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Petrogenesis of the Middle Triassic Erenhot granitoid batholith in central Inner Mongolia (northern China) with tectonic implication for the Triassic Mo mineralization in the eastern Central Asian Orogenic Belt
Yuan, Lingling1,2; Zhang, Xiaohui1
2018-10-01
发表期刊JOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
卷号165页码:37-58
摘要Voluminous post-orogenic magmatism holds a key to monitoring important geodynamic processes and crustal evolution within an extensional accretionary orogen. The Middle Triassic Erenhot granitoid batholith from central Inner Mongolia, northern China, is tectonically located in the eastern Central Asian Orogenic Belt. This batholith consists of monzogranite, syenogranite, alkali-feldspar granite and albite granite with minor mafic to felsic enclaves and dykes. The formation of this composite batholith involved distinct mafic and felsic magma end-members, concomitant episodic mafic-felsic interaction and intra-felsic magma evolution. Mafic (diabasic) and high-Mg intermediate (dioritic) dykes show enrichment in large ion lithophile elements, depletion in high field strength elements and heterogeneous isotopic compositions, indicative of a metasomatized lithospheric mantle source inherited from prior oceanic slab subduction. The monzogranites and aplites have arc-like elemental features and variable isotopic compositions (I-sr(t) = 0.706132, epsilon(Nd)(t) = -0.4, zircon epsilon(Hf)(t) = 2.8 to 7.4, zircon delta O-18 = 5.32 to 6.74 parts per thousand), clearly suggesting that the felsic magma end-member of a dual heritage was derived from dominant newly-underplated mafic crust and subordinate ancient lower crust. Hybridization processes between mantle-derived mafic magma and crust-derived felsic magma result in the formation of monzonitic enclaves (I-sr(t) = 0.704850, epsilon(Nd)(t) = -0.1) with an isotopic resemblance to the host granites. Fractional crystallization of the monzogranitic magmas endows the differentiated syenogranites and alkali-feldspar granites with highly evolved elemental characteristics. We further deduce that the magmatic immiscibility between K-rich and Na-rich residual melts in a deep reservoir produces albite granites with distinct deformation imprints, variable K2O contents and wide range of crystallization temperatures. Combining with coeval regional igneous episodes as well as concomitant sedimentary and structural events in the northern China-Mongolia tract, the Triassic Erenhot composite batholith can be considered as post-orogenic magmatic products possibly within a coupled geodynamic scenario between lithospheric dripping and concurrent gravitational collapse. Therefore, the documentation of this large-scale Triassic post-orogenic magmatism could not only lead to the characterization of the eventual closure of the Paleo-Asian Ocean, but also capture a snapshot into the tectonic background for the widespread porphyry-type Mo mineralization in the eastern Central Asian Orogenic Belt during early Mesozoic.
关键词Middle Triassic Granitoid batholith Geochemistry Northern China Central Asian Orogenic Belt
DOI10.1016/j.jseaes.2017.10.011
资助者National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
关键词[WOS]A-TYPE GRANITES ; SOLONKER SUTURE ZONE ; K CALC-ALKALINE ; FELSIC MAGMA INTERACTION ; DUCTILE SHEAR ZONES ; TETRAD REE PATTERNS ; U-PB GEOCHRONOLOGY ; VOLCANIC-ROCKS ; SLAB BREAKOFF ; NE CHINA
语种英语
资助项目National Natural Science Foundation of China[41390443] ; National Natural Science Foundation of China[41173043] ; National Natural Science Foundation of China[41573031]
资助者National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000449447300003
出版者PERGAMON-ELSEVIER SCIENCE LTD
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89448
专题岩石圈演化国家重点实验室
通讯作者Zhang, Xiaohui
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
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Yuan, Lingling,Zhang, Xiaohui. Petrogenesis of the Middle Triassic Erenhot granitoid batholith in central Inner Mongolia (northern China) with tectonic implication for the Triassic Mo mineralization in the eastern Central Asian Orogenic Belt[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,165:37-58.
APA Yuan, Lingling,&Zhang, Xiaohui.(2018).Petrogenesis of the Middle Triassic Erenhot granitoid batholith in central Inner Mongolia (northern China) with tectonic implication for the Triassic Mo mineralization in the eastern Central Asian Orogenic Belt.JOURNAL OF ASIAN EARTH SCIENCES,165,37-58.
MLA Yuan, Lingling,et al."Petrogenesis of the Middle Triassic Erenhot granitoid batholith in central Inner Mongolia (northern China) with tectonic implication for the Triassic Mo mineralization in the eastern Central Asian Orogenic Belt".JOURNAL OF ASIAN EARTH SCIENCES 165(2018):37-58.
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