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Zircon U-Pb ages and O-Nd isotopic composition of basement rocks in the North Qinling Terrain, central China: evidence for provenance and evolution

文献类型：期刊论文

作者Liu, Bing-Xiang1,2; Qi, Yue1; Wang, Wei3; Siebel, Wolfgang4; Zhu, Xi-Yan5; Nie, Hu1; He, Jian-Feng1; Chen, Fukun1,2
刊名INTERNATIONAL JOURNAL OF EARTH SCIENCES
出版日期2013-11-01
卷号102期号:8页码:2153-2173
关键词North Qinling Precambrian Provenance Zircon O-sr-nd Isotopes
DOI10.1007/s00531-013-0912-6
文献子类Article
英文摘要The Qinling Group was previously interpreted as the oldest Precambrian basement unit of the North Qinling Terrain, recording its formation and early crustal evolution. The Qinling Group consists predominantly of gneisses, amphibolites, and marbles, which underwent multi-phase deformation and metamorphism. In order to better constrain the provenance and tectonic setting of this group and the evolution of the North Qinling orogenic belt, in situ U-Pb dating and oxygen isotopic analysis of zircons in combination with whole-rock geochemistry and Sr-Nd isotope analysis was performed on the two dominant rock types, amphibolite and felsic gneiss. Felsic gneisses exhibit enrichment of LREEs and LILEs (Rb, Ba, Th, K, Pb), negative Eu anomalies and depletion of HFSEs (Nb, Ta, P, Ti). The rocks have slightly elevated delta O-18 values (6.5-9.3 aEuro degrees) and initial epsilon (Nd) values of -4.6 corresponding to two-stage Nd model age of 1.99 Ga. Amphibolites are also enriched in LILEs and LREEs and depleted in Nb and Ta and have homogeneous delta O-18 values (5.0-6.0 aEuro degrees), but higher initial epsilon (Nd) values (2.8-3.3) and younger two-stage Nd model ages (1.29-1.24 Ga) compared to the gneisses. The zircon age record indicates that the gneisses and amphibolites were formed in a similar to 960 Ma volcanic arc environment rather than in a rift setting as previously suggested. A major metamorphic event took place during the Early Paleozoic. Based on the age spectrum of detrital zircons, the Qinling Group is interpreted as an autonomous geological unit, which was mainly derived mostly from 1,000 to 900 Ma old granitoid rocks. The North Qinling Terrain can be regarded as a remnant of the Grenville orogenic belt with an early Neoproterozoic evolution different from that of the North and South China blocks.
WOS关键词ULTRAHIGH-PRESSURE METAMORPHISM ; EARLY PALEOZOIC METAMORPHISM ; OROGENIC BELT ; SOUTH CHINA ; TECTONIC EVOLUTION ; DETRITAL ZIRCONS ; YANGTZE BLOCK ; ICP-MS ; VOLCANIC-ROCKS ; HF ISOTOPES
WOS研究方向Geology
语种英语
WOS记录号WOS:000325804900005
资助机构Ministry of Science and Technology of China(2012CB416606) ; Ministry of Science and Technology of China(2012CB416606) ; National Natural Science Foundation of China(40973042 ; National Natural Science Foundation of China(40973042 ; State Key Laboratory of Geodynamics, Northwest University in Xi'an ; State Key Laboratory of Geodynamics, Northwest University in Xi'an ; Chinese Academy of Sciences Visiting Professorship for Senior International Scientists(2011T2S39) ; Chinese Academy of Sciences Visiting Professorship for Senior International Scientists(2011T2S39) ; 41090372 ; 41090372 ; 41202140) ; 41202140) ; Ministry of Science and Technology of China(2012CB416606) ; Ministry of Science and Technology of China(2012CB416606) ; National Natural Science Foundation of China(40973042 ; National Natural Science Foundation of China(40973042 ; State Key Laboratory of Geodynamics, Northwest University in Xi'an ; State Key Laboratory of Geodynamics, Northwest University in Xi'an ; Chinese Academy of Sciences Visiting Professorship for Senior International Scientists(2011T2S39) ; Chinese Academy of Sciences Visiting Professorship for Senior International Scientists(2011T2S39) ; 41090372 ; 41090372 ; 41202140) ; 41202140)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62621]  
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
作者单位1.Univ Sci & Technol China, Sch Earth & Space Sci, Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
2.NW Univ Xian, State Key Lab Continental Dynam, Xian 710069, Peoples R China
3.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
4.Univ Tubingen, Dept Geosci, D-72074 Tubingen, Germany
5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Bing-Xiang,Qi, Yue,Wang, Wei,et al. Zircon U-Pb ages and O-Nd isotopic composition of basement rocks in the North Qinling Terrain, central China: evidence for provenance and evolution[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2013,102(8):2153-2173.
APA Liu, Bing-Xiang.,Qi, Yue.,Wang, Wei.,Siebel, Wolfgang.,Zhu, Xi-Yan.,...&Chen, Fukun.(2013).Zircon U-Pb ages and O-Nd isotopic composition of basement rocks in the North Qinling Terrain, central China: evidence for provenance and evolution.INTERNATIONAL JOURNAL OF EARTH SCIENCES,102(8),2153-2173.
MLA Liu, Bing-Xiang,et al."Zircon U-Pb ages and O-Nd isotopic composition of basement rocks in the North Qinling Terrain, central China: evidence for provenance and evolution".INTERNATIONAL JOURNAL OF EARTH SCIENCES 102.8(2013):2153-2173.

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来源：地质与地球物理研究所

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