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Geology, geochronology and geochemistry of large Duobaoshan Cu-Mo-au orefield in NE China: Magma genesis and regional tectonic implications

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Geoscience Frontiers 2021年第1期12卷 265-292页

作者： Wen-yan Cai Ke-yong Wang Jian Li Li-juan Fu Chun-kit Lai Han-lun Liu College of Earth Sciences Jilin UniversityChangchun 130061China College of Geology and Mining Engineering Xinjiang UniversityUrumqi 830047China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Land and Resources of ChinaChangchun 130061China Technical Information Department Inner Mongolia Shandong Gold Geological Minerals Survey Co.Ltd.Chifeng 024000China Faculty of Science Universiti Brunei DarussalamGadongBrunei Darussalam

Duobaoshan is the largest porphyry-related Cu-Mo-au orefield in northeastern(NE)Asia,and hosts a number of large-medium porphyry Cu(PCDs),epithermal au and Fe-Cu skarn *** ages of these deposits,from the oldest(Ordovician)to youngest(Jurassic),have spanned across over 300 *** similar orefields of such size and geological complexity are found in NE Asia,which reflects its metallogenic uniqueness in forming and preserving porphyry-related *** this study,we explore the actual number and timing of magmatic/mineralization phases,their respective magma genesis,fertility,and regional tectonic connection,together with the preservation of *** present new data on the magmatic/mineralization ages(LA-ICP-MS zircon U-Pb,pyrite and molybdenite Re-Os dating),whole-rock geochemistry,and zircon trace element compositions on four representative deposits in the Duobaoshan orefield,i.e.,Duobaoshan PCD,Tongshan PCD,Sankuanggou Fe-Cu skarn,and Zhengguang epithermal au deposits,and compiled published ones from these and other mineral occurrences in the *** terms of geochronology,we have newly summarized seven magmatic phases in the orefield:(1)Middle-Late Cambrian(506-491 Ma),(2)Early and Middle Ordovician(485-471 Ma and~462 Ma),(3)Late Ordovician(450-447 Ma),(4)Early Carboniferous and Late-Carboniferous to Early Permian(351-345 and 323-291 Ma),(5)Middle-Late Triassic(244-223 Ma),(6)Early-Middle and Late Jurassic(178-168 Ma and~150 Ma),and(7)Early Cretaceous(~112 Ma).Three of these seven major magmatic phases were coeval with ore formation,including(1)Early Ordovician(485-473 Ma)porphyry-type Cu-Mo-(au),(2)Early-Middle Triassic(246-229 Ma)porphyry-related epithermal au-(Cu-Mo),and(3)Early Jurassic(177-173 Ma)Fe-Cu skarn *** deposits in the orefield,notably Tongshan and Zhengguang,were likely formed by more than one mineralization *** terms of geochemistry,ore-causative granitoids in the orefield exhibit adakite-like or adakite-nor

关键词： Duobaoshan Cu-Mo-au orefield(NE China) Porphyry Cu deposit epithermal au deposit Paleo-Asian Ocean Central Asian Orogenic Belt(CAOB)

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