globalchange  > 气候变化与战略
DOI: 10.1016/j.earscirev.2020.103403
论文题名:
Evolution of deep-sea sediments across the Paleocene-Eocene and Eocene-Oligocene boundaries
作者: Wade B.S.; O'Neill J.F.; Phujareanchaiwon C.; Ali I.; Lyle M.; Witkowski J.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 211
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166286
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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

Recommended Citation:
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]. Earth Science Reviews,2020-01-01,211
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