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Remagnetization of Permian Emeishan basalts: Constraints on the timing of native copper mineralization in northeast Yunnan Province, China

文献类型：期刊论文

作者Liu, Chengying1,2; Paterson, Greig A.3,4; Li, Shihu1; Pan, Yongxin3; Zhu, Rixiang1
刊名FRONTIERS IN EARTH SCIENCE
出版日期2021-01-14
卷号8页码:15
关键词Emeishan basalts paleomagnetic study remagnetization copper mineralization Early-Middle Jurassic
DOI10.3389/feart.2020.590939
英文摘要New paleomagnetic results from the Permian Emeishan basalts in the Zhaotong area, NE Yunnan province, China show four natural remanent magnetization components. Detailed stepwise thermal demagnetization of basaltic samples from 16 flows from the Dadi section, which represent basalt units III and IV, isolated two groups of characteristic remanent magnetizations. Samples in unit IV (five flows) record a southwest declination and a moderate downward inclination that is considered to be a partial remagnetized remanence. The bottom flows from unit III (11 flows) record a normal polarity direction, interpreted as a remagnetization, which yields a tilt-corrected mean direction of D-s/I-s = 8.8 degrees/31.6 degrees (N = 9, k(s) = 39.7, alpha (95) = 8.3 degrees), with a corresponding paleomagnetic pole at 77.1 degrees N, 240.0 degrees E (K = 49.2, A(95) = 7.4 degrees). The secondary directions have steeper inclinations than primary ones that have been successfully recovered from other studies in this area of the Emeishan basalts. By comparison with the Phanerozoic paleomagnetic poles of the South China Block, the preferred timing of remagnetization is the Lower-Middle Jurassic. Field relationships suggest that the remagnetization of the Emeishan basalts is coeval with the spatially related, but localized, copper mineralization. Thus the timing of the main copper mineralization hosted in the Emeishan basalts is hypothesized to occur in the Early-Middle Jurassic.
WOS关键词LARGE IGNEOUS PROVINCE ; FLOOD BASALTS ; SOUTH CHINA ; SW CHINA ; PALEOMAGNETIC CONSTRAINTS ; KEWEENAWAN ROCKS ; COLLISION ; GEOCHEMISTRY ; PETROGENESIS ; ERUPTION
资助项目National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities[lzujbky-2017-76] ; Natural Environment Research Council (NERC) Independent Research Fellowship[NE/P017266/1]
WOS研究方向Geology
语种英语
WOS记录号WOS:000612210500001
出版者FRONTIERS MEDIA SA
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 ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship ; Natural Environment Research Council (NERC) Independent Research Fellowship
源URL[http://ir.iggcas.ac.cn/handle/132A11/100043]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Liu, Chengying; Zhu, Rixiang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Lanzhou Univ, Sch Earth Sci, Key Lab Mineral Resources Western China Gansu Pro, Lanzhou, Peoples R China
3.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing, Peoples R China
4.Univ Liverpool, Dept Earth Ocean & Ecol Sci, Liverpool, Merseyside, England
推荐引用方式
GB/T 7714		 Liu, Chengying,Paterson, Greig A.,Li, Shihu,et al. Remagnetization of Permian Emeishan basalts: Constraints on the timing of native copper mineralization in northeast Yunnan Province, China[J]. FRONTIERS IN EARTH SCIENCE,2021,8:15.
APA Liu, Chengying,Paterson, Greig A.,Li, Shihu,Pan, Yongxin,&Zhu, Rixiang.(2021).Remagnetization of Permian Emeishan basalts: Constraints on the timing of native copper mineralization in northeast Yunnan Province, China.FRONTIERS IN EARTH SCIENCE,8,15.
MLA Liu, Chengying,et al."Remagnetization of Permian Emeishan basalts: Constraints on the timing of native copper mineralization in northeast Yunnan Province, China".FRONTIERS IN EARTH SCIENCE 8(2021):15.

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来源：地质与地球物理研究所

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