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

作　　者：Wen-yan Cai Ke-yong Wang Jian Li Li-juan Fu Chun-kit Lai Han-lun Liu 

机构地区：[1]College of Earth Sciences,Jilin University,Changchun 130061,China [2]College of Geology and Mining Engineering,Xinjiang University,Urumqi 830047,China [3]Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Land and Resources of China,Changchun 130061,China [4]Technical Information Department,Inner Mongolia Shandong Gold Geological Minerals Survey Co.Ltd.,Chifeng 024000,China [5]Faculty of Science,Universiti Brunei Darussalam,Gadong,Brunei Darussalam

出　　处：《Geoscience Frontiers》2021年第1期265-292,共28页地学前缘（英文版）

基　　金：funded by the China Geological Survey,the Chinese Ministry of Science and Technology(2017YFC0601304);the Cu-Mo-Au-Ag Metallogenic Regularity in Duobaoshan-Sankuanggou Belt Project(DT-2017-SJC-12)。

摘　　要：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 deposits.Formation ages of these deposits,from the oldest(Ordovician)to youngest(Jurassic),have spanned across over 300 Ma.No similar orefields of such size and geological complexity are found in NE Asia,which reflects its metallogenic uniqueness in forming and preserving porphyry-related deposits.In 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 PCDs.We 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 orefield.In 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 mineralization.Some deposits in the orefield,notably Tongshan and Zhengguang,were likely formed by more than one mineralization events.In terms of geochemistry,ore-causative granitoids in the orefield exhibit adakite-like or adakite-normal arc transitional signatures,but those formin

关 键 词：Duobaoshan Cu-Mo-Au orefield(NE China) Porphyry Cu deposit Epithermal Au deposit Paleo-Asian Ocean Central Asian Orogenic Belt(CAOB) 

分 类 号：P618.41[天文地球—矿床学] P618.65[天文地球—地质学] P618.51