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Research Article| December 01, 2017 U-Pb, Re-Os, AND 40Ar/39Ar GEOCHRONOLOGY OF PORPHYRY Sn ± Cu ± Mo AND POLYMETALLIC (Ag-Pb-Zn-Cu) VEIN MINERALIZATION AT BIANJIADAYUAN, INNER MONGOLIA, NORTHEAST CHINA: IMPLICATIONS FOR DISCRETE MINERALIZATION EVENTS Degao Zhai; Degao Zhai 1 State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China † Corresponding author: e-mail, dgzhai@cugb.edu.cn Search for other works by this author on: GSW Google Scholar Jiajun Liu; Jiajun Liu 1 State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Search for other works by this author on: GSW Google Scholar Anli Zhang; Anli Zhang 2 Lituo Mining Company, Chifeng 024000, China Search for other works by this author on: GSW Google Scholar Yinqiang Sun Yinqiang Sun 3 243 Team, China Nuclear Geology, Chifeng 024000, China Search for other works by this author on: GSW Google Scholar Economic Geology (2017) 112 (8): 2041–2059. https://doi.org/10.5382/econgeo.2017.4540 Article history accepted: 05 Sep 2017 first online: 15 Nov 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Degao Zhai, Jiajun Liu, Anli Zhang, Yinqiang Sun; U-Pb, Re-Os, AND 40Ar/39Ar GEOCHRONOLOGY OF PORPHYRY Sn ± Cu ± Mo AND POLYMETALLIC (Ag-Pb-Zn-Cu) VEIN MINERALIZATION AT BIANJIADAYUAN, INNER MONGOLIA, NORTHEAST CHINA: IMPLICATIONS FOR DISCRETE MINERALIZATION EVENTS. Economic Geology 2017;; 112 (8): 2041–2059. doi: https://doi.org/10.5382/econgeo.2017.4540 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEconomic Geology Search Advanced Search Abstract Many new discoveries of base and precious metal (Ag-Pb-Zn-Cu) veins in the Great Hinggan Range ore district have made this region the most important Ag-Pb-Zn metallogenic belt in northern China. The newly discovered Bianjiadayuan deposit, which is located in this district, is characterized by diverse mineralization types, including porphyry Sn ± Cu ± Mo, breccia Sn-Pb-Zn, and base metal veins. Geochronological studies have revealed two separate mineralization events. The earliest magmatic-hydrothermal event is recorded by two robust zircon U-Pb ages of 140.8 ± 0.9 and 140.2 ± 0.6 Ma for the quartz porphyry intrusion. These ages are indistinguishable, within error, from the mean Re-Os age of 140.0 ± 1.7 Ma for molybdenite veins/veinlets hosted by the porphyry. A slightly younger 40Ar/39Ar age of 138.7 ± 1.0 Ma was obtained for sericite in base and precious metal (Ag-Pb-Zn) veins hosted by slate adjacent to the porphyry. On the basis of the U-Pb, Re-Os, and 40Ar/39Ar data, we infer that the above mineralization occurred at ~140 Ma and was caused by fluids released from the magma that crystallized the quartz porphyry. A late hydrothermal event is evident from numerous Cu-Pb-Zn–mineralized veins hosted in a gabbro intrusion with zircon U-Pb ages of 133.2 ± 0.9 and 133.0 ± 0.8 Ma. The late base metal veins are interpreted to be coeval with or postdate diorite dikes that intruded both gabbro and slate; the diorite yielded a zircon U-Pb age of 130.0 ± 2.8 Ma. The discovery of separate but superimposed hydrothermal events has important implications for local and regional exploration. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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