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Magnesium isotope constraints on subduction contribution to Mesozoic and Cenozoic East Asian continental basalts

文献类型：期刊论文

作者Su, Ben-Xun1,2,3; Hu, Yan2; Teng, Fang-Zhen2; Xiao, Yan4; Zhou, Xin-Hua4; Sun, Yang4; Zhou, Mei-Fu5; Chang, Su-Chin5
刊名CHEMICAL GEOLOGY
出版日期2017-09-05
卷号466页码:116-122
关键词Continental basalt East Asia Mantle wedge Mg isotopes Pacific subduction Slab
ISSN号0009-2541
DOI10.1016/j.chemgeo.2017.05.026
文献子类Article
英文摘要To better understand the influence of subduction on geochemical heterogeneity of the mantle, Mg isotope ratios were measured in a suite of continental basalts from East Asia. In contrast to global oceanic basalts (delta Mg-26 = -0.25 +/- 0.07%), these continental basalts display considerable Mg isotope variation that can be roughly related to the time and place of eruption. The Cenozoic basalts have slightly lower delta Mg-26 values (n = 32; -0.46 +/- 0.05 to -0.25 +/- 0.06%; average -0.38%) than the Mesozoic basalts (n= 12; -0.41 +/- 0.08 to -0.23 +/- 0.05%; average -0.30%) and display a decreasing delta Mg-26 trend with increasing distance from the present subduction trench, particularly for the basalts from South China Craton. Such variations may be related to westward subduction of Pacific oceanic plate beneath East Asia. Some outliers of Mg isotopic data in the North China Craton probably involve additional contributions from earlier subduction and collision from the south (Tethyan ocean and Yangtze Craton) and north (Paleo-Asian ocean). The correlations between delta Mg-26 and element indices (e.g., TiO2, Li/Y) of contributions of slab melt indicate input of a component from the slab that is progressively dehydrating in the source region. Highly variable Sr, Nd and Pb isotope ratios for a given delta Mg-26 value suggest continuous interaction rather than a simple binary mixing of the mantle with subduction components. Intra-continental magmatism in East Asian is thus derived from a mantle wedge affected by the ongoing subduction of the Pacific Plate. Mixing with the uniform Mg isotopic compositions of MORB and OIB sources, global mantle convection likely erases the enriched components, whereas mantle wedges might be able to retain some Mg isotope heterogeneity.
WOS关键词NORTH CHINA CRATON ; SE CHINA ; VOLCANIC-ROCKS ; MANTLE SOURCES ; TRACE-ELEMENT ; PB ISOTOPE ; FRACTIONATION ; LITHOSPHERE ; GEOCHEMISTRY ; ASTHENOSPHERE
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000407861200009
出版者ELSEVIER SCIENCE BV
资助机构National Science Foundation(EAR-1340160) ; National Science Foundation(EAR-1340160) ; National Natural Science Foundation of China(41173045) ; National Natural Science Foundation of China(41173045) ; National Science Foundation(EAR-1340160) ; National Science Foundation(EAR-1340160) ; National Natural Science Foundation of China(41173045) ; National Natural Science Foundation of China(41173045) ; National Science Foundation(EAR-1340160) ; National Science Foundation(EAR-1340160) ; National Natural Science Foundation of China(41173045) ; National Natural Science Foundation of China(41173045) ; National Science Foundation(EAR-1340160) ; National Science Foundation(EAR-1340160) ; National Natural Science Foundation of China(41173045) ; National Natural Science Foundation of China(41173045)
源URL[http://ir.iggcas.ac.cn/handle/132A11/61848]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Su, Ben-Xun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
5.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
推荐引用方式
GB/T 7714		 Su, Ben-Xun,Hu, Yan,Teng, Fang-Zhen,et al. Magnesium isotope constraints on subduction contribution to Mesozoic and Cenozoic East Asian continental basalts[J]. CHEMICAL GEOLOGY,2017,466:116-122.
APA Su, Ben-Xun.,Hu, Yan.,Teng, Fang-Zhen.,Xiao, Yan.,Zhou, Xin-Hua.,...&Chang, Su-Chin.(2017).Magnesium isotope constraints on subduction contribution to Mesozoic and Cenozoic East Asian continental basalts.CHEMICAL GEOLOGY,466,116-122.
MLA Su, Ben-Xun,et al."Magnesium isotope constraints on subduction contribution to Mesozoic and Cenozoic East Asian continental basalts".CHEMICAL GEOLOGY 466(2017):116-122.

入库方式： OAI收割

来源：地质与地球物理研究所

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