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SEM-CL Study of Quartz Containing Fluid Inclusions in Wangjiazhuang Porphyry Copper (-Molybdenum) Deposit, Western Shandong, China

  • Petrology, Geochemistry and Ore Deposits
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Abstract

The Wangjiazhuang porphyry copper (-molybdenum) deposit is located at Zouping volcanic basin in Shandong Province, East China and hosted in the Wangjiazhuang intrusive complex emplaced along a late volcanic conduit. There are two types of ores in this deposit: early disseminated and stockwork ores in the ore-bearing intrusion, and late massive sulfide-quartz veins above brecciated quartz monzonite. The ore minerals are mainly pyrite, chalcopyrite, and subordinately magnetite, tennantite, molybdenite with minor bornite, enargite, galena and sphalerite, etc., and gangue minerals including K-feldspar, biotite, quartz, muscovite-sericite, chlorite and calcite. Combined with fluid inclusion study, the scanning electron microscope-cathodoluminescence (SEM-CL) study of quartz in the deposit and wall rocks shows significant differences between the two types of quartz in the ores. In addition, four types of primary-pseudosecondary fluid inclusions in the quartz have been recognized. They are one- or two-phase aqueous inclusions with vapor/liquid ratios less than 30% to 40% (type I); gas-rich inclusions with vapor/ liquid ratios more than 50% (type II), some of which contain some small opaque minerals, probably chalcopyrite; multiphase fluid inclusions with daughter minerals of halite±anhydrite±opaque (chalcopyrite)± sylvite±hematite±unknown crystal (type III); and mica-bearing fluid inclusions (type IV). Quartz containing abundant muscovite-bearing and halite-bearing fluid inclusions in the mineralized quartz monzonite with potassic-silicic alteration, have better oscillatory growth zoning with CL-colors from bright in the core to darker in the rim, indicating variations of element concentrations in the fluid media from which quartz grew during the later period of magmatic-hydrothermal process. In contrast, the quartz in the sulfide-quartz veins contains mainly fluid inclusions of low-to-medium salinities and does not show oscillatory zoning, indicating that there was less fluctuation in composition and element concentrations of the hydrothermal fluids. However, the quartz containing halite-bearing fluid inclusions and being associated with copper-molybdenum mineralization in the sulfide-quartz veins shows zoning in its rims, indicating variations in composition and element concentrations of the hydrothermal fluids.

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Acknowledgments

We thank Prof. Chen Li from Peking University for assistance with the scanning electron microscope analysis. This study was financially supported by the Key R & D Program of China (No. 2016YFC0600606), the Key R & D Program of Shandong Province (Nos. 2017CXGC1601, 2017CXGC1602, 2017CXGC1603), the National Natural Science Foundation of China (Nos. 41140025, 41672084, 41372086, 41503038) and the Special Fund for “Taishan Scholars” Project in Shandong Province. The final publication is available at Springer via https://doi.org/10.1007/s12583-019-1025-3.

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  1. Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology, Qingdao, 266590, China

    Lei Shu & Renchao Yang

  2. MLR Key Laboratory of Gold Mineralizaiton Processes and Resources Utilization, Key Laboratory of Metallogenic-Geologic Processes and Comprehensive Utilization of Minerals Resources of Shandong Province, Shandong Institute of Geological Sciences, Jinan, 250013, China

    Lei Shu, Kun Shen, Yingxin Song, Yuqin Sun, Wei Shan & Yuxin Xiong

  3. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China

    Renchao Yang

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  1. Lei Shu
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Correspondence to Renchao Yang.

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Shu, L., Shen, K., Yang, R. et al. SEM-CL Study of Quartz Containing Fluid Inclusions in Wangjiazhuang Porphyry Copper (-Molybdenum) Deposit, Western Shandong, China. J. Earth Sci. 31, 330–341 (2020). https://doi.org/10.1007/s12583-019-1025-3

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