Concept information
Preferred term
AGAP
Definition
- Short Title: Antarctica's Gamburtsev Province (AGAP) Proposal URL: http://classic.ipy.org/development/eoi/proposal-details.php?id=67 This project is a multinational campaign to collect a range of data that will impact on our understanding of the Earth as a bipolar coupled system, where Antarctica's evolution impacts on global scale changes of sea level, ice volume and climate. This project involves a transect from the centre of the Antarctic continent, where the ice sheet is underlain by the Gamburtsev Mountains, northwards into Prydz Bay. We will acquire major new data sets including offshore marine data, gravity, magnetics, ice radar soundings and a wealth of geological observations. This will also be part of a multinational Gamburtsev Mountains IPY expedition that will include the GAMBIT (EoI 558) regional aerogeophysical program, a Chinese drilling program (GMDP) and a passive seismic experiment (GAMSEIS - EoI 412). The main objective is to derive a four dimensional evolutionary history of the area of East Antarctica affected by the world's largest glacier (Lambert) and associated ice shelf (Amery). The project is focused in an area that exhibits the largest set of geological exposures in East Antarctica (Prince Charles Mountains). This southern part of the transect will cover the Gamburtsev Subglacial Mountains. Nothing is known about the nature of this ice-covered Antarctic "highland". It was from this region that the expanding Antarctic ice sheet originated and it has been suggested that during warmer periods, this terrain was drained first by ice streams and then, nearer the coast, by rivers from which thick sediments accumulated. In the Late Palaeozoic and Mesozoic these sediments probably included the Amery Group of East Antarctica together with a huge succession of similarly aged sediments that were deposited in Africa, India and Australia. The modern East Antarctic ice sheet is also thought to have nucleated on this highland, and progressively expanded from there to cover the continent as Antarctica gradually cooled. The marine sub-project will target the Lambert Rift system in the area of Prydz Bay with acquisition of deep crustal geophysical data and sediment cores that will be integrated with the continental based data sets. The sedimentary and glacial history of Prydz Bay and the structural grain of its uppermost basement are relatively well known from extensive shallow to medium depth seismic reflection profiling and ODP Legs 119 and 188. This existing information will serve as an important parameter basis to build deep dynamic crustal and lithospheric models of the evolution of the Lambert Rift system and its role in the ice-sheet dynamics of East Antarctica. The marine geoscience activities will be facilitated through the deployment of the RV "Polarstern" and the RV "Akademik Alexander Karpinsky" in 2007, with a continental and airborne based program in the Prince Charles Mountains and the Gamburtsev Mountains during the 2007/08 austral summer. (en)
Broader concept
- A - C (en)
URI
https://gcmd.earthdata.nasa.gov/kms/concept/9162e1c9-968b-4d07-b396-e7e4a745ada0
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