IGGCAS OpenIR  > 岩石圈演化国家重点实验室
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
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume165Pages:37-58
AbstractVoluminous 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.
KeywordMiddle Triassic Granitoid batholith Geochemistry Northern China Central Asian Orogenic Belt
DOI10.1016/j.jseaes.2017.10.011
Funding OrganizationNational 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 KeywordA-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
Language英语
Funding ProjectNational Natural Science Foundation of China[41390443] ; National Natural Science Foundation of China[41173043] ; National Natural Science Foundation of China[41573031]
Funding OrganizationNational 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 Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000449447300003
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/89448
Collection岩石圈演化国家重点实验室
Corresponding AuthorZhang, Xiaohui
Affiliation1.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
Recommended Citation
GB/T 7714
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Yuan, Lingling]'s Articles
[Zhang, Xiaohui]'s Articles
Baidu academic
Similar articles in Baidu academic
[Yuan, Lingling]'s Articles
[Zhang, Xiaohui]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Yuan, Lingling]'s Articles
[Zhang, Xiaohui]'s Articles
Terms of Use
No data!
Social Bookmark/Share
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit Add to Technorati
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.