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Magnesium isotopic behaviors between metamorphic rocks and their associated leucogranites, and implications for Himalayan orogenesis

文献类型：期刊论文

作者Tian, Shihong3,4,5; Hou, Zengqian2; Chen, Xinyang3; Tian, Hengci7; Gong, Yingli1; Yang, Zhusen4; Huang, Tianyi3; Li, Xianfang4; Mo, Xuanxue6
刊名GONDWANA RESEARCH
出版日期2020-11-01
卷号87页码:23-40
ISSN号1342-937X
关键词Magnesium isotopes Leucogranites Metamorphic rocks Indian lower crust Tectonic-magmatic-metamorphic evolution of the Himalayan orogeny
DOI10.1016/j.gr.2020.06.006
英文摘要Magnesium isotopic compositions, along with new Sr-Nd-Pb isotopic data and elemental analyses, are reported for 12 Miocene tourmaline-bearing leucogranites, 15 Eocene two-mica granites and 40 metamorphic rocks to investigate magnesium isotopic behaviors during metamorphic processes and associated magmatism and constrain the tectonic-magmatic-metamorphic evolution of the Himalayan orogeny. The gneisses, granulites and amphibolites represent samples of the Indian lower crust and display large range in delta Mg-26 from -0.44 parts per thousand to -0.09 parts per thousand in mafic granulites, -011 parts per thousand to -0.10 parts per thousand in amphibolites, and -0.70 parts per thousand to -0.03 parts per thousand in granitic gneisses. The average Mg isotopic compositions of the granitic gneisses (-0.19 +/- 0.34 parts per thousand), mafic granulites (-0.22 +/- 0.17 parts per thousand) and amphibolites (-0.25 +/- 0.24 parts per thousand are similar, indicating the limited Mg isotope fractionation during prograde metamorphism from granitic gneisses to mafic granulites and retrograde metamorphism from mafic granulites to amphibolites. The Eocene two-mica granites and Miocene leucogranites are characterized by large variations in elemental and Sr-Nd-Pb isotopic compositions. The leucogranites and two-mica granites have their corresponding (Sr-87/Sr-86) ; varying from 0.7282 to 0.7860 and 0.7163 to 0.7191, (Nd-143/Nd-144)(i) from 0.511888 to 0.512040 and 0.511953 to 0.512076, Pb-207/Pb-204 from 15.7215 to 15.7891 and 15.7031 to 15.7317, Pb-208/Pb-204 from 38.8521 to 39.5286 and 39.2710 to 39.4035, and Pb-206/Pb-204 from 18.4748 to 19.0139 and 18.7834 to 18.9339. However, they have similar Mg isotopic compositions ( -0.21 parts per thousand to +0.06 parts per thousand versus -0.24 parts per thousand to -0.09 parts per thousand), which did not originate from fractional crystallization nor source heterogeneity. Based on hornblende/biotite/muscovite dehydration melting reaction and Mg isotopic variations in two-mica granites and leucogranites with the proceeding metamorphism, along with elemental discrimination diagrams, Eocene two-mica granites and Miocene leucogranites could be related to hornblende dehydration melting and muscovite dehydration melting, respectively. Mg isotopic compositions of Eocene two-mica granites become heavier compared to the source because of residues of isotopically light garnet in the source; while those of Miocene leucogranites become lighter because of entrainment of isotopically light garnet from the source region. Thus, a new model for crustal anatexis and Himalayan orogenesis was proposed based on the Mg isotope fractionation in the leucogranites and metamorphic rocks. This model emphasizes a successive process from Indian continental subduction to rapid exhumation of the Higher Himalayan Crystalline Series (HHCS). The former underwent high-temperature (HT) and high-pressure (HP) granulite-facies prograde metamorphism, which resulted in the hornblende dehydration melting and the formation of Eocene two-mica granites; while the latter experienced amphibolite-facies retrogression and decompression, which resulted in the muscovite dehydration melting and the formation of Miocene leucogranites. (C) 2020 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
WOS关键词GRANULITE-FACIES METAMORPHISM ; HIGH-PRESSURE GRANULITES ; TETHYAN HIMALAYA ; SOUTHERN TIBET ; TECTONIC EVOLUTION ; CONTINENTAL-CRUST ; NAMCHE BARWA ; TRACE-ELEMENT ; MANTLE SOURCE ; FLUID-ABSENT
资助项目Natural Science Foundation of China[41773014] ; Natural Science Foundation of China[41729001] ; Natural Science Foundation of China[41320104004] ; Natural Science Foundation of China[41373014] ; National Key Research and Development Project of China[2016YFC0600310] ; East China University of Technology[1410000425] ; China Scholarship Council[201708110007] ; Chinese Academy of Geological Sciences[YYWF201606]
WOS研究方向Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:000572412000002
资助机构Natural Science Foundation of China ; Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; East China University of Technology ; East China University of Technology ; China Scholarship Council ; China Scholarship Council ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; East China University of Technology ; East China University of Technology ; China Scholarship Council ; China Scholarship Council ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; East China University of Technology ; East China University of Technology ; China Scholarship Council ; China Scholarship Council ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; East China University of Technology ; East China University of Technology ; China Scholarship Council ; China Scholarship Council ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/98257]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Tian, Shihong
作者单位1.Tsinghua Univ, Dept Energy & Power Engn, Beijing 100084, Peoples R China
2.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
3.Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
4.Chinese Acad Geol Sci, Inst Mineral Resources, MNR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China
5.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Jiangxi, Peoples R China
6.China Univ Geosci, Sch Earth Sci & Mineral Resources, Beijing 10083, Peoples R China
7.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Tian, Shihong,Hou, Zengqian,Chen, Xinyang,et al. Magnesium isotopic behaviors between metamorphic rocks and their associated leucogranites, and implications for Himalayan orogenesis[J]. GONDWANA RESEARCH,2020,87:23-40.
APA Tian, Shihong.,Hou, Zengqian.,Chen, Xinyang.,Tian, Hengci.,Gong, Yingli.,...&Mo, Xuanxue.(2020).Magnesium isotopic behaviors between metamorphic rocks and their associated leucogranites, and implications for Himalayan orogenesis.GONDWANA RESEARCH,87,23-40.
MLA Tian, Shihong,et al."Magnesium isotopic behaviors between metamorphic rocks and their associated leucogranites, and implications for Himalayan orogenesis".GONDWANA RESEARCH 87(2020):23-40.

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