Genesis and significance of different types of mineral inclusions in podiform chromitite
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P578.4+6;P588.12+5

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    Abstract:

    Podiform chromite is a very important strategic resource, and scholars have not an unified understanding of its origin. Previous studies mainly constrained the genesis of chromitite from petrology, geochemistry and geochronology. It is still deficient in systematic summary and research about the inclusion types and their implications on geological processes. According to the detailed study of different chromitite bodies, the mineral inclusions can be divided into five catagories: ① Anhydrous silicate mineral inclusions, including olivine, orthopyroxene, clinopyroxene, etc.; ② Hydrous minerals, including hornblende, chlorite, serpentine, and apatite; ③ Platinum group minerals (PGM) and sulfides, including Os-Ir alloy, Pt-Fe alloy, natural Os and natural Ir, as well as pyrite, chalcopyrite, pyrrhotite, etc.; ④ Crust source minerals, including zircon, rutile, quartz, calcium chromium garnet, etc.; ⑤ Exotic minerals, including ultra-high pressure minerals such as diamond, moissanite, coesite, and natural nickel, natural chromium, natural iron and natural titanium, etc. Through comparative studies, it is determined that they were formed in different stages, and it is preliminarily proposed that there are four stages of the formation of podiform chromitite, which are the mantle plume/mantle convection in the deep mantle, partial melting/magma crystallization differentiation of the mantle peridotite in the oceanic lithosphere, melt-rock reaction in the super subduction zone, and hydrothermal alteration/fluid modification in the later stage. It is believed that the mineral inclusions in chromitite have recorded the environmental conditions of various periods of chromite formation, and can reveal the formation process of chromitite more accurately.

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熊发挥,徐向珍,杨胜标,闫金禹,张博杨,曹楚奇,孙怡,杨经绥,2022,豆荚状铬铁矿中不同类型矿物包裹体成因及指示意义[J].岩石矿物学杂志,41(2):413~436. XIONG Fa-hui, XU Xiang-zhen, YANG Sheng-biao, YAN Jin-yu, ZHANG Bo-yang, CAO Chu-qi, SUN Yi, YANG Jing-sui,2022,Genesis and significance of different types of mineral inclusions in podiform chromitite[J]. Acta Petrologica et Mineralogica,41(2):413~436.

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History
  • Received:December 21,2021
  • Revised:January 24,2022
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  • Online: March 21,2022
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