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Abstract:
Located in the southwestern Fujian Province, the Tongkeng ore deposit in Liancheng is a newly discovered molybdenum deposit. The molybdenum mineralization occurs within the contact zone between the granite porphyry stock formed in the first stage of late Yanshanian magmatic event in Tongkeng area and late Paleozoic metamorphic rocks. Ore bodies are charactered by vein, veinlet and disseminated. Re-Os dating of six molybdenite samples collected from the major ore body shows that the isochron age is (115.7±1.1) Ma and the model ages range from 115.1 Ma to 116.7 Ma, with an average value of (115.8±0.8) Ma. It can be considered that both the granite-porphyry and associated molybdenum mineralization were formed in Early Cretaceous, and that both were derived by the late Yanshanian tectonic-magmatic event in the southwestern Fujian depression. Combined with isotopic age data from other adjacent molybdenum deposits, it can be inferred that the early Yanshanian large-scale molybdenum mineralization in the southwestern Fujian depression formed during the transition stage from the Indosinian sustained platform to active continental margin, and accompanied by compressing and uplifting in early Yanshanian (about 160-145 Ma); the late Yanshanian tectonic conversion from compressing to tension (about 125-105 Ma) resulted in the magmatism which seemed to be the dominant factor for the late Yanshanian molybdenum deposit. ©, 2015, Jilin University Press. All right reserved.
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Journal of Jilin University (Earth Science Edition)
ISSN: 1671-5888
CN: 22-1343/P
Year: 2015
Issue: 1
Volume: 45
Page: 119-131
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 1
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