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Initial subduction-related magmatism in southern Alaska identified by geochemistry and zircon Hf-O isotopes

文献类型：期刊论文

作者Yang, Jin-Hui1,3; Wang, Hao3; Chung, Sun-Lin2; Zhu, Yu-Sheng3; Cole, Ronald4
刊名SCIENCE BULLETIN
出版日期2021-05-30
卷号66期号:10页码:1030-1036
关键词Initial subduction Arc magmatism Zircon Hf-O isotopes Subduction of the Paleo-Pacific oceanic plate
ISSN号2095-9273
DOI10.1016/j.scib.2021.01.016
英文摘要Abundant arc-type magmatic and metamorphic rocks exist on Earth today, which provide insights into the equilibrium state of the subduction process. However, magmatic samples generated during the initial stage of subduction is largely unknown. This hinders our understanding of the subduction initiation process and by inference, the onset of plate tectonics as well as the history of crustal formation. To address this issue, we carried out a comprehensive geochemical-geochronological study of a suite of Late Triassic to mid-Jurassic plutonic rocks from southern Alaska that potentially represent magmas from the initial to mature stages of arc formation. While all studied samples show typical arc-type geochemical signatures, i.e., enrichment of large ion lithophile elements (LILEs) and depletion of high field strength elements (HFSEs) relative to the heavy rare earth elements (HREEs), the Late Triassic trondhjemites show unique geochemical features such as strongly positive eHf(t) and eNd(t) coupled with lower d18O (average 4.77 & permil;+/- 0.09 & permil;). These signatures, along with its higher zircon saturation temperatures compared with younger plutonic rocks, are best explained by shallow partial melting of subducting high-temperature hydrothermally altered lower oceanic crust (i.e., gabbro). If true, these surprising findings would open up new ways to study subduction initiation which would have important bearing on future research on the onset of global plate tectonics and the formation of the continental crust. (c) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
WOS关键词COPPER RIVER-BASIN ; OCEANIC-CRUST ; TECTONIC EVOLUTION ; CHUGACH MOUNTAINS ; KODIAK ISLANDS ; ARC ; WRANGELLIA ; TERRANES ; ORIGIN ; MANTLE
资助项目National Natural Science Foundation of China[41688103] ; Ministry of Science and Technology of China[2016YFC0600109]
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:000651153600012
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/101240]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Yang, Jin-Hui
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Acad Sinica, Inst Earth Sci, Taipei 11529, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Allegheny Coll, Dept Geol, Meadville, PA 16335 USA
推荐引用方式
GB/T 7714		 Yang, Jin-Hui,Wang, Hao,Chung, Sun-Lin,et al. Initial subduction-related magmatism in southern Alaska identified by geochemistry and zircon Hf-O isotopes[J]. SCIENCE BULLETIN,2021,66(10):1030-1036.
APA Yang, Jin-Hui,Wang, Hao,Chung, Sun-Lin,Zhu, Yu-Sheng,&Cole, Ronald.(2021).Initial subduction-related magmatism in southern Alaska identified by geochemistry and zircon Hf-O isotopes.SCIENCE BULLETIN,66(10),1030-1036.
MLA Yang, Jin-Hui,et al."Initial subduction-related magmatism in southern Alaska identified by geochemistry and zircon Hf-O isotopes".SCIENCE BULLETIN 66.10(2021):1030-1036.

入库方式： OAI收割

来源：地质与地球物理研究所

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