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    Volume 43 Issue 9
    Sep.  2018
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    Article Navigation >  Earth Science  > 2018  >  43(9): 2987-3000
    Zhang Weifeng, Chen Huayong, Wang Yunfeng, Zhao Liandang, Lu Wanjian, 2018. Mineral Chemistry of Magnetite from the Duotoushan Deposit in the Eastern Tianshan: Constraints on the Evolution of Ore-Forming Fluids. Earth Science, 43(9): 2987-3000. doi: 10.3799/dqkx.2018.232
    Citation: Zhang Weifeng, Chen Huayong, Wang Yunfeng, Zhao Liandang, Lu Wanjian, 2018. Mineral Chemistry of Magnetite from the Duotoushan Deposit in the Eastern Tianshan: Constraints on the Evolution of Ore-Forming Fluids. Earth Science, 43(9): 2987-3000. doi: 10.3799/dqkx.2018.232
    shu

    Mineral Chemistry of Magnetite from the Duotoushan Deposit in the Eastern Tianshan: Constraints on the Evolution of Ore-Forming Fluids

    doi: 10.3799/dqkx.2018.232
    • 1.

      Wuhan Center of China Geological Survey, Wuhan 430205, China

    • 2.

      Research Center of Granitic Petrogenesis and Mineralization, China Geological Survey, Wuhan 430205, China

    • 3.

      Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

    • Received Date: 2018-04-10
    • Publish Date: 2018-09-15
      Abstract
    • The Duotoushan Fe-Cu deposit is a typical submarine volcanic rock-hosted iron oxide deposit and situated in the western margin of the Aqishan-Yamansu belt, eastern Tianshan. Nevertheless, studies on its ore minerals are absent. As a common mineral in many types of hydrothermal deposits, mineral chemistry of magnetite can reveal the ore-forming processes in mineralization systems. In this paper, we present integrated study on paragenesis and mineral chemistry data of magnetite at the Duotoushan deposit, eastern Tianshan. Based on the mineral paragenesis and mineral assemblages, it is found that there are three representative magnetite types in the Duotoushan deposit. The granular M1a type magnetite grains coexist with epidote, amphibole and pyrite, whereas the M1b magnetite is intergrown with quartz, epidote, amphibole and pyrite. The branch shape magnetite grains of M2 type coexist with amphibole only. Due to depletion in Ti (84×10-6-1 117×10-6), Al (417×10-6-5 273×10-6) and high field-strength elements, all the magnetite grains are identified as a hydrothermal origin. Compared with the M2 magnetite, M1a and M1b magnetite are enriched in Si, Ca, Al and Mn, which can be attributed to the influence of micro-scale inclusions. The gradually reduced concentrations of titanium in the magnetite samples from M1a to M2 may be attributed to the decreasing crystallization temperatures. In addition, the variable compositions of vanadium and chromium suggest oxygen fugacity decreased first and then increased during the fluids evolution. Given that M2 magnetite contains higher magnesium contents and geological constrains, we propose that seawater may have contributed to the hydrothermal system during late magnetite mineralization stage.

       

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