气候变化领域集成服务门户(CCPortal): Seismic stratigraphy of the Sabrina Coast shelf, East Antarctica: Early history of dynamic meltwater-rich glaciations

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DOI	10.1130/B35100.1
	Seismic stratigraphy of the Sabrina Coast shelf, East Antarctica: Early history of dynamic meltwater-rich glaciations
	Montelli A.; Gulick S.P.S.; Fernandez R.; Frederick B.C.; Shevenell A.E.; Leventer A.; Blankenship D.D.
发表日期	2020
ISSN	167606
起始页码	545
结束页码	561
卷号	132 期号:2021-03-04
英文摘要	High-resolution seismic data from the Sabrina Coast continental shelf, East Antarctica, elucidate the Cenozoic evolution of the East Antarctic Ice Sheet. Detailed seismic stratigraphic and facies analysis reveal the Paleogene to earliest Pliocene glacial evolution of the Aurora Basin catchment, including at least 12 glacial expansions across the shelf indicated by erosional surfaces and chaotic acoustic character of strata. Differences in facies composition and seismic architecture reveal several periods of ice-free conditions succeeded by glacial expansions across the shelf. A deep (~100 m), undulating erosional surface suggests the initial appearance of grounded ice on the shelf. Following the initial ice expansion, the region experienced an interval of open-marine to ice-distal conditions, marked by an up to 200-m-thick sequence of stratified sediments. At least three stacked erosional surfaces reveal major cross-shelf glacial expansions of regional glaciers characterized by deep (up to ~120 m) channel systems associated with extensive subglacial meltwater. The seismic character of the sediments below the latest Miocene to earliest Pliocene regional unconformity indicates intervals of glacial retreat interrupted by advances of temperate, meltwater-rich glacial ice from the Aurora Basin catchment. Our results document the Paleogene to late Miocene glacial history of this climatically sensitive region of East Antarctica and provide an important paleoenvironmental context for future scientific drilling to constrain the regional climate and timing of Cenozoic glacial variability. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184818
作者单位	Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78758, United States; College of Marine Science, University of South Florida, Saint Petersburg, FL 33701, United States; Geology Department, Colgate University, Hamilton, NY 13346, United States
推荐引用方式 GB/T 7714	Montelli A.,Gulick S.P.S.,Fernandez R.,et al. Seismic stratigraphy of the Sabrina Coast shelf, East Antarctica: Early history of dynamic meltwater-rich glaciations[J],2020,132(2021-03-04).
APA	Montelli A..,Gulick S.P.S..,Fernandez R..,Frederick B.C..,Shevenell A.E..,...&Blankenship D.D..(2020).Seismic stratigraphy of the Sabrina Coast shelf, East Antarctica: Early history of dynamic meltwater-rich glaciations.Bulletin of the Geological Society of America,132(2021-03-04).
MLA	Montelli A.,et al."Seismic stratigraphy of the Sabrina Coast shelf, East Antarctica: Early history of dynamic meltwater-rich glaciations".Bulletin of the Geological Society of America 132.2021-03-04(2020).