气候变化领域集成服务门户(CCPortal): P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System

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DOI	10.1016/j.epsl.2020.116437
	P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System
	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.
发表日期	2020
ISSN	0012821X
卷号	546
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202761
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
推荐引用方式 GB/T 7714	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],2020,546.
APA	Lucas E.M..,Soto D..,Nyblade A.A..,Lloyd A.J..,Aster R.C..,...&Huerta A.D..(2020).P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System.Earth and Planetary Science Letters,546.
MLA	Lucas E.M.,et al."P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System".Earth and Planetary Science Letters 546(2020).