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Low delta O-18 magmas in the carboniferous intra-oceanic arc, central Tibet: Implications for felsic magma generation and oceanic arc accretion

文献类型：期刊论文

作者Dan, Wei1,2; Wang, Qiang1,2,3; Li, Xian-Hua3,4; Tang, Gong-Jian1,2; Zhang, Chunfu5; Zhang, Xiu-Zheng1; Wang, Jun1
刊名LITHOS
出版日期2019-02-01
卷号326页码:28-38
关键词Oxygen isotopes Felsic magmas Intra-Oceanicarc Arc accretion Qiangtang Paleo-Tethys
ISSN号0024-4937
DOI10.1016/j.lithos.2018.12.011
英文摘要Low-delta O-18 magmas (delta O-18(zircon) <4.7 parts per thousand) are rare but significant compared to the more abundant high-delta O-18 magmas in diverse tectonic settings. Here, we report mantle-like delta O-18 lavas and low-delta O-18 granites from the Carboniferous Riwanchaka intra-oceanic arc of the Qiangtang Terrane, central Tibet. SIMS (secondary ion mass spectroscopy) zircon U-Pb dating indicates that they were formed simultaneously at similar to 350 Ma, slightly younger than the Early Carboniferous ophiolites (similar to 355 Ma). The forearc ophiolites and volcanic rock assemblages constitute an intra-oceanic subduction system, evidenced by their similar Sr-Nd isotopes. SIMS zircon O isotope analyses indicate that the felsic rocks have delta O-18(zircon) values similar to or lower than that of the mantle. The dacite and trondhjemite samples have homogeneous delta O-18(zircon) values of 5.1 +/- 0.4 parts per thousand (2SD) and 4.6 +/- 0.5 parts per thousand (2SD), respectively. The tonalite samples exhibit a large range of delta O-18(zircon) values from 2.7 to 5.0 parts per thousand most of which are lower than the mantle-like value of 5.3 +/- 0.6 parts per thousand (2SD). We suggest that the dacites and trondhjemites were produced by partial melting of unaltered lower crust, whereas the low-delta O-18 tonalites originated by melting of hydrothermally altered lower crust, and both were generated in the early stage of this intra-oceanic arc. This process resulted in a weak middle arc crust of intermediate composition. By allowing decoupling of upper and lower arc crust, this plays an important role in the accretion of intra-oceanic arcs to continents and ultimately in the crustal growth. (C) 2018 Elsevier B.V. All rights reserved.
WOS关键词O ISOTOPE EVIDENCE ; U-PB AGE ; OXYGEN ISOTOPES ; NORTHERN TIBET ; SILICIC MAGMAS ; CONTINENTAL GROWTH ; CENTRAL QIANGTANG ; VOLCANIC-ROCKS ; ZIRCON MEGACRYSTS ; WORKING REFERENCE
资助项目National Key R&D Program of China[2016YFC0600407] ; Chinese Academy of Sciences[QYZDJ-SSW-DQC026] ; Chinese Academy of Sciences[XDA2007030402] ; National Natural Science Foundation of China[41573027] ; National Natural Science Foundation of China[41630208] ; National Natural Science Foundation of China[41673033] ; National Natural Science Foundation of China[41722205] ; GIGCAS 135 project[135TP201601] ; Key Program of Guangzhou City[201707020032]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000458942700003
出版者ELSEVIER SCIENCE BV
资助机构National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; GIGCAS 135 project ; GIGCAS 135 project ; Key Program of Guangzhou City ; Key Program of Guangzhou City ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; GIGCAS 135 project ; GIGCAS 135 project ; Key Program of Guangzhou City ; Key Program of Guangzhou City ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; GIGCAS 135 project ; GIGCAS 135 project ; Key Program of Guangzhou City ; Key Program of Guangzhou City ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; GIGCAS 135 project ; GIGCAS 135 project ; Key Program of Guangzhou City ; Key Program of Guangzhou City
源URL[http://ir.iggcas.ac.cn/handle/132A11/90697]  
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Dan, Wei
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
5.Ft Hays State Univ, Dept Geosci, Hays, KS 67601 USA
推荐引用方式
GB/T 7714		 Dan, Wei,Wang, Qiang,Li, Xian-Hua,et al. Low delta O-18 magmas in the carboniferous intra-oceanic arc, central Tibet: Implications for felsic magma generation and oceanic arc accretion[J]. LITHOS,2019,326:28-38.
APA Dan, Wei.,Wang, Qiang.,Li, Xian-Hua.,Tang, Gong-Jian.,Zhang, Chunfu.,...&Wang, Jun.(2019).Low delta O-18 magmas in the carboniferous intra-oceanic arc, central Tibet: Implications for felsic magma generation and oceanic arc accretion.LITHOS,326,28-38.
MLA Dan, Wei,et al."Low delta O-18 magmas in the carboniferous intra-oceanic arc, central Tibet: Implications for felsic magma generation and oceanic arc accretion".LITHOS 326(2019):28-38.

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来源：地质与地球物理研究所

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