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  4. 岩石圈演化国家重点实验室
B isotopes reveal Eocene melange melting in northern Tibet during continental subduction

文献类型：期刊论文

作者Ma, Lin4,5,6; Gou, Guo-Ning6; Kerr, Andrew C.4; Wang, Qiang3,5,6; Wei, Gang-Jian5,6; Yang, Jin-Hui2; Shen, Xiao-Ming1,6
刊名LITHOS
出版日期2021-07-01
卷号392页码:13
ISSN号0024-4937
DOI10.1016/j.lithos.2021.106146
英文摘要Continental subduction is an important but poorly known means of transporting the Earth's crust into the mantle. Continental subduction has also been proposed to responsible for the formation of the Cenozoic intracontinental potassic rocks widespread in Tibet and uplift of the Tibetan Plateau. However, such ancient continental subduction only occasionally been identified and is controversial. In this contribution, we explore the use of boron and its isotopes, to provide new constraints on the origin of newly identified Eocene potassium-rich volcanic rocks in northern Tibet and potential subduction of continental crust. Our results indicate that the latest Eocene (ca. 34 Ma) potassium-rich volcanic rocks are characterised by moderate silica, adakite-like trace elements, enriched Sr-Nd-Pb and light boron isotope (delta B-11=-20.12% to -7.95%) signatures. This isotopically light signature of boron suggests a melange source composed of mantle wedge peridotite and recycled dehydrated continental crust. The Eocene potassium-rich magmas were likely derived from low-degree partial melting of diapir melange at high-pressure and medium temperature within subduction channel. Our work indicates potential obduction of the Tibetan plate over the Asian plate thus triggering intracontinental subduction before the end of Eocene. This continental obduction may have accommodated a huge amount of crustal material during Cenozoic rapid convergence between India and Asia. We conclude that during this process an isotopically light component is likely to have been transported into the mantle to form a distinct source region. B isotopes therefore have the potential to trace the continental crust recycling in large collisional orogens. (C) 2021 Elsevier B.V. All rights reserved.
WOS关键词RICH MAFIC MAGMATISM ; BORON ISOTOPE ; TRACE-ELEMENT ; PLATEAU IMPLICATIONS ; LAVAS IMPLICATIONS ; MANTLE SOURCE ; CONSTRAINTS ; CRUST ; EVOLUTION ; VOLCANISM
资助项目National Natural Science Foundation of China[41630208] ; National Natural Science Foundation of China[91855215] ; National Natural Science Foundation of China[41872062] ; Second Tibetan Plateau Scientific Expedition and Research (STEP)[2019QZKK0702] ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences[XDA2007030402] ; National Key Research and Development Project of China[2016YFC0600309] ; Youth Innovation Promotion Association CAS[2017404]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:000648452000005
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/101177]  
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Wang, Qiang
作者单位1.Natl Inst Nat Hazards, Minist Emergency Management China, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Cardiff Univ, Sch Earth & Environm Sci, Cardiff CF10 3AT, Wales
5.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China
6.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
推荐引用方式
GB/T 7714		 Ma, Lin,Gou, Guo-Ning,Kerr, Andrew C.,et al. B isotopes reveal Eocene melange melting in northern Tibet during continental subduction[J]. LITHOS,2021,392:13.
APA Ma, Lin.,Gou, Guo-Ning.,Kerr, Andrew C..,Wang, Qiang.,Wei, Gang-Jian.,...&Shen, Xiao-Ming.(2021).B isotopes reveal Eocene melange melting in northern Tibet during continental subduction.LITHOS,392,13.
MLA Ma, Lin,et al."B isotopes reveal Eocene melange melting in northern Tibet during continental subduction".LITHOS 392(2021):13.

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来源：地质与地球物理研究所

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