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Distribution and mobilization of Sn in silicate minerals from the Mesozoic Shizhuyuan W-dominated polymetallic deposit, South China

Yuan, Jiaxin ; Hou, Qingye ; Yang, Zhongfang ; Jiang, Hua ; Hu, Zhaochu ; Yu, Tao

Ore geology reviews, 2018-10, Vol.101, p.595-608 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Distribution and mobilization of Sn in silicate minerals from the Mesozoic Shizhuyuan W-dominated polymetallic deposit, South China
  • Autor: Yuan, Jiaxin ; Hou, Qingye ; Yang, Zhongfang ; Jiang, Hua ; Hu, Zhaochu ; Yu, Tao
  • Assuntos: Granite ; LA-ICP-MS ; Shizhuyuan W-dominated polymetallic deposit ; Silicate minerals ; Skarn
  • É parte de: Ore geology reviews, 2018-10, Vol.101, p.595-608
  • Descrição: [Display omitted] •Sn is mainly hosted in biotite, muscovitized biotite, garnet and epidote in granite and skarn.•Sn occurs as an isomorphous substitution and is predominantly associated with Fe3+.•For Fe3+-poor minerals, Sn can substitute for Al in the form of simple cation. Although mobilization and concentration of elements in super large deposits have become hot topics in recent years, studies of the mobilization of metals between minerals using in-situ analyses are rare. The Shizhuyuan W-dominated polymetallic deposit in South China is one of the largest, non-ferrous metal deposits in the world, and contains large metal reserves of Sn, W, Bi, and rare earth elements. Using laser ablation inductively couple plasma mass spectrometry (LA-ICP-MS), we analyzed trace elements in major silicate minerals and magnetite from granites and skarns of the Shizhuyuan deposit. Tin concentrations of muscovitized biotite range from 196 to 558 ppm, muscovite from 57.7 to 332 ppm, chloritized biotite from 1.62 to 527 ppm, K-feldspar from 4.16 to 6.97 ppm, kaolinized K-feldspar from 1.15 to 9.38 ppm, plagioclase from 1.87 to 5.09 ppm, sericitic plagioclase from 2.53 to 28.7 ppm, kaolinized plagioclase from 0.99 to 17.7 ppm, epidote from 1199 to 3382 ppm, garnet from 797 to 2860 ppm, chloritized garnet from 72.5 to 2548 ppm, chlorite from 19.6 to 159 ppm, and magnetite from 23.7 to 872 ppm. Thus, Sn is mainly hosted in biotite, muscovitized biotite, garnet and epidote. Sn occurs as an isomorphous substitution and is predominantly associated with Fe3+. For Fe3+-poor minerals, Sn can isomorphously substitute Al in the form of simple cation due to similar radius at the octahedral site, such as in K-feldspar and kaolinized K-feldspar. However, Sn cannot substitute Al in the Si-O tetrahedrons. Therefore, Sn and Al correlate different in different silicate minerals. Alteration of biotite to muscovite and chlorite can release a large amount of Sn to the magmatic hydrothermal fluids, which may be already enriched in Sn. During the formation of skarn deposits, Sn-F complexes can be converted to cassiterite (SnO2) to free up F by hydrolysis. A significant amount of Sn enters the lattices of garnet and epidote. Therefore, release of Sn during alteration of garnet to chlorite in a retrograde stage of alteration may have contributed to the mineralization.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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