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The Baiyunchanghe A-type granites in Guyang area, Inner Mongolia: Age, geochemistry, Hf isotope and response to the breakup of Columbia supercontinent

文献类型：期刊论文

作者Kang JianLi1,2,3; Wang HuiChu1,3; Ren YunWei1,3; Xiao ZhiBin1,3; Xiang ZhenQun1,3; Zeng Le1,3
刊名ACTA PETROLOGICA SINICA
出版日期2020
卷号36期号:8页码:2431-2446
关键词A-type granite Petrogenesis Tectonic environment Baiyunchanghe mountain Columbia supercontinent
ISSN号1000-0569
DOI10.18654/1000-0569/2020.08.10
英文摘要Based on detailed field investigation upon the Baiyunchanghe granites, a comprehensive study of their petrography, geochemistry, zircon U-Pb geochronology and Hf isotope was carried out. The major elements of the Baiyunchanghe granites are high in SiO2 (70.68% similar to 77.21%), ALK (7.88% similar to 9.21% ), Fe2O3T/MgO (12.60 similar to 90.38 ) and 10000 x Ga/Al (3.63 similar to 6.17), low in Al2O3 (11.70% similar to 13.23%), MgO (0.06% similar to 0.24% ) and CaO (0.23% similar to 1.20%). The trace elements are rich in incompatible elements such as Rb, Th, K, and poor in Ba, Sr, Eu, Ti, P. All samples are enriched in LREE and depleted in HREE with obvious right-dipping seagull-shaped distribution and negative Eu anomaly. Calculated zircon saturated temperatures of the Baiyunchanghe granites range from 824 similar to 957 degrees C (averaged at 903 degrees C), which demonstrates they were formed in high temperature environment. Combined with the geochemical characteristics above, the Baiyunchanghe granites should be defined as A-type granite. LA-ICP-MS zircon U-Pb dating from the granite yields crystallization age with similar to 1720Ma. Most epsilon(Hf) ( t) values of the zircons are positive (-1.84 similar to +6.08) and Hf model/Dm, ages of 1.9 similar to 2.2Ga and t(DM2) ages of 2.5 similar to 3.2Ga, which indicates the magma was derived from the Neoarchean juvenile crust and may be contaminated by ancient crustal materials when upwelling. Al-type granites showed in the diagrams of tectonic setting discrimination with the characteristics of intraplate magma imply that the Baiyunchanghe granites were most likely the products of continental rifting magmatism. Based on the regional documented geochronology data, the Baiyunchanghe granites should be regarded as the earliest rocks with solid isotopic age related to the breakup of Columbia supercontinent in Yinshan Block.
WOS关键词NORTH CHINA CRATON ; ZIRCON U-PB ; MAFIC DYKE SWARMS ; GEOLOGICAL SIGNIFICANCE ; SOUTHERN MARGIN ; MESOPROTEROZOIC SUPERCONTINENT ; RAPAKIVI GRANITE ; XIONGER GROUP ; HUADE GROUP ; YB CONTENTS
WOS研究方向Geology
语种英语
WOS记录号WOS:000598101800010
出版者SCIENCE PRESS
源URL[http://ir.iggcas.ac.cn/handle/132A11/99867]  
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Kang JianLi
作者单位1.China Geol Surrey, Precambrian Geol Res Ctr, Tianjin 300170, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.China Geol Survey, Tianjin Ctr, Tianjin 300170, Peoples R China
推荐引用方式
GB/T 7714		 Kang JianLi,Wang HuiChu,Ren YunWei,et al. The Baiyunchanghe A-type granites in Guyang area, Inner Mongolia: Age, geochemistry, Hf isotope and response to the breakup of Columbia supercontinent[J]. ACTA PETROLOGICA SINICA,2020,36(8):2431-2446.
APA Kang JianLi,Wang HuiChu,Ren YunWei,Xiao ZhiBin,Xiang ZhenQun,&Zeng Le.(2020).The Baiyunchanghe A-type granites in Guyang area, Inner Mongolia: Age, geochemistry, Hf isotope and response to the breakup of Columbia supercontinent.ACTA PETROLOGICA SINICA,36(8),2431-2446.
MLA Kang JianLi,et al."The Baiyunchanghe A-type granites in Guyang area, Inner Mongolia: Age, geochemistry, Hf isotope and response to the breakup of Columbia supercontinent".ACTA PETROLOGICA SINICA 36.8(2020):2431-2446.

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来源：地质与地球物理研究所

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