Geomorphology and sedimentology of the continental shelf adjacent to Mac. Robertson Land,East Antarctica: A scalped shelf |
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| Authors: | P T Harris P E O'Brien |
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| Institution: | (1) Antarctic CRC, Australian Geological Survey Organisation, University of Tasmania, GPO Box 252C, 7001 Hobart, Tasmania, Australia;(2) Antarctic CRC, Australian Geological Survey Organisation, GPO Box 378, 2601 Canberra, ACT, Australia |
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| Abstract: | During the Quaternary, the Mac. Robertson shelf of East Antarctica was deeply eroded by glaciers and currents exposing the underlying basement, resulting in a scalped shelf. Major geomorphic zones are: (1) high-relief, ridge and valley topography (200–1400 m); (2) smooth sea floors associated with low-energy, depositional shelf valleys and basins (400–800 m); (3) low-relief, planated banktops (100–200 m); and (4) iceberg gouged and current reworked seaward-bank margins and upper slope (200 to < 630 m). About 90% of the shelf's surface has net erosional conditions and about 10% is net depositional. The sedimentary processes and deposits may be common to large areas of the East Antarctic margin. |
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