Ore genesis of Fanjiabuzi talc deposit in Liaodong Peninsula: constrained by magnesium isotope evidence
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1.College of Geophysics and Petroleum Resources,Yangtze University;2.MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences;3.Liaoning No.5 Geological Team Co LTD,China Liaoning Yingkou

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    Abstract:

    The Fanjiabuzi talc deposit in the Liaodong Peninsula occurs within magnesite marble strata of Member three of the Dashiqiao Formation in the Paleoproterozoic Liaohe Group, representing a Mg-rich carbonate replacement-type talc deposit. This study conducted element geochemical and Mg isotope geochemical analyses on ore bodies and wall rocks of the Fanjiapuzi talc deposit. Results indicate that: (1) Talc ore bodies inherit the rare earth element (REE) and trace element geochemical characteristics of their marine sedimentary magnesite marble wall rocks; (2) Relative to the marine Mg isotope geochemical characteristics of Mg-rich marble strata in Member three of the Dashiqiao Formation (δ2?Mg: -1.03‰ to -1.12‰), the Mg isotope compositions of talc ores (δ2?Mg: -0.48‰ to +1.06‰) exhibit significant variations. Therefore, during the regional metamorphism of the Lüliang Orogeny affecting the Paleoproterozoic Liaohe Group Dashiqiao Formation, Mg-rich carbonate formations likely experienced multi-stage Si-rich metamorphic hydrothermal fluid replacement processes. These processes caused varying degrees of element partitioning and Mg isotope kinetic fractionation between carbonate and talc during the steatitization mineralization.

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History
  • Received:April 10,2025
  • Revised:April 10,2025
  • Adopted:April 11,2025