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

doi:10.1016/j.epsl.2023.118565

IOCAS-IR > 海洋地质与环境重点实验室

	Enhanced volcanic activity and long-term warmth in the middle Eocene revealed by mercury and osmium isotopes from IODP Expedition 369 Site U1514
	Lim, Dhongil 1,2; Xu, Zhaokai 3,4; Kim, Jihun 1,2; Wang, Wei 5; Ownsworth, Emma 6; Selby, David 6; Yin, Runsheng 7; Chang, Taesoo 8
	2024-02-01
发表期刊	EARTH AND PLANETARY SCIENCE LETTERS
ISSN	0012-821X
卷号	627 页码:10
通讯作者	Lim, Dhongil(oceanlim@kiost.ac.kr)
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.
关键词	Middle Eocene warmth Hg and Os isotopes Volcanism Continental weathering Site U1514
DOI	10.1016/j.epsl.2023.118565
收录类别	SCI
语种	英语
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
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001154761600001
出版者	ELSEVIER
WOS关键词	ATMOSPHERIC CO2 ; EARTHS CLIMATE ; HG ISOTOPES ; OCEAN ; OS-187/OS-188 ; RECORD ; CYCLE ; EVENT ; STRATIGRAPHY ; EVOLUTION
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/184414
专题	海洋地质与环境重点实验室
通讯作者	Lim, Dhongil
作者单位	1.Korea Inst Ocean Sci & Technol, Pusan 49111, South Korea 2.Univ Sci & Technol, Major Ocean Sci, Daejeon 34113, South Korea 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 4.Laoshan Lab, Lab Marine Geol, Qingdao 266061, Peoples R China 5.China Natl Offshore Oil Corp, Shenzhen Branch, Shenzhen 518000, Peoples R China 6.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 7.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China 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.