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Genesis of the Weiquan ag-polymetallic deposit in East Tianshan, China： Evidence from Zircon U-Pb Geochronology and C-H-O-S-Pb Isotope Systematics

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Acta Geologica Sinica(English Edition) 2018年第3期92卷 1100-1122页

作者： DING Hui GE Wensheng DONG Lianhui ZHANG Liangliang CHEN Xiaodong LIU Yan NIE Junjie School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China Xinjiang Bureau of Geology and Mineral Resources Uriimqi 830000 China The Sixth Exploration Institute of Geology and Mineral Resources of Shandong Province Weihai 264209Shandong China Chengdu University of Technology Chengdu 610059 China MCC Capital Engineering & Research Incorporation Limited (CERI) Beijing 100176 China No. 1 Geological Party Xinjiang Bureau of Geology and MineralResources Changji 831100 Xinjiang China

The Weiquan ag-polymetallic deposit is located on the southern margin of the Central Asian Orogenic Belt and in the western segment of the Aqishan-Yamansu arc belt in East Tianshan,northwestern China. Its orebodies, controlled by faults, occur in the lower Carboniferous volcanosedimentary rocks of the Yamansu Formation as irregular veins and lenses. Four stages of mineralization have been recognized on the basis of mineral assemblages, ore fabrics, and crosscutting relationships among the ore veins. Stage I is the skarn stage(garnet + pyroxene), Stage Ⅱ is the retrograde alteration stage(epidote + chlorite + magnetite ± hematite 士 actinolite ± quartz),Stage Ⅲ is the sulfide stage(ag and Bi minerals + pyrite + chalcopyrite + galena + sphalerite + quartz ± calcite ± tetrahedrite),and Stage IV is the carbonate stage(quartz + calcite ± pyrite). skarnization,silicification, carbonatization,epidotization,chloritization, sericitization, and actinolitization are the principal types of hydrothermal alteration. LAICP-MS U-Pb dating yielded ages of 326.5±4.5 and 298.5±1.5 Ma for zircons from the tuff and diorite porphyry, respectively. Given that the tuff is wall rock and that the orebodies are cut by a late diorite porphyry dike, the ages of the tuff and the diorite porphyry provide lower and upper time limits on the age of ore formation. The δ13C values of the calcite samples range from-2.5‰ to 2.3‰, the δ18OH2 Oand δDVSMOWvalues of the sulfide stage(Stage Ⅲ) vary from 1.1‰ to 5.2‰ and-111.7‰ to-66.1‰, respectively,and the δ13C, δ18OH2 Oand δDV-SMOWvalues of calcite in one Stage IV sample are 1.5‰,-0.3‰, and-115.6‰, respectively. Carbon, hydrogen, and oxygen isotopic compositions indicate that the ore-forming fluids evolved gradually from magmatic to meteoric sources. The δ34SV-CDTvalues of the sulfides have a large range from-6.9‰ to 1.4‰, with an average of-2.2‰, indicating a magmatic source, possibly with sedimentary contributions. The206Pb/204Pb,207Pb/204Pb, and208Pb/204

关键词： zircon U-Pb geochronology C-H-O-S-Pb isotopes skarn-type ag-polymetallic deposit Weiquan East Tianshan China

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