Claus-Dieter Hillenbrand, James Smith, Joanne Johnson, Robert Larter
The threat, in terms of sea level rise, posed by the potential rapid deglaciation of West Antarctica means there is an urgent need to know more about the speed and…1 January, 2007 by Richard Hindmarsh, Richard Hindmarsh
The Pliocene (c. 5.3 - 1.8 Myr BP) was the last epoch of geological time in which global temperatures were generally higher than modern. It is important if we are…Read more on Characterizing ice sheets during the Pliocene: evidence from data and models
1 January, 2007 by Claus-Dieter Hillenbrand, Robert Larter
A major glacial trough ("Belgica Trough") on the continental shelf in the southern Bellingshausen Sea acted as an important outlet for ice draining the West Antarctic Ice Sheet during the…1 January, 2007 by Richard Hindmarsh, Richard Hindmarsh
1 January, 2007 by Fausto Ferraccioli, Hugh Corr, Tom Jordan
James Ross Island (JRI) exposes a Miocene-Recent alkaline basaltic volcanic complex that developed in a back-arc, east of the northern Antarctic Peninsula. JRI has been the focus of several geological…Read more on High-resolution airborne gravity imaging over James Ross Island (West Antarctica)
1 January, 2007
Marine ecosystems (here referring to plankton assemblages) play an important role in climate because they maintain the atmospheric concentration of CO2 at 200 ppm lower than it would be in…Read more on Impact of climate change on Southern Ocean sink for CO2 and marine ecosystems
1 January, 2007 by Fausto Ferraccioli, Philip Leat, Teal Riley
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…Read more on Jurassic magmatism in Dronning Maud Land: synthesis of results of the MAMOG project
1 January, 2007 by Philip Leat
The magma types belonging to the Gondwana large igneous province can be divided into two categories based on, respectively, their primitive mantle-like and fractionated Sm/Yb and Sr/Zr values, different Sr…1 January, 2007
Many collections of Eocene Fossil leaves from Antarctica contain a rich store of insect trace fossils, indicating that insects were an important component of the unique forests that grew in…Read more on Herbivory in Antarctic fossil forests: evolutionary and palaeoclimatic significance
1 January, 2007
The stability, configuration and volume of the Cenozoic Antarctic Ice Sheet (AIS) are poorly known and contentious. Our investigation of late Neogene glacial and interglacial sediments from James Ross Island,…1 January, 2007 by Robert Larter
The Amundsen Sea continental shelf is one of the remotest areas of coastal Antarctica, and was relatively unexplored until the 1980s. Over the last two decades, however, oceanographic and geological…Read more on New compilation of the Amundsen Sea continental shelf bathymetry
1 January, 2007 by Joanne Johnson
The Neogene geological record in the James Ross Island region (northern Antarctic Peninsula) is dominated by the products of at least 50 mainly effusive basaltic volcanic eruptions that are preserved…1 January, 2007 by Katrin Linse
The opening of the Drake Passage, establishment of the Polar Front and the onset of cooling around the Eocene-Oligocene boundary have been recognised as the most significant events in shaping…Read more on Evolution of the Antarctic marine fauna: what can DNA and fossils tell us?
1 January, 2007 by John Turner
In recent years, there has been an unprecedented level of interest in the climate and environmental conditions of the polar regions. The discovery of the Antarctic ozone hole, record low…Read more on Polar meteorology – understanding global impacts
1 January, 2007 by Robert Larter
An understanding of the glacial history of Pine Island Bay (PIB) is essential for refining models of the future stability of the West Antarctic Ice Sheet (WAIS). New multichannel seismic…1 January, 2007 by Mark Clilverd
As a consequence of alterations of atmospheric chemical composition due to anthropogenic emissions, Earth's ionosphere and thermosphere are expected to change. A number of authors tried to detect signs of…Read more on Unravelling signs of global change in the ionosphere
1 January, 2007
The Phanerozoic is comprised of over 540 million years and, with its defining accompaniment of abundant complex life, provides us with a unique perspective on the extremes of climate change.…Read more on Climate and geology – a Phanerozoic perspective
1 January, 2007 by Eric Wolff
Ice cores have been a cornerstone of global change research in recent decades. Europe has been at the forefront of this science, particularly through the GRIP and EPICA projects funded…1 January, 2007 by Peter Convey
The diversification of Antarctic springtails and mites is likely to have occurred as a result of the glaciation and isolation of the Antarctic continent completed by ~10 million years ago,…1 January, 2007
Pi1 observations, because of their higher frequency, hold the promise of providing better temporal resolution for accurate timing of substorm onsets, thus continuing to be a matter of considerable importance…Read more on An attempt to locate substorm onsets using Pi1 signatures
1 January, 2007 by Fausto Ferraccioli, Tom Jordan
Subglacial sediments are an important control on fast flowing ice in West Antarctica but their spatial distribution over catchment-wide areas is still largely unknown. Previously, airborne gravity anomalies could not…Read more on Locating subglacial sediments across West Antarctica with isostatic gravity anomalies
1 January, 2006 by Alistair Crame
The James Ross Basin, at the northern tip of the Antarctic Peninsula, provides the thickest and best-exposed onshore Cretaceous and Early Tertiary sedimentary succession in Antarctica. When compared with other…1 January, 2006
Introduction In our studies [Chugunova et al., 2002,03,04] we found the occurrence of ULF waves in the nominal Рс3-4 band in the polar cap. About 15% of this ULF activity…1 January, 2006 by Martin Collins
The cirrate octopods are deep-sea, cold-adapted cephalopod molluscs that are found throughout the world's oceans, usually at depths in excess of 300 m, but shallower in cold water at high…Read more on Taxonomy, ecology and behaviour of the cirrate octopods