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Enhanced volcanic activity and long-term warmth in the middle Eocene revealed by mercury and osmium isotopes from IODP Expedition 369 Site U1514

文献类型：期刊论文

作者Lim, Dhongil2,3; Xu, Zhaokai4,5; Kim, Jihun2,3; Wang, Wei6; Ownsworth, Emma7; Selby, David7; Yin, Runsheng1; Chang, Taesoo8
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2024-02-01
卷号627页码:10
ISSN号0012-821X
关键词Middle Eocene warmth Hg and Os isotopes Volcanism Continental weathering Site U1514
DOI10.1016/j.epsl.2023.118565
通讯作者Lim, Dhongil(oceanlim@kiost.ac.kr)
英文摘要Rapid plate reorganization may have influenced global climate during the Eocene; however, its linkage remains poorly constrained, particularly during the middle Eocene. To elucidate this tectonic-climatic relationship, here, we conducted a comprehensive analysis based on high-resolution mercury (Hg) and osmium (Os) abundance and isotope data obtained from the complete Eocene sedimentary sequence of Site U1514, drilled in the Mentelle Basin off southwest Australia. The Hg signals in this sedimentary sequence, which are characterized by significantly high enrichment and insignificant mass-independent fractionation (Delta Hg-199) signal, confirm that the middle Eocene (similar to 45-38 Ma) was a period of persistent, increased volcanism, accompanied by intense tectonic activity. In particular, a remarkable seafloor volcanic eruption persisted for approximately 1.5 million years (similar to 42.0-40.5 Ma), immediately preceding the Middle Eocene Climate Optimum (MECO). Contemporaneously, the trends toward a slightly more radiogenic seawater Os-187/Os-188 (Osi) composition denote the prevalence of intensified continental weathering under a warm, humid climate during the middle Eocene, a phenomenon particularly evident during the MECO. Importantly, the Hg and Os records from Site U1514 reveal the occurrence of a multi-million-year warming reversal amid the long-term Eocene cooling trend, which likely contributed to significant CO2 reduction during the late Eocene. These findings significantly enhance our understanding of Eocene climate dynamics, which are fundamentally linked to intensive tectonic-driven volcanic activity and associated continental chemical weathering.
WOS关键词ATMOSPHERIC CO2 ; EARTHS CLIMATE ; HG ISOTOPES ; OCEAN ; OS-187/OS-188 ; RECORD ; CYCLE ; EVENT ; STRATIGRAPHY ; EVOLUTION
资助项目National Research Foundation of Korea[2021R1A2C1014443] ; National Research Foundation of Korea[2021R1I1A2059972] ; National Key Research and Development Program of China[2022YFF0800503] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB40010100]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:001154761600001
源URL[http://ir.qdio.ac.cn/handle/337002/184413]  
专题海洋研究所_海洋地质与环境重点实验室
通讯作者Lim, Dhongil
作者单位1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China
2.Korea Inst Ocean Sci & Technol, Pusan 49111, South Korea
3.Univ Sci & Technol, Major Ocean Sci, Daejeon 34113, South Korea
4.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
5.Laoshan Lab, Lab Marine Geol, Qingdao 266061, Peoples R China
6.China Natl Offshore Oil Corp, Shenzhen Branch, Shenzhen 518000, Peoples R China
7.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
8.Chonnam Natl Univ, Dept Geol, Kwangju 61186, South Korea
推荐引用方式
GB/T 7714		 Lim, Dhongil,Xu, Zhaokai,Kim, Jihun,et al. Enhanced volcanic activity and long-term warmth in the middle Eocene revealed by mercury and osmium isotopes from IODP Expedition 369 Site U1514[J]. EARTH AND PLANETARY SCIENCE LETTERS,2024,627:10.
APA Lim, Dhongil.,Xu, Zhaokai.,Kim, Jihun.,Wang, Wei.,Ownsworth, Emma.,...&Chang, Taesoo.(2024).Enhanced volcanic activity and long-term warmth in the middle Eocene revealed by mercury and osmium isotopes from IODP Expedition 369 Site U1514.EARTH AND PLANETARY SCIENCE LETTERS,627,10.
MLA Lim, Dhongil,et al."Enhanced volcanic activity and long-term warmth in the middle Eocene revealed by mercury and osmium isotopes from IODP Expedition 369 Site U1514".EARTH AND PLANETARY SCIENCE LETTERS 627(2024):10.

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来源：海洋研究所

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