气候变化领域集成服务门户(CCPortal): Large-scale mass wasting on the miocene continental margin of Western India

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DOI	10.1130/B35158.1
	Large-scale mass wasting on the miocene continental margin of Western India
	Dailey S.K.; Clift P.D.; Kulhanek D.K.; Blusztajn J.; Routledge C.M.; Calvès G.; O'Sullivan P.; Jonell T.N.; Pandey D.K.; Andò S.; Coletti G.; Zhou P.; Li Y.; Neubeck N.E.; Bendle J.A.P.; Aharonovich S.; Griffith E.M.; Gurumurthy G.P.; Hahn A.; Iwai M.; Khim B.K.; Kumar A.; Kumar A.G.; Liddy H.M.; Lu H.; Lyle M.W.; Mishra R.; Radhakrishna T.; Saraswat R.; Saxena R.; Scardia G.; Sharma G.K.; Singh A.D.; Steinke S.; Suzuki K.; Tauxe L.; Tiwari M.; Xu Z.; Yu Z.
发表日期	2020
ISSN	167606
起始页码	85
结束页码	112
卷号	132 期号:2021-01-02
英文摘要	A giant mass-transport complex was recently discovered in the eastern Arabian Sea, exceeding in volume all but one other known complex on passive margins worldwide. The complex, named the Nataraja Slide, was drilled by International Ocean Discovery Program (IODP) Expedition 355 in two locations where it is ~300 m (Site U1456) and ~200 m thick (Site U1457). The top of this mass-transport complex is defined by the presence of both reworked microfossil assemblages and deformation structures, such as folding and faulting. The deposit consists of two main phases of mass wasting, each consisting of smaller pulses, with generally fining-upward cycles, all emplaced just prior to 10.8 Ma based on biostratigraphy. The base of the deposit at each site is composed largely of matrix-supported carbonate breccia that is interpreted as the product of debris-flows. In the first phase, these breccias alternate with wellsorted calcarenites deposited from a high-energy current, coherent limestone blocks that are derived directly from the Indian continental margin, and a few clastic mudstone beds. In the second phase, at the top of the deposit, muddy turbidites dominate and become increasingly more siliciclastic. At Site U1456, where both phases are seen, a 20-m section of hemipelagic mudstone is present, overlain by a ~40-m-thick section of calcarenite and slumped interbedded mud and siltstone. Bulk sediment geochemistry, heavy-mineral analysis, clay mineralogy, isotope geochemistry, and detrital zircon U-Pb ages constrain the provenance of the clastic, muddy material to being reworked, Indus-derived sediment, with input from western Indian rivers (e.g., Narmada and Tapti rivers), and some material from the Deccan Traps. The carbonate blocks found within the breccias are shallow-water limestones from the outer western Indian continental shelf, which was oversteepened from enhanced clastic sediment delivery during the mid-Miocene. The final emplacement of the material was likely related to seismicity as there are modern intraplate earthquakes close to the source of the slide. Although we hypothesize that this area is at low risk for future mass wasting events, it should be noted that other oversteepened continental margins around the world could be at risk for mass failure as large as the Nataraja Slide. © 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/184870
作者单位	Department of Geology and Geophysics, Louisiana State University, E253 Howe-Russell-Kniffen Geoscience Complex, Baton Rouge, LA 70803, United States; International Ocean Discovery Program, Texas A and M University, 1000 Discovery Drive, College Station, TX 77845, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, United Kingdom; Université Toulouse 3, Paul Sabatier, Géosciences Environnement Toulouse, 14 Avenue Edouard Belin, Toulouse, 31400, France; GeoSep Services, 1521 Pine Cone Road, Moscow, ID 83843, United States; School of Earth and Environmental Sciences, University of Queensland, St. Lucia, QLD 4072, Australia; National Centre for Polar and Ocean Research, Vasco da Gama, Goa, 403804, India; Department of Earth and Environmental Sciences, University of Milano Bicocca, Piazza della Scienza 4, Milan, 20126, Italy; Department of Ear...
推荐引用方式 GB/T 7714	Dailey S.K.,Clift P.D.,Kulhanek D.K.,et al. Large-scale mass wasting on the miocene continental margin of Western India[J],2020,132(2021-01-02).
APA	Dailey S.K..,Clift P.D..,Kulhanek D.K..,Blusztajn J..,Routledge C.M..,...&Yu Z..(2020).Large-scale mass wasting on the miocene continental margin of Western India.Bulletin of the Geological Society of America,132(2021-01-02).
MLA	Dailey S.K.,et al."Large-scale mass wasting on the miocene continental margin of Western India".Bulletin of the Geological Society of America 132.2021-01-02(2020).