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U–Pb and Ar–Ar geochronology of the Fujiawu porphyry Cu–Mo deposit, Dexing district, Southeast China: Implications for magmatism, hydrothermal alteration, and mineralization
Xiaofeng Li;  Ruizhong Hu;  Brian Rusk;  Rong Xiao;  Cuiyun Wang;  Feng Yang
2013
Source PublicationJournal of Asian Earth Sciences
Volume74Pages:330-342
Abstract

The Fujiawu porphyry Cu–Mo deposit is one of several porphyry Cu–Mo deposits in the Dexing district, Jiangxi Province, Southeast China. New zircon SHRIMP U–Pb data yield a weighted mean 206Pb/238U age of 172.0 ± 2.1 and 168.5 ± 1.4 Ma from weakly altered granodiorite porphyry and quartz diorite porphyry, respectively. Two hydrothermal biotites from granodiorite porphyry give an Ar–Ar step-heating plateau age of 169.9 ± 1.8 and 168.7 ± 1.8 Ma. Hydrothermal apatite exsolved from altered biotite yields an isotope dilution thermal ionization mass spectrometry isochron age of 164.4 ± 0.9 Ma. The apatite age is similar to the ages obtained from hydrothermal rutile (165.0 ± 1.1 and 164.8 ± 1.6 Ma) and indicates that the magmatism and hydrothermal activity in the Fujiawu deposit occurred in the Middle Jurassic. Hydrothermal fluid circulation related to multiple stages of magma emplacement resulted in Cu–Mo mineralization in the Fujiawu porphyry deposit. The zircon SHRIMP U–Pb ages and the published molybdenite Re–Os age (170.9 ± 1.5 Ma) represent the timing of magma crystallization and Mo mineralization, whereas the rutile and apatite U–Pb ages reflect the timing of Cu mineralization following quartz diorite emplacement. The data suggest slow cooling after emplacement of the quartz diorite porphyry.

KeywordGeochronology Zircon Apatite Rutile U–pb Age Biotite Ar–ar Cooling History Porphyry Cu–mo Deposit Fujiawu Se China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9414
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002, China
2.Western Washington University, Bellingham, WA, USA
3.Hunan Institute of Geological Survey, Changsha 410116, China
4.Guilin University of Technology, Guilin 541004, China
Recommended Citation
GB/T 7714
Xiaofeng Li;Ruizhong Hu;Brian Rusk;Rong Xiao;Cuiyun Wang;Feng Yang. U–Pb and Ar–Ar geochronology of the Fujiawu porphyry Cu–Mo deposit, Dexing district, Southeast China: Implications for magmatism, hydrothermal alteration, and mineralization[J]. Journal of Asian Earth Sciences,2013,74:330-342.
APA Xiaofeng Li;Ruizhong Hu;Brian Rusk;Rong Xiao;Cuiyun Wang;Feng Yang.(2013).U–Pb and Ar–Ar geochronology of the Fujiawu porphyry Cu–Mo deposit, Dexing district, Southeast China: Implications for magmatism, hydrothermal alteration, and mineralization.Journal of Asian Earth Sciences,74,330-342.
MLA Xiaofeng Li;Ruizhong Hu;Brian Rusk;Rong Xiao;Cuiyun Wang;Feng Yang."U–Pb and Ar–Ar geochronology of the Fujiawu porphyry Cu–Mo deposit, Dexing district, Southeast China: Implications for magmatism, hydrothermal alteration, and mineralization".Journal of Asian Earth Sciences 74(2013):330-342.
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