globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1992
论文题名:
Seismic detection of an active subglacial magmatic complex in Marie Byrd Land, Antarctica
作者: Lough A.C.; Wiens D.A.; Grace Barcheck C.; Anandakrishnan S.; Aster R.C.; Blankenship D.D.; Huerta A.D.; Nyblade A.; Young D.A.; Wilson T.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:12
起始页码: 1031
结束页码: 1035
语种: 英语
Scopus关键词: detection method ; heat flow ; Holocene ; ice stream ; magmatism ; meltwater ; Miocene ; subglacial environment ; volcanic eruption ; volcanism ; Antarctica ; Marie Byrd Land ; West Antarctica ; Calluna vulgaris
英文摘要: Numerous volcanoes exist in Marie Byrd Land, a highland region of West Antarctica. High heat flow through the crust in this region may influence the stability of the West Antarctic Ice Sheet. Volcanic activity progressed from north to south in the Executive Committee mountain range between the Miocene and Holocene epochs, but there has been no evidence for recent magmatic activity. Here we use a recently deployed seismic network to show that in 2010 and 2011, two swarms of seismic activity occurred at 25-40 km depth beneath subglacial topographic and magnetic highs, located 55 km south of the youngest subaerial volcano in the Executive Committee Range. We interpret the swarm events as deep long-period earthquakes based on their unusual frequency content. Such earthquakes occur beneath active volcanoes, are caused by deep magmatic activity and, in some cases, precede eruptions. We also use radar profiles to identify a prominent ash layer in the ice overlying the seismic swarm. Located at 1,400 m depth, the ash layer is about 8,000 years old and was probably sourced from the nearby Mount Waesche volcano. Together, these observations provide strong evidence for ongoing magmatic activity and demonstrate that volcanism continues to migrate southwards along the Executive Committee Range. Eruptions at this site are unlikely to penetrate the 1.2 to 2-km-thick overlying ice, but would generate large volumes of melt water that could significantly affect ice stream flow. © 2013 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106649
Appears in Collections:气候减缓与适应
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作者单位: Department of Earth and Planetary Sciences, Washington University, St Louis, MO 63130, United States; Department of Earth and Planetary Sciences, University of California-Santa Cruz, Santa Cruz, CA 95064, United States; Department of Geosciences, Pennsylvania State University, University Park, PA 16802, United States; Department of Earth and Environmental Science, New Mexico Tech, Socorro, NM 87801, United States; Geosciences Department, Colorado State University, Fort Collins, CO 80523, United States; Institute for Geophysics, University of Texas at Austin, Austin, TX 78759, United States; Department of Geological Science, Central Washington University, Ellensburg, WA 98926, United States; Department of Geological Sciences, Ohio State University, Columbus, OH 43210, United States

Recommended Citation:
Lough A.C.,Wiens D.A.,Grace Barcheck C.,et al. Seismic detection of an active subglacial magmatic complex in Marie Byrd Land, Antarctica[J]. Nature Geoscience,2013-01-01,6(12)
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