气候变化领域集成服务门户(CCPortal): Evolution of deep-sea sediments across the Paleocene-Eocene and Eocene-Oligocene boundaries

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DOI	10.1016/j.earscirev.2020.103403
	Evolution of deep-sea sediments across the Paleocene-Eocene and Eocene-Oligocene boundaries
	Wade B.S.; O'Neill J.F.; Phujareanchaiwon C.; Ali I.; Lyle M.; Witkowski J.
发表日期	2020
ISSN	00128252
卷号	211
英文摘要	The composition and distribution of deep-sea sediments is the result of a multitude of climatic, biotic and oceanic conditions relating to biogeochemical cycles and environmental change. Here we utilize the extensive sediment archives of the International Ocean Discovery Program (IODP) and its predecessors to construct maps of deep-sea sediment type across two critical but contrasting boundaries in the Paleogene, one characterised by an interval of extreme warmth (Paleocene/Eocene) and the other by global cooling (Eocene/Oligocene). Ocean sediment distribution shows significant divergence both between the latest Paleocene and Paleocene Eocene Thermal Maximum (PETM), across the Eocene-Oligocene Transition (EOT), and in comparison to modern sediment distributions. Carbonate sedimentation in the latest Paleocene extends to high southern latitudes. Disappearance of carbonate sediments at the PETM is well documented and can be attributed to dissolution caused by significant ocean acidification as a result of carbon-cycle perturbation. Biosiliceous sediments are rare and it is posited that the reduced biogenic silica deposition at the equator is commensurate with an overall lack of equatorial upwelling in the early Paleogene ocean. In the Southern Ocean, we attribute the low in biosiliceous burial, to the warm deep water temperatures which would have impacted biogenic silica preservation. In the late Eocene, our sediment depositional maps record a tongue of radiolarian ooze in the eastern equatorial Pacific. Enhanced biosiliceous deposits in the late Eocene equatorial Pacific and South Atlantic are due to increased productivity and the spin-up of the oceans. Our compilation documents the enhanced global carbonate sedimentation in the early Oligocene, confirming that the drop in the carbonate compensation depth was global. © 2020 Elsevier B.V.
关键词	Carbonate compensation depth Dissolution Eocene/Oligocene boundary PETM Sediments Silica
英文关键词	carbonate sediment; deep-sea sediment; dissolution; Eocene-Oligocene boundary; Paleocene-Eocene boundary; sediment transport; sedimentation; silica; water temperature; Southern Ocean
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203917
作者单位	Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, United Kingdom; Department of Geography, King's College London, Bush House (NE wing), 30 Aldwych, London, WC2B 4BG, United Kingdom; Department of Geology, Chulalongkorn University, 254 Phayathai Rd, Khwaeng Pathum Wan, Khet Pathum Wan, Bangkok, 10330, Thailand; PetroStrat Limited, Tan-y-Graig, Parc Caer Seion, Conwy, North Wales LL32 8FA, United Kingdom; College of Earth, Ocean, and Atmospheric Science, Oregon State University, 104 CEOAS Admin Bldg, Corvallis, OR 97331, United States; Institute of Marine and Environmental Sciences, University of Szczecin, ul. Mickiewicza 16a, Szczecin, 70-383, Poland
推荐引用方式 GB/T 7714	Wade B.S.,O'Neill J.F.,Phujareanchaiwon C.,et al. Evolution of deep-sea sediments across the Paleocene-Eocene and Eocene-Oligocene boundaries[J],2020,211.
APA	Wade B.S.,O'Neill J.F.,Phujareanchaiwon C.,Ali I.,Lyle M.,&Witkowski J..(2020).Evolution of deep-sea sediments across the Paleocene-Eocene and Eocene-Oligocene boundaries.Earth Science Reviews,211.
MLA	Wade B.S.,et al."Evolution of deep-sea sediments across the Paleocene-Eocene and Eocene-Oligocene boundaries".Earth Science Reviews 211(2020).