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  5. 深海地质与地球化学研究室
Tectonic and magmatic evolution of the southernmost Mariana convergent margin: Constraints from geochronology and geochemistry of the Challenger Deep sediments

文献类型：期刊论文

作者Yang, Ming7; Wu, Tao5,6,7; Zhang, Wen4; Tian, Liyan3; Lu, Jianggu2; Song, Taoran1; Zhu, Hengrui6; Hong, Yidi6,7; Chen, Jiawang5
刊名LITHOS
出版日期2024-12-01
卷号488页码:10
关键词U - Pb ages In situ Sr and Hf isotopes Subduction initiation Challenger Deep Southernmost Mariana convergent margin
ISSN号0024-4937
DOI10.1016/j.lithos.2024.107796
英文摘要The southernmost Mariana convergent margin (SMCM) is a distinct segment of the Izu-Bonin-Mariana (IBM) subduction system with unique east-west orientation, however, its nature and tectonic history remains enigmatic. Here, for the first time, we present the detailed geochemical data of detrital minerals and UPb ages of accessory minerals from two sediment samples recovered at the deepest part of Southern Marianna Trench including the Challenger Deep. Detrital magmatic zircon UPb ages can be divided into three groups. Group 1 zircons show a weighted mean age of 50.3 +/- 1.2 Ma, contemporary to the published boninites from northern IBM. The epsilon(Hf)(t) of these zircons (11.1-16.4) are also similar to the boninites (12.6-16.8) and volcanic arc rocks (4.2-14.2), but lower than forearc basalts (17.8-22.1), suggesting that these zircons are from boninitic or arc magmatism. The apatite UPb dating obtained a similar age of 55.0 +/- 5.5 Ma. Therefore, if they are all from boninites, then subduction initiation magmatism ended at SMCM was likely coeval with northern IBM. Group 2 and Group 3 zircons have epsilon(Hf)(t) values similar to Group 1 zircons, but recorded younger Pb-206/U-238 ages of 16.8 +/- 1.8 Ma and 11.0 +/- 0.2 Ma, respectively, which are most likely related to the arc volcanism at West Mariana Ridge (WMR). Additionally, a rutile age of 19.0 +/- 0.6 Ma is identified, which is also likely related to WMR. The chemical composition and calculated P-T conditions of clinopyroxenes indicate that they are mainly from the Mariana forearc basalts and arc volcanic rocks. In situ Sr isotopic compositions of plagioclases also show strong affinity to the Mariana forearc basalts and arc volcanic rocks. Therefore, our study indicates that sediments at the deep trench can record the long-term tectonic and magmatic evolution of the convergent margin.
WOS关键词IZU-BONIN-MARIANA ; CLINOPYROXENE COMPOSITION ; PHILIPPINE SEA ; ELEMENT GEOCHEMISTRY ; TRACE-ELEMENTS ; ARC ; SUBDUCTION ; TROUGH ; LAVAS ; RIDGE
资助项目Hainan Observation and Research Station of Ecological Environment and Fishery Resource in Yazhou Bay ; National Key Research and Development Program of China[2023YFF0803404] ; National Natural Science Foundation of China[42072069] ; National Natural Science Foundation of China[42303025] ; National Natural Science Foundation of China[42372072] ; Hainan Provincial Natural Science Foundation of China[424RC531] ; Hainan Institute, Zhejiang University[0212-6602-A12201]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:001315557400001
出版者ELSEVIER
资助机构Hainan Observation and Research Station of Ecological Environment and Fishery Resource in Yazhou Bay ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; Hainan Provincial Natural Science Foundation of China ; Hainan Institute, Zhejiang University
源URL[http://ir.idsse.ac.cn/handle/183446/11362]  
专题深海科学研究部_深海地质与地球化学研究室
通讯作者Wu, Tao
作者单位1.Hainan Trop Ocean Univ, Coll Marine Sci & Technol, Sanya 572000, Peoples R China
2.Minist Nat Resources, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou, Peoples R China
3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
5.Donghai Lab, Zhoushan, Peoples R China
6.Zhejiang Univ, Ocean Coll, Zhoushan 316021, Peoples R China
7.Zhejiang Univ, Hainan Inst, Sanya 572025, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Ming,Wu, Tao,Zhang, Wen,et al. Tectonic and magmatic evolution of the southernmost Mariana convergent margin: Constraints from geochronology and geochemistry of the Challenger Deep sediments[J]. LITHOS,2024,488:10.
APA Yang, Ming.,Wu, Tao.,Zhang, Wen.,Tian, Liyan.,Lu, Jianggu.,...&Chen, Jiawang.(2024).Tectonic and magmatic evolution of the southernmost Mariana convergent margin: Constraints from geochronology and geochemistry of the Challenger Deep sediments.LITHOS,488,10.
MLA Yang, Ming,et al."Tectonic and magmatic evolution of the southernmost Mariana convergent margin: Constraints from geochronology and geochemistry of the Challenger Deep sediments".LITHOS 488(2024):10.

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来源：深海科学与工程研究所

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