Geological Characteristics and Zircon U‐Pb Dating of Volcanic Rocks from the Beizhan Iron Deposit in Western Tianshan Mountains,Xinjiang, NW China |
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| Authors: | ZHANG Zuoheng HONG Wei JIANG Zongsheng DUAN Shigang XU Lingang LI Fengming GUO Xincheng ZHAO Zhengang |
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| Institution: | 1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Faculty of Geosciences and Resources, China University of Geosciences, Beijing 100083, China;3. The Bureau of Geology and Mineral Resources Development of Xinjiang, ürümqi 830000, China;4. No. 11 Unit of the Bureau of Geology and Mineral Resources Development of Xinjiang, Changji 831100, China |
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| Abstract: | The Beizhan large iron deposit located in the east part of the Awulale metallogenic belt in the western Tianshan Mountains is hosted in the Unit 2 of the Dahalajunshan Formation as lens, veinlets and stratoid, and both of the hanging wall and footwall are quartz‐monzonite; the dip is to the north with thick and high‐grade ore bodies downwards. Ore minerals are mainly magnetite with minor sulfides, such as pyrite, pyrrhotite, chalcopyrite and sphalerite. Skarnization is widespread around the ore bodies, and garnet, diopside, wollastonite, actinolite, epidote, uralite, tourmaline sericite and calcite are ubiquitous as gangues. Radiating outwards from the center of the ore body the deposit can be classified into skarn, calcite, serpentinite and marble zones. LA‐ICP‐MS zircon U‐Pb dating of the rhyolite and dacite from the Dahalajunshan Formation indicates that they were formed at 301.3±0.8 Ma and 303.7±0.9 Ma, respectively, which might have been related to the continental arc magmatism during the late stage of subduction in the western Tianshan Mountains. Iron formation is genetically related with volcanic eruption during this interval. The Dahalajunshan Formation and the quartz‐monzonite intrusion jointly control the distribution of ore bodies. Both ore textures and wall rock alteration indicate that the Beizhan iron deposit is probably skarn type. |
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| Keywords: | iron ore Zircon U‐Pb dating skarnization Beizhan Western Tianshan Mountains |
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