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Origin of the Late Jurassic to Early Cretaceous peraluminous granitoids in the northeastern Hunan province (middle Yangtze region), South China: Geodynamic implications for the Paleo-Pacific subduction

文献类型：期刊论文

作者Ji, Wenbin1,2; Lin, Wei1; Faure, Michel2; Chen, Yan2; Chu, Yang1; Xue, Zhenhua1
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2017-06-15
卷号141页码:174-193
关键词South China Late Mesozoic tectono-magmatism Peraluminous granitoids Geochronology and petrogenesis Paleo-Pacific subduction
ISSN号1367-9120
DOI10.1016/j.jseaes.2016.07.005
文献子类Article
英文摘要The Late Mesozoic granitic belt in the northeastern Hunan province (situated in the south of the middle Yangtze region) represents the western front of the large magmatic province of SE China. In order to determine their ages and petrogenesis, we carried out zircon U-Pb dating, Hf isotope and whole-rock geochemical analyses for four granitic plutons, namely Taohuashan, Dayunshan-Mufushan, Wangxiang and Lianyunshan. Our SIMS zircon U-Pb ages, together with previously published data, reveal that the magmatic activities in this area can be roughly subdivided into three phases at 151-146 Ma, 132-127 Ma and ca. 117 Ma, and the Dayunshan-Mufushan batholith therein is a composite pluton. These four plutons are mainly composed of weakly to strongly peraluminous biotite or two-mica monzogranites, with a minor amount of biotite granodiorites. Their geochemical features are similar to S-type as well as fractionated S-type granites, with enrichment in LREEs and negative Ba, Sr, Nb, P and Ti anomalies. All samples show negative zircon epsilon Hf(t) values ranging from -12.5 to -3.6, corresponding to crustal Hf model (T-DM(C)) ages of 1.4-2.0 Ga. It is inferred that these granitoids were derived from partial melting of metasedimentary rocks analogous to the Neoproterozoic Lengjiaxi Group, predominantly with psammitic component. Fractional crystallization probably played an important role in the magma evolution, while input of mantle-derived magma was insignificant. Combined with other geological evidence, our new data allow us to propose that the Cretaceous (132-127 Ma and ca. 117 Ma) magmatism might be response to episodic slab rollback of the Paleo-Pacific plate, while the early-stage (151-146 Ma) magmatism that overlapped the epilogue of Jurassic magmatic flare-up and subsequent magmatic quiescence probably foreshadowed the transformation from foundering of a subducted flat-slab to slab rollback. Alternatively, slab foundering after a SE-directed intracontinental subduction in the central SCB cannot be ruled out for geodynamic interpretation of the Jurassic magmatism in SE China. (C) 2016 Elsevier Ltd. All rights reserved.
WOS关键词U-PB GEOCHRONOLOGY ; HF ISOTOPIC COMPOSITIONS ; A-TYPE GRANITES ; MESOZOIC TECTONIC EVOLUTION ; DETRITAL ZIRCON AGES ; S-TYPE GRANITES ; VOLCANIC-ROCKS ; EASTERN CHINA ; INTRACONTINENTAL OROGEN ; RIDGE SUBDUCTION
WOS研究方向Geology
语种英语
WOS记录号WOS:000404708500012
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China(41225009 ; National Natural Science Foundation of China(41225009 ; 41502202 ; 41502202 ; 41302161) ; 41302161) ; National Natural Science Foundation of China(41225009 ; National Natural Science Foundation of China(41225009 ; 41502202 ; 41502202 ; 41302161) ; 41302161) ; National Natural Science Foundation of China(41225009 ; National Natural Science Foundation of China(41225009 ; 41502202 ; 41502202 ; 41302161) ; 41302161) ; National Natural Science Foundation of China(41225009 ; National Natural Science Foundation of China(41225009 ; 41502202 ; 41502202 ; 41302161) ; 41302161)
源URL[http://ir.iggcas.ac.cn/handle/132A11/50665]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Lin, Wei
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Orleans, Inst Sci Terre Orleans, UMR 7327, CNRS, F-45071 Orleans, France
推荐引用方式
GB/T 7714		 Ji, Wenbin,Lin, Wei,Faure, Michel,et al. Origin of the Late Jurassic to Early Cretaceous peraluminous granitoids in the northeastern Hunan province (middle Yangtze region), South China: Geodynamic implications for the Paleo-Pacific subduction[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,141:174-193.
APA Ji, Wenbin,Lin, Wei,Faure, Michel,Chen, Yan,Chu, Yang,&Xue, Zhenhua.(2017).Origin of the Late Jurassic to Early Cretaceous peraluminous granitoids in the northeastern Hunan province (middle Yangtze region), South China: Geodynamic implications for the Paleo-Pacific subduction.JOURNAL OF ASIAN EARTH SCIENCES,141,174-193.
MLA Ji, Wenbin,et al."Origin of the Late Jurassic to Early Cretaceous peraluminous granitoids in the northeastern Hunan province (middle Yangtze region), South China: Geodynamic implications for the Paleo-Pacific subduction".JOURNAL OF ASIAN EARTH SCIENCES 141(2017):174-193.

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来源：地质与地球物理研究所

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