Volume 45 Issue 3
Mar.  2020
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Article Navigation >  Earth Science  > 2020  >  45(3): 930-944
Ren Huan, Zheng Youye, Wu Song, Zhang Xin, Ye Jiwen, Chen Xuedong, 2020. Short-Wavelength Infrared Characteristics and Indications of Exploration of the Demingding Copper-Molybdenum Deposit in Tibet. Earth Science, 45(3): 930-944. doi: 10.3799/dqkx.2019.983
Citation: Ren Huan, Zheng Youye, Wu Song, Zhang Xin, Ye Jiwen, Chen Xuedong, 2020. Short-Wavelength Infrared Characteristics and Indications of Exploration of the Demingding Copper-Molybdenum Deposit in Tibet. Earth Science, 45(3): 930-944. doi: 10.3799/dqkx.2019.983
shu

Short-Wavelength Infrared Characteristics and Indications of Exploration of the Demingding Copper-Molybdenum Deposit in Tibet

doi: 10.3799/dqkx.2019.983
  • 1.

    School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China

  • 2.

    State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China

  • 3.

    School of Earth Resources, China University of Geosciences, Wuhan 430074, China

  • 4.

    Resources Prospection Co. Ltd. of Guangxi Nonferrous Metals Group, Nanning 530022, China

  • Received Date: 2019-10-30
  • Publish Date: 2020-03-15
    Abstract
  • The ore exploration of Demingding mining area of the Gangdese metallogenic belt has been challenging due to inconvenient transportation,high altitude and lack of oxygen,strong physical weathering and cover of the crushed stone. In order to further guide the field mineral exploration,we carried out systematic short-wave infrared spectroscopy analysis based on detailed field observation and cataloging. The scalars of sericite minerals in the short-wave infrared spectrum show a regular change in space. From the concentration center to periphery,the absorption peak wavelength of the Al-OH (Pos2200) gradually becomes longer,the depth of the Al-OH absorption peak (Dep2200) gradually decreases,and the SWIR-IC value gradually becomes smaller. And the three zones are well fitted,which indicates that the temperature of the altered sericite minerals formation is higher and the pressure is higher in the region. Combined with the zircon U-Pb age and the molybdenite Re-Os isotopic age in the ore-forming rocks,we estimate an exploration target area in the mining area where the late copper mineralization overlaps with the early (copper) molybdenum mineralization. Short-wave infrared spectroscopy can quickly and effectively guide mineral exploration and reduce exploration costs. Therefore,it can be used as one of the important methods for prospecting and evaluation of western special landscape areas.

     

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