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2090-2070 Ma A-type granitoids in Zanhuang Complex: Further evidence on a Paleoproterozoic rift-related tectonic regime in the Trans-North China Orogen

文献类型：期刊论文

作者Du, Lilin1,2; Yang, Chonghui1; Wyman, Derek A.2; Nutman, Allen P.3; Lu, Zenglong1; Song, Huixia1; Xie, Hangqiang1,4; Wan, Yusheng1,4; Zhao, Lei5; Geng, Yuansheng1
刊名LITHOS
出版日期2016-06-01
卷号254页码:18-35
关键词The Xuting pluton Zanhuang Complex Zircon Pb-207/Pb-206 ages Hf isotopes A-type granite Rift environment
DOI10.1016/j.lithos.2016.03.007
文献子类Article
英文摘要The Xuting pluton, located at the north section of the Zanhuang Complex, contains potassic and sodic granite in both of which shallow level emplacement is shown by graphic texture feldspar and quartz intergrowth. Two potassic granite and one sodic granite samples yielded zircon Pb-207/Pb-206 ages of 2066 +/- 17 Ma, 2092 +/- 14 Ma, and 2071 +/- 14 Ma, respectively, suggesting that the Xuting pluton emplaced between 2070 Ma and 2090 Ma, which is coeval with the Paleoproterozoic Gantaohe Group dominated by mafic volcanic and sedimentary rocks. The potassic granite is enriched in SiO2, total FeO, REEs (except Eu), Zr, Nb, Ga and Y, and depleted in MgO, CaO, Al2O3, Sr, V, Cr and Ni, with high TFeO/MgO ratios, consistent with the features of A-type granite. Except for the high MgO and low K2O contents, the sodic granite also presents most of the features of A-type granites. The zircon saturation temperatures from the potassic and sodic granites range from 855 to 998 degrees C and 853 to 933 degrees C respectively, indicating that they are from the high temperature magma. The potassic granites have the epsilon(Hf)(t) ranging from -5.9 to +133 and Hf model ages of 2.5-2.8 Ga, which are identical with the ages of Neoarchean TTG gneisses in the Zanhuang Complex. We propose that the potassic granite in the Xuting pluton derived from the partial melting of Neoarchean TTG gneisses. The sodic granites also present negative epsilon(Hf)(t) values from -4.81 to -0.76 and Hf model ages of 2.5-2.8 Ga, suggesting that they come from the partial melting of the Neoarchean crust. However, with relative enrichment in MgO and total FeO, and lower K2O and Rb, the sodic granite was derived from a mafic source in the lower crust. The likely heat source was high heatflow associated with mantle upwelling. The A-type Xuting pluton and mafic volcanic rocks in the Gantaohe Group constitute a bimodal lithologic association from a Paleoproterozoic continental rift environment. 2.2-2.0 Ga magmas are widely distributed along the Trans-North China Orogen (TNCO), and also present a bimodal character. We propose that 22-2.0 Ga bimodal magmas throughout the TNCO were likely formed in a Paleoproterozoic rifting setting. Considering the widespread 2.2-2.0 Ga magmatic rocks in the North China Craton (NCC), we infer that the magmatism likely occurs in tensional environment after the initial amalgamation of the NCC in the late Archean. (c) 2016 Elsevier B.V. All rights reserved.
WOS关键词U-PB GEOCHRONOLOGY ; GRANULITIC METASEDIMENTARY ROCKS ; ANOROGENIC FELSIC MAGMATISM ; HIGH-PRESSURE GRANULITES ; LOWER CRUSTAL SECTION ; WUTAI MOUNTAINS AREA ; HF ISOTOPIC EVIDENCE ; KHETRI COPPER BELT ; LACHLAN FOLD BELT ; S-TYPE GRANITES
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000375888100002
资助机构National Natural Science Foundation of China(41172171) ; National Natural Science Foundation of China(41172171) ; China Scholarship Council(201409110015) ; China Scholarship Council(201409110015) ; China Geological Survey(12120114021501) ; China Geological Survey(12120114021501) ; National Commission on Stratigraphy of China(1212011120142) ; National Commission on Stratigraphy of China(1212011120142) ; National Natural Science Foundation of China(41172171) ; National Natural Science Foundation of China(41172171) ; China Scholarship Council(201409110015) ; China Scholarship Council(201409110015) ; China Geological Survey(12120114021501) ; China Geological Survey(12120114021501) ; National Commission on Stratigraphy of China(1212011120142) ; National Commission on Stratigraphy of China(1212011120142)
源URL[http://ir.iggcas.ac.cn/handle/132A11/53510]  
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.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
2.Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia
3.Univ Wollongong, Sch Earth & Environm Sci, GeoQuEST Res Ctr, Wollongong, NSW 2522, Australia
4.Beijing SHRIMP Ctr, Beijing 100037, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Du, Lilin,Yang, Chonghui,Wyman, Derek A.,et al. 2090-2070 Ma A-type granitoids in Zanhuang Complex: Further evidence on a Paleoproterozoic rift-related tectonic regime in the Trans-North China Orogen[J]. LITHOS,2016,254:18-35.
APA Du, Lilin.,Yang, Chonghui.,Wyman, Derek A..,Nutman, Allen P..,Lu, Zenglong.,...&Ren, Liudong.(2016).2090-2070 Ma A-type granitoids in Zanhuang Complex: Further evidence on a Paleoproterozoic rift-related tectonic regime in the Trans-North China Orogen.LITHOS,254,18-35.
MLA Du, Lilin,et al."2090-2070 Ma A-type granitoids in Zanhuang Complex: Further evidence on a Paleoproterozoic rift-related tectonic regime in the Trans-North China Orogen".LITHOS 254(2016):18-35.

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来源：地质与地球物理研究所

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