Morphology and stratal geometry of the Antarctic continental shelf : insights from models
This paper is not subject to U.S. copyright. The definitive version was published in Geology and Seismic Stratigraphy of the Antarctic Margin, edited by Peter F. Barker and Alan K. Cooper, :1-24. Washington, DC: American Geophysical Union, 1995. ISBN: 0875908845. doi:10.1029/AR068p0001 Reconstructio...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/1602 2023-05-15T13:53:14+02:00 Morphology and stratal geometry of the Antarctic continental shelf : insights from models ten Brink, Uri S. Schneider, Christopher Johnson, Aaron H. 1995 application/pdf https://hdl.handle.net/1912/1602 en_US eng American Geophysical Union https://doi.org/10.1029/AR068p0001 Geology and Seismic Stratigraphy of the Antarctic Margin, edited by Peter F. Barker and Alan K. Cooper, :1-24. Washington, DC: American Geophysical Union, 1995 https://hdl.handle.net/1912/1602 doi:10.1029/AR068p0001 Geology and Seismic Stratigraphy of the Antarctic Margin, edited by Peter F. Barker and Alan K. Cooper, :1-24. Washington, DC: American Geophysical Union, 1995 doi:10.1029/AR068p0001 Book chapter 1995 ftwhoas https://doi.org/10.1029/AR068p0001 2022-05-28T22:57:17Z This paper is not subject to U.S. copyright. The definitive version was published in Geology and Seismic Stratigraphy of the Antarctic Margin, edited by Peter F. Barker and Alan K. Cooper, :1-24. Washington, DC: American Geophysical Union, 1995. ISBN: 0875908845. doi:10.1029/AR068p0001 Reconstruction of past ice-sheet fluctuations from the stratigraphy of glaciated continental shelves requires understanding of the relationships among the stratal geometry, glacial and marine sedimentary processes, and ice dynamics. We investigate the formation of the morphology and the broad stratal geometry of topsets on the Antarctic continental shelf with numerical models. Our models assume that the stratal geometry and morphology are principally the results of time-integrated effects of glacial erosion and sedimentation related to the location of the seaward edge of the grounded ice. The location of the grounding line varies with time almost randomly across the shelf. With these simple assumptions, the models can successfully mimic salient features of the morphology and the stratal geometry. The models suggest that the current shelf has gradually evolved to its present geometry by many glacial advances and retreats of the grounding line to different locations across the shelf. The locations of the grounding line do not appear to be linearly correlated with either fluctuations in the δ180 record (which presumably represents changes in the global ice volume) or with the global sea-level curve, suggesting that either a more complex relationship exists or local effects dominate. The models suggest that erosion of preglacial sediments is confined to the inner shelf, and erosion decreases and deposition increases toward the shelf edge. Some of the deposited glacial sediments must be derived from continental erosion. The sediments probably undergo extensive transport and reworking obliterating much of the evidence for their original depositional environment. The flexural rigidity and the tectonic subsidence of the underlying ... Book Part Antarc* Antarctic Ice Sheet Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic The Antarctic 1 24 |
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Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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ftwhoas |
language |
English |
description |
This paper is not subject to U.S. copyright. The definitive version was published in Geology and Seismic Stratigraphy of the Antarctic Margin, edited by Peter F. Barker and Alan K. Cooper, :1-24. Washington, DC: American Geophysical Union, 1995. ISBN: 0875908845. doi:10.1029/AR068p0001 Reconstruction of past ice-sheet fluctuations from the stratigraphy of glaciated continental shelves requires understanding of the relationships among the stratal geometry, glacial and marine sedimentary processes, and ice dynamics. We investigate the formation of the morphology and the broad stratal geometry of topsets on the Antarctic continental shelf with numerical models. Our models assume that the stratal geometry and morphology are principally the results of time-integrated effects of glacial erosion and sedimentation related to the location of the seaward edge of the grounded ice. The location of the grounding line varies with time almost randomly across the shelf. With these simple assumptions, the models can successfully mimic salient features of the morphology and the stratal geometry. The models suggest that the current shelf has gradually evolved to its present geometry by many glacial advances and retreats of the grounding line to different locations across the shelf. The locations of the grounding line do not appear to be linearly correlated with either fluctuations in the δ180 record (which presumably represents changes in the global ice volume) or with the global sea-level curve, suggesting that either a more complex relationship exists or local effects dominate. The models suggest that erosion of preglacial sediments is confined to the inner shelf, and erosion decreases and deposition increases toward the shelf edge. Some of the deposited glacial sediments must be derived from continental erosion. The sediments probably undergo extensive transport and reworking obliterating much of the evidence for their original depositional environment. The flexural rigidity and the tectonic subsidence of the underlying ... |
format |
Book Part |
author |
ten Brink, Uri S. Schneider, Christopher Johnson, Aaron H. |
spellingShingle |
ten Brink, Uri S. Schneider, Christopher Johnson, Aaron H. Morphology and stratal geometry of the Antarctic continental shelf : insights from models |
author_facet |
ten Brink, Uri S. Schneider, Christopher Johnson, Aaron H. |
author_sort |
ten Brink, Uri S. |
title |
Morphology and stratal geometry of the Antarctic continental shelf : insights from models |
title_short |
Morphology and stratal geometry of the Antarctic continental shelf : insights from models |
title_full |
Morphology and stratal geometry of the Antarctic continental shelf : insights from models |
title_fullStr |
Morphology and stratal geometry of the Antarctic continental shelf : insights from models |
title_full_unstemmed |
Morphology and stratal geometry of the Antarctic continental shelf : insights from models |
title_sort |
morphology and stratal geometry of the antarctic continental shelf : insights from models |
publisher |
American Geophysical Union |
publishDate |
1995 |
url |
https://hdl.handle.net/1912/1602 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Geology and Seismic Stratigraphy of the Antarctic Margin, edited by Peter F. Barker and Alan K. Cooper, :1-24. Washington, DC: American Geophysical Union, 1995 doi:10.1029/AR068p0001 |
op_relation |
https://doi.org/10.1029/AR068p0001 Geology and Seismic Stratigraphy of the Antarctic Margin, edited by Peter F. Barker and Alan K. Cooper, :1-24. Washington, DC: American Geophysical Union, 1995 https://hdl.handle.net/1912/1602 doi:10.1029/AR068p0001 |
op_doi |
https://doi.org/10.1029/AR068p0001 |
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