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  2. 地质与地球物理研究所
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  4. 中国科学院地球与行星物理重点实验室
Magnesium isotopic composition of the deep continental crust

文献类型：期刊论文

作者Yang, Wei1; Teng, Fang-Zhen2; Li, Wang-Ye3; Liu, Sheng-Ao4; Ke, Shan4; Liu, Yong-Sheng5; Zhang, Hong-Fu6; Gao, Shan5
刊名AMERICAN MINERALOGIST
出版日期2016
卷号101期号:1-2页码:243-252
关键词Magnesium isotope deep continental crust high-grade metamorphic terrane granulite xenolith Invited Centennial article
DOI10.2138/am-2016-5275
文献子类Article
英文摘要To constrain the behavior of Mg isotopes during deep crustal processes and the Mg isotopic composition of the middle and lower continental crust, 30 composite samples from high-grade metamorphic terranes and 18 granulite xenoliths were investigated. The composites derive from eight different high-grade metamorphic terranes in the two largest Archean cratons of China, including 13 TTG gneisses, 5 amphibolites, 4 felsic, 4 intermediate, and 4 mafic granulites. They have variable bulk compositions with SiO2 ranging from 45.7 to 72.5%, representative of the middle crust beneath eastern China. The delta Mg-26 values of these samples vary from -0.40 to +0.12%0, reflecting heterogeneity of their protoliths, which could involve upper crustal sediments. The granulite xenoliths from the Cenozoic Hannuoba basalts also have a diversity of compositions with MgO ranging from 2.95 to 20.2%. These xenoliths equilibrated under high temperatures of 800-950 degrees C, corresponding to depths of the lower continental crust (>30 km). They yield a large delta Mg-26 variation of -0.76 to 0.24 parts per thousand. The light Mg isotopic compositions likely result from interactions with isotopically light metamorphic fluids, probably carbonate fluids. Together with previously reported data, the average delta Mg-26 values of the middle and lower continental crusts are estimated to be 0.21 +/- 0. 07%o and 0.26 +/- 0.06 parts per thousand, respectively. The bulk continental crust is estimated to have an average delta Mg-26 of 0.24 +/- 0.07 parts per thousand, which is similar to the average of the mantle. The large Mg isotopic variation in the continental crust reflects the combination of several processes, such as continental weathering, involvement of supracrustal materials in the deep crust, and fluid metasomatism.
WOS关键词NORTH CHINA CRATON ; SINO-KOREAN CRATON ; MANTLE XENOLITHS ; YANGTZE CRATON ; FRACTIONATION ; MG ; SYSTEMATICS ; EVOLUTION ; HANNUOBA ; LITHIUM
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000370213500024
资助机构National Science Foundation of China(41173012 ; National Science Foundation of China(41173012 ; National Science Foundation of China(41173012 ; National Science Foundation of China(41173012 ; National Science Foundation(EAR-0838227 ; National Science Foundation(EAR-0838227 ; National Science Foundation(EAR-0838227 ; National Science Foundation(EAR-0838227 ; 41230209 ; 41230209 ; 41230209 ; 41230209 ; EAR-1056713 ; EAR-1056713 ; EAR-1056713 ; EAR-1056713 ; 41322022 ; 41322022 ; 41322022 ; 41322022 ; EAR1340160) ; EAR1340160) ; EAR1340160) ; EAR1340160) ; 41221002 ; 41221002 ; 41221002 ; 41221002 ; 41328004) ; 41328004) ; 41328004) ; 41328004) ; National Science Foundation of China(41173012 ; National Science Foundation of China(41173012 ; National Science Foundation of China(41173012 ; National Science Foundation of China(41173012 ; National Science Foundation(EAR-0838227 ; National Science Foundation(EAR-0838227 ; National Science Foundation(EAR-0838227 ; National Science Foundation(EAR-0838227 ; 41230209 ; 41230209 ; 41230209 ; 41230209 ; EAR-1056713 ; EAR-1056713 ; EAR-1056713 ; EAR-1056713 ; 41322022 ; 41322022 ; 41322022 ; 41322022 ; EAR1340160) ; EAR1340160) ; EAR1340160) ; EAR1340160) ; 41221002 ; 41221002 ; 41221002 ; 41221002 ; 41328004) ; 41328004) ; 41328004) ; 41328004)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62065]  
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
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
2.Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
3.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
5.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 10029, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Wei,Teng, Fang-Zhen,Li, Wang-Ye,et al. Magnesium isotopic composition of the deep continental crust[J]. AMERICAN MINERALOGIST,2016,101(1-2):243-252.
APA Yang, Wei.,Teng, Fang-Zhen.,Li, Wang-Ye.,Liu, Sheng-Ao.,Ke, Shan.,...&Gao, Shan.(2016).Magnesium isotopic composition of the deep continental crust.AMERICAN MINERALOGIST,101(1-2),243-252.
MLA Yang, Wei,et al."Magnesium isotopic composition of the deep continental crust".AMERICAN MINERALOGIST 101.1-2(2016):243-252.

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来源：地质与地球物理研究所

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