| DOI: | 10.1016/j.gloplacha.2014.09.006
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| 论文题名: | Anomalous South Pacific lithosphere dynamics derived from new total sediment thickness estimates off the West Antarctic margin |
| 作者: | Wobbe F.; Lindeque A.; Gohl K.
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| ISSN: | 0921-8404
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| 出版年: | 2014
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| 卷: | 123, 期:PA | | 起始页码: | 139
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| 结束页码: | 149
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| 语种: | 英语
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| 英文关键词: | Dynamic topography
; Paleotopography
; Residual basement depth
; Sediment isopach map
; Sediment thickness grid
; Sediment volume
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| Scopus关键词: | Buildings
; Computer simulation
; Planetary surface analysis
; Saline water
; Topography
; Dynamic topography
; Paleotopography
; Residual basement depth
; Sediment thickness
; Sediment volumes
; Sediments
; borehole
; data set
; geodynamics
; lithospheric structure
; marine sediment
; new record
; paleotopography
; reconstruction
; sediment thickness
; seismic reflection
; Amundsen Sea
; Antarctica
; Bellingshausen Sea
; Marie Byrd Land
; Pacific Ocean
; Pacific Ocean (South)
; Ross Sea
; Southern Ocean
; West Antarctica
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| 英文摘要: | Paleotopographic models of the West Antarctic margin, which are essential for robust simulations of paleoclimate scenarios, lack information on sediment thickness and geodynamic conditions, resulting in large uncertainties. A new total sediment thickness grid spanning the Ross Sea-Amundsen Sea-Bellingshausen Sea basins is presented and is based on all the available seismic reflection, borehole, and gravity modeling data offshore West Antarctica. This grid was combined with NGDC's global 5 arc minute grid of ocean sediment thickness (Whittaker et al., 2013) and extends the NGDC grid further to the south. Sediment thickness along the West Antarctic margin tends to be 3-4km larger than previously assumed. The sediment volume in the Bellingshausen, Amundsen, and Ross Sea basins amounts to 3.61, 3.58, and 2.78millionkm3, respectively. The residual basement topography of the South Pacific has been revised and the new data show an asymmetric trend over the Pacific-Antarctic Ridge. Values are anomalously high south of the spreading ridge and in the Ross Sea area, where the topography seems to be affected by persistent mantle processes. In contrast, the basement topography offshore Marie Byrd Land cannot be attributed to dynamic topography, but rather to crustal thickening due to intraplate volcanism. Present-day dynamic topography models disagree with the presented revised basement topography of the South Pacific, rendering paleotopographic reconstructions with such a limited dataset still fairly uncertain. © 2014 The Authors.Published by Elsevier B.V. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84912013655&doi=10.1016%2fj.gloplacha.2014.09.006&partnerID=40&md5=2eb1c674695b5b531b94b3831dd030d7
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/11310
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| Appears in Collections: | 全球变化的国际研究计划
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作者单位: | Alfred Wegener Institute for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, Germany
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| Recommended Citation: | |
Wobbe F.,Lindeque A.,Gohl K.. Anomalous South Pacific lithosphere dynamics derived from new total sediment thickness estimates off the West Antarctic margin[J],2014-01-01,123(PA).
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