中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 中国科学院矿产资源研究重点实验室
Neoproterozoic intrusions along the northern margin of South Qinling, central China: Geochemistry, zircon ages, and tectonic implications

文献类型：期刊论文

作者Nie, Hu1,2,4; Ye, Ri-Sheng2; Cheng, Hong2; Zhu, Xi-Yan3; Chen, Fukun2
刊名PRECAMBRIAN RESEARCH
出版日期2019-11-01
卷号334页码:16
关键词South Qinling Neoproterozoic Magmatism Zircon ages Nd-Ilf isotopes
ISSN号0301-9268
DOI10.1016/j.precamres.2019.105406
英文摘要We report whole-rock Sr-Nd isotopic compositions and U-Pb ages and Hf isotopic compositions of zircon grains from Neoproterozoic intrusive rocks exposed in northern South Qinling, central China. The rocks have diverse compositions and were emplaced at ca 751-714 Ma. On the basis of their distinct geochemical signatures, four compositional groups are recognized. High-Ti gabbros are tholeiitic, with low SiO2 and MgO, and high FeOT and TiO2 contents, and exhibit enrichment in large-ion-lithophile elements and absence of Nb and Ta negative anomalies. These gabbros have high epsilon(Nd)(t) values of + 1.9 to + 5.3 that are similar to the compositions of E-MORB or OIB, implying an origin from asthenospheric mantle. Low-Ti gabbros are calc-alkaline and have high SiO2 and MgO, and low FeOT and TiO2 contents. These gabbros have typical arc-like trace-element signatures and epsilon(Nd)(t) values that vary from - 3.2 to + 6.0, consistent with derivation from the partial melting of heterogeneous lithospheric mantle that was modified by subduction. Elemental and Nd-Hf isotopic compositions of Itype granitoids imply significant contributions from both mantle and crustal rocks. S-type granites originated from the partial melting of metasedimentary rocks with isotopic compositions similar to paragneisses of the basement in South Qinling. The extensive melting of both mantle and crustal rocks under relatively low pressures and high temperatures suggests an extensional environment during the Neoproterozoic. Our data, in combination with existing data from basement rocks and Neoproterozoic igneous rocks, constrain the crustal evolution of the northern Yangtze Block and South Qinling, in which subduction along the northern margin of the Yangtze Block prior to ca 800 Ma led to arc-continent collision, inducing high-grade metamorphism of the basement rocks of the Douling Complex. Subsequent protracted continental rifting was related to breakup of the supercontinent Rodinia.
WOS关键词U-PB GEOCHRONOLOGY ; HF ISOTOPIC COMPOSITION ; YANGTZE BLOCK ; OROGENIC BELT ; BREAK-UP ; I-TYPE ; EXPERIMENTAL CONSTRAINTS ; METAMORPHIC ZONE ; JIANGNAN OROGEN ; GRANITIC-ROCKS
资助项目National Nature Science Foundation of China[41703035] ; National Nature Science Foundation of China[41872049] ; National Nature Science Foundation of China[41372072]
WOS研究方向Geology
语种英语
WOS记录号WOS:000496875000004
出版者ELSEVIER
资助机构National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95726]  
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Ye, Ri-Sheng
作者单位1.Yangtze Univ, Coll Resources & Environm, Wuhan 430100, Hubei, Peoples R China
2.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Anhui, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.Yangtze Univ, Minist Educ, Key Lab Oil & Gas Resource & Explorat Technol, Wuhan 430100, Hubei, Peoples R China
推荐引用方式
GB/T 7714		 Nie, Hu,Ye, Ri-Sheng,Cheng, Hong,et al. Neoproterozoic intrusions along the northern margin of South Qinling, central China: Geochemistry, zircon ages, and tectonic implications[J]. PRECAMBRIAN RESEARCH,2019,334:16.
APA Nie, Hu,Ye, Ri-Sheng,Cheng, Hong,Zhu, Xi-Yan,&Chen, Fukun.(2019).Neoproterozoic intrusions along the northern margin of South Qinling, central China: Geochemistry, zircon ages, and tectonic implications.PRECAMBRIAN RESEARCH,334,16.
MLA Nie, Hu,et al."Neoproterozoic intrusions along the northern margin of South Qinling, central China: Geochemistry, zircon ages, and tectonic implications".PRECAMBRIAN RESEARCH 334(2019):16.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。