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Late Cretaceous (100-89 Ma) magnesian charnockites with adakitic affinities in the Milin area, eastern Gangdese: Partial melting of subducted oceanic crust and implications for crustal growth in southern Tibet

文献类型：期刊论文

作者Ma, Lin1,2; Wang, Qiang1; Wyman, Derek A.3; Li, Zheng-Xiang4,5; Jiang, Zi-Qi1; Yang, Jin-Hui6; Gou, Guo-Ning1,2; Guo, Hai-Feng1,2
刊名LITHOS
出版日期2013-08-15
卷号175页码:315-332
关键词Adakitic charnockite Slab melting Roll-back Crust growth Gangdese batholith Tibet
ISSN号0024-4937
DOI10.1016/j.lithos.2013.04.006
文献子类Article
英文摘要Rapid Mesozoic-Early Cenozoic crustal growth in the Gangdese area, southern Tibet, has commonly been attributed to pre-collisional and syn-collisional underplating of mantle-derived magmas. Here, we report on adakitic magnesian charnockites (i.e., hypersthene-bearing diorites and granodiorites) near Milin, in eastern Gangdese, that provide new insights into the crustal growth process of the region. Zircon U-Pb analyses of seven charnockite samples indicate that they were generated in the Late Cretaceous (100-89 Ma). They exhibit variable SiO2 (53.9 to 65.7 wt.%) contents, high Na2O/K2O (1.6 to 14.4) and Sr/Y (27.2 to 138.7) ratios, low Y (6.5 to 18.5 ppm), heavy rare earth element (e.g., Yb = 0.6 to 1.6 ppm) and Th (0.20-239 ppm) contents and Th/La (0.02-0.23) ratios, with relatively high Mg-# (46 to 56) and MgO (2.0 to 4.5 wt.%) values. They are characterized isotopically by high and slightly variable epsilon(Nd)(t) (+2.4 to +4.0) and epsilon(Hf)(t) (+10.1 to +15.8) values with relatively low and consistent (Sr-87/Sr-86); (0.7042 to 0.7043) ratios. Their pyroxenes have high crystallization temperatures (876 to 949 degrees C). The Milin charnockites were most probably produced by partial melting of subducted Neo-Tethyan oceanic crust that was followed by adakitic melt-mantle interaction, minor crustal assimilation and fractional crystallization of amphibole + plagioclase. The upwelling asthenosphere, triggered by the roll-back of subducted Neo-Tethyan oceanic lithosphere, provided the heat for slab melting. Therefore, we suggest that, in addition to pre-collisional and syn-collisional underplating of mantle-derived magmas, the recycling of subducted oceanic crust has also played an important role in continental crustal growth in southern Tibet. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.
WOS关键词U-PB GEOCHRONOLOGY ; TRONDHJEMITE-GRANODIORITE TTG ; HF ISOTOPE CONSTRAINTS ; INDO-ASIAN COLLISION ; CONTINENTAL-CRUST ; VOLCANIC-ROCKS ; TECTONIC EVOLUTION ; RIDGE SUBDUCTION ; MANTLE WEDGE ; GEOCHEMICAL CONSTRAINTS
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000322430800021
出版者ELSEVIER SCIENCE BV
资助机构Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; 41073029 ; 41073029 ; 41121002) ; 41121002)
源URL[http://ir.iggcas.ac.cn/handle/132A11/86752]  
专题中国科学院地质与地球物理研究所
通讯作者Wang, Qiang
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia
4.Curtin Univ, Dept Appl Geol, ARC Ctr Excellence Core Crust Fluid Syst CCFS, Perth, WA 6845, Australia
5.Curtin Univ, Dept Appl Geol, Inst Geosci Res TIGeR, Perth, WA 6845, Australia
6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Ma, Lin,Wang, Qiang,Wyman, Derek A.,et al. Late Cretaceous (100-89 Ma) magnesian charnockites with adakitic affinities in the Milin area, eastern Gangdese: Partial melting of subducted oceanic crust and implications for crustal growth in southern Tibet[J]. LITHOS,2013,175:315-332.
APA Ma, Lin.,Wang, Qiang.,Wyman, Derek A..,Li, Zheng-Xiang.,Jiang, Zi-Qi.,...&Guo, Hai-Feng.(2013).Late Cretaceous (100-89 Ma) magnesian charnockites with adakitic affinities in the Milin area, eastern Gangdese: Partial melting of subducted oceanic crust and implications for crustal growth in southern Tibet.LITHOS,175,315-332.
MLA Ma, Lin,et al."Late Cretaceous (100-89 Ma) magnesian charnockites with adakitic affinities in the Milin area, eastern Gangdese: Partial melting of subducted oceanic crust and implications for crustal growth in southern Tibet".LITHOS 175(2013):315-332.

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