globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116437
论文题名:
P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System
作者: Lucas E.M.; Soto D.; Nyblade A.A.; Lloyd A.J.; Aster R.C.; Wiens D.A.; O'Donnell J.P.; Stuart G.W.; Wilson T.J.; Dalziel I.W.; Winberry J.P.; Huerta A.D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 546
语种: 英语
中文关键词: Antarctica ; mantle structure ; seismic tomography ; West Antarctic Ice Sheet ; West Antarctic Rift System
英文关键词: Acoustic wave velocity ; Earthquakes ; Landforms ; Percolation (fluids) ; Shear waves ; Tectonics ; Wave propagation ; Low-velocity anomaly ; P- and S-wave velocities ; Pine island glaciers ; Tectonic activity ; Tectonic evolution ; Teleseismic earthquakes ; Upper mantle structure ; Variable velocities ; Structural geology ; mantle plume ; mantle source ; P-wave ; S-wave ; tectonic evolution ; velocity structure ; wave velocity ; Antarctica ; West Antarctica
英文摘要: New P- and S-wave velocity models of the upper mantle from 100 to 400 km depth beneath the central portions of West Antarctica, obtained by inverting relative travel-times from teleseismic earthquakes recorded on Polar Earth Observing Network (POLENET/ANET) and UK Antarctic Network (UKANET) seismic stations between 2007 and 2017, reveal a heterogeneous upper mantle. A low velocity anomaly (−1.0% Vp; −2.0% Vs) imaged beneath Marie Byrd Land is attributed to thermally perturbed upper mantle of possible plume origin, and a low velocity anomaly imaged beneath the Pine Island Glacier and the mouth of Thwaites Glacier is interpreted as a rift-related thermal structure that may include warm mantle flowing from Marie Byrd Land. High velocity anomalies (≤0.8% Vp; 1.5% Vs) imaged in the central portion of the West Antarctic Rift System indicate the presence of lithosphere unmodified by tectonic activity since the Late Cretaceous formation of the rift system. Within the region of high velocities, localized low velocity anomalies beneath parts of the Bentley Subglacial Trench are suggestive of focused Cenozoic rifting. The models also show variable velocity structure beneath the Haag-Ellsworth Whitmore crustal block and low velocities beneath the Thurston Island-Eights Coast crustal block. The heterogenous upper mantle structure of central West Antarctica indicates that upper mantle temperatures could vary by 100 K or more over distances of less than 100 km, which may add complexity to solid earth-ice interactions and influence basal ice sheet conditions. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165139
Appears in Collections:气候变化与战略

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作者单位: Department of Geosciences, Pennsylvania State University, 503 Deike Building, University Park, PA 16802, United States; Department of Earth and Planetary Sciences, Washington University in St. Louis, 1 Brookings Dr., St. Louis, MO 63130, United States; Department of Geosciences, Warner College of Natural Resources, Colorado State University, 400 University Ave., Fort Collins, CO 80523, United States; School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; School of Earth Sciences, Ohio State University, 125 Oval Dr. S, Columbus, OH 43210, United States; Jackson School of Geosciences, University of Texas at Austin, 2305 Speedway, Austin, TX 78712, United States; Department of Geological Sciences, Central Washington University, 400 E. University Way, Ellensburg, WA 98926, United States

Recommended Citation:
Lucas E.M.,Soto D.,Nyblade A.A.,et al. P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System[J]. Earth and Planetary Science Letters,2020-01-01,546
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