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Volume 31 Issue 2
Apr 2020
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Journal of Earth Science  > 2020  >  31(2): 330-341.
Lei Shu, Kun Shen, Renchao Yang, Yingxin Song, Yuqin Sun, Wei Shan, Yuxin Xiong. SEM-CL Study of Quartz Containing Fluid Inclusions in Wangjiazhuang Porphyry Copper (-Molybdenum) Deposit, Western Shandong, China. Journal of Earth Science, 2020, 31(2): 330-341. doi: 10.1007/s12583-019-1025-3
Citation: Lei Shu, Kun Shen, Renchao Yang, Yingxin Song, Yuqin Sun, Wei Shan, Yuxin Xiong. SEM-CL Study of Quartz Containing Fluid Inclusions in Wangjiazhuang Porphyry Copper (-Molybdenum) Deposit, Western Shandong, China. Journal of Earth Science, 2020, 31(2): 330-341. doi: 10.1007/s12583-019-1025-3
shu

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

doi: 10.1007/s12583-019-1025-3
  • 1.

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

  • 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

  • 3.

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

Funds:

the Special Fund for "Taishan Scholars" Project in Shandong Province 

the National Natural Science Foundation of China 41372086

the Key R & D Program of China 2016YFC0600606

the National Natural Science Foundation of China 41503038

the National Natural Science Foundation of China 41140025

the Key R & D Program of Shandong Province 2017CXGC1603

the National Natural Science Foundation of China 41672084

the Key R & D Program of Shandong Province 2017CXGC1602

the Key R & D Program of Shandong Province 2017CXGC1601

More Information
  • Corresponding author: Renchao Yang, yang100808@126.com
  • Received Date: 28 Dec 2018
  • Accepted Date: 20 May 2019
  • Publish Date: 01 Feb 2020
    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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