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Petrogenesis and tectonic implications of the late Paleoproterozoic A-type rhyolites at the southwestern North China Craton

文献类型：期刊论文

作者Pang, Lanyin2,7,8; Zhou, Yanyan3,4; Gao, Xinyu5; Deng, Xiaoqin1; Zhao, Junhong6; Zhao, Taiping2,7
刊名LITHOS
出版日期2021-06-01
卷号390页码:19
关键词Late Paleoproterozoic A-type rhyolite Low delta O-18 Rifting Southwestern North China Craton
ISSN号0024-4937
DOI10.1016/j.lithos.2021.106095
英文摘要The late Paleoproterozoic A-type granitoids are important for constraining of the lithotectonic and geodynamic processed involved in the creation of continental crust. The newly identified late Paleoproterozoic felsic extrusive rocks from the southwestern margin of the North China Craton (NCC) consist of rhyolites which show melting corrosion structure, autoclastic texture and fiber structure of mineral grains and have weightedmean SIMSzircon U-Pb ages of 1794.7 +/- 3.6 Ma to 1780.3 +/- 5.6 Ma. The rhyolite samples showhigh SiO2 (67.59-74.38 wt%) and K2O+ Na2O (3.68-11.10 wt%), and low MgO (0.05-1.17 wt%), CaO (0.19-2.58 wt%) and P2O5 (0.08-0.16 wt%). They display aluminous A-type granite/rhyolite geochemical compositions, such as high A/CNK (0.78-1.23), FeOT/(FeOT + MgO) (0.81-0.99) and 10000Ga/Al (2.32-4.03) ratios, and high Zr + Nb + Ce + Y (824-1272 ppm) concentrations, as well as high zirconium saturation temperatures (T-Zr= 873-964 degrees C). These signatures, along with their low epsilon(Hf)(t) (-3.6 to -1.5) and epsilon(Nd)(t) values (-4.31 to -3.31) and old two-stage Hf model ages (T-DM(C) = 2.70-2.57 Ga), indicate that the rhyolites were derived from partial melting of the Neoarchean felsic basement rocks. These volcanic rocks also have low zircon delta O-18 values ranging from 1.5% to 6.8%, which were inherited from the Neoarchean O-18-depleted basement rocks that underwent high-T hydrothermal alteration, rather than resulted from contamination or later high-T water/rock interaction. The rhyolite rocks in this study, the earliest igneous rocks in the southwesternNCC after the Paleoproterozoic consolidation of the crystalline basement, were formed in a rift setting, marking the initial breakup of the Guyuan Rift in the southwestern NCC. The rhyolite rocks in combination with the Xiong'er volcanic rocks in the southern NCC mark the initial rifting of theNCC (Xiong'er Rift and Guyuan Rift) after cratonization (similar to 1.85-1.8 Ga). The youngest retrograde metamorphism (1.80-1.79 Ga) in the NCC indicates that the transition from post-orogenic to intracontinental rift setting occurred at ca. 1.79 Ga. (c) 2021 Elsevier B.V. All rights reserved.
WOS关键词ZIRCON U-PB ; OXYGEN-ISOTOPE ; SOUTHERN MARGIN ; GEOCHEMICAL CONSTRAINTS ; WESTERN BLOCK ; IGNEOUS ROCKS ; HF ISOTOPES ; GRANITES ; ORIGIN ; MAGMA
资助项目National Natural Science Foundation of China[41630211]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000640920000003
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/101190]  
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Zhao, Taiping
作者单位1.Guangdong Acad Sci, Guangdong Inst Microbiol, Guangdong Prov Key Lab Microbial Culture Collect, State Key Lab Appl Microbiol Southern China, Guangzhou 510070, Peoples R China
2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
5.Guangdong Polytech Water Resources & Elect Engn, Guangzhou 510635, Peoples R China
6.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
7.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China
8.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Pang, Lanyin,Zhou, Yanyan,Gao, Xinyu,et al. Petrogenesis and tectonic implications of the late Paleoproterozoic A-type rhyolites at the southwestern North China Craton[J]. LITHOS,2021,390:19.
APA Pang, Lanyin,Zhou, Yanyan,Gao, Xinyu,Deng, Xiaoqin,Zhao, Junhong,&Zhao, Taiping.(2021).Petrogenesis and tectonic implications of the late Paleoproterozoic A-type rhyolites at the southwestern North China Craton.LITHOS,390,19.
MLA Pang, Lanyin,et al."Petrogenesis and tectonic implications of the late Paleoproterozoic A-type rhyolites at the southwestern North China Craton".LITHOS 390(2021):19.

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来源：地质与地球物理研究所

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