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Petrogenesis and Geodynamic Implications of Late Jurassic Diorite Porphyry in the Neoproterozoic Ophiolitic Melange of NE Jiangxi (South China)

文献类型：期刊论文

作者Wang Xinshui5,6; Gao Jun4,5,6; Li Jilei3,5,6; Jiang Tuo2; Xue Shengchao1
刊名ACTA GEOLOGICA SINICA-ENGLISH EDITION
出版日期2018-06-01
卷号92期号:3页码:1008-1023
关键词adakite flat-slab subduction Mesozoic NE Jiangxi South China Block
ISSN号1000-9515
DOI10.1111/1755-6724.13588
英文摘要Mesozoic magmatism is widespread in the eastern South China Block and has a close genetic relationship with intensive polymetallic mineralization. However, proper tectonic driver remains elusive to reconcile the broad intracontinental magmatic province. This study presents integrated zircon U-Pb dating, Hf isotopes and whole-rock geochemistry of the Xiwan dioritic porphyry in the NE Jiangxi ophiolitic melange. Zircon U-Pb dating by SIMS and LA-ICP-MS methods yielded an emplacement age of approximate to 160 Ma for the Xiwan diorite, confirming its inclusion into the Mesozoic magmatic province in SE China, instead of a component of the Neoproterozoic ophiolitic melange genetically. The dioritic rocks have low SiO2 (58.08wt%-59.15wt%), and high Na2O (5.00wt%-5.21wt%) and MgO (4.60wt%-5.24wt%) contents with low TFeO/MgO ratios (1.02-1.09). They show an adakitic geochemical affinity but exhibit relatively low Sr/Y ratios (24.8-31.1) and high Y contents (14.6-18.3 ppm) compared to the Dexing adakitic porphyries. In addition, the Xiwan diorites have moderately evolved zircon Hf isotopic compositions (epsilon(Hf)(t)=-6.1- -0.1; T-DM2=1597-1219 Ma). These elemental and isotopic signatures suggest that the Xiwan diorite formed through partial melting of a remnant arc lower crust (i.e., early Neoproterozoic mafic arc-related rocks) in response to the underplating of coeval mafic magmas. In conjunction with the temporal-spatial distribution and complex geochemical characteristics of the Mesozoic magmatism, our case study attests to the feasibility of a flat-slab subduction model in developing the broad intracontinental magmatic province in SE China. The flat-slab delamination tends to trigger an asthenospheric upwelling and thus results in extensive partial melting of the overlying lithospheric mantle and lower crustal materials in an extensional setting during the Mesozoic.
WOS关键词ZIRCON U-PB ; CONTINENTAL COLLISION ZONES ; HF ISOTOPIC COMPOSITIONS ; SE CHINA ; SOUTHEASTERN CHINA ; TECTONIC EVOLUTION ; LOWER CRUST ; GEOCHEMICAL CONSTRAINTS ; EASTERN CHINA ; ORE-DEPOSITS
资助项目National Natural Science Foundation of China[41172200] ; China Geological Survey[12120113093900]
WOS研究方向Geology
语种英语
WOS记录号WOS:000438888600009
出版者WILEY
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey
源URL[http://ir.iggcas.ac.cn/handle/132A11/94024]  
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Gao Jun
作者单位1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.China Geol Survey, Wuhan Ctr, Lab Isotope Geochem, Wuhan 430205, Hubei, Peoples R China
3.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Wang Xinshui,Gao Jun,Li Jilei,et al. Petrogenesis and Geodynamic Implications of Late Jurassic Diorite Porphyry in the Neoproterozoic Ophiolitic Melange of NE Jiangxi (South China)[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2018,92(3):1008-1023.
APA Wang Xinshui,Gao Jun,Li Jilei,Jiang Tuo,&Xue Shengchao.(2018).Petrogenesis and Geodynamic Implications of Late Jurassic Diorite Porphyry in the Neoproterozoic Ophiolitic Melange of NE Jiangxi (South China).ACTA GEOLOGICA SINICA-ENGLISH EDITION,92(3),1008-1023.
MLA Wang Xinshui,et al."Petrogenesis and Geodynamic Implications of Late Jurassic Diorite Porphyry in the Neoproterozoic Ophiolitic Melange of NE Jiangxi (South China)".ACTA GEOLOGICA SINICA-ENGLISH EDITION 92.3(2018):1008-1023.

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来源：地质与地球物理研究所

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