Mn-Pyroxenoids from Gangpur Group of rocks, Orissa, India

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Petrography and petrochemistry of Mn-pyroxenoids in the Mn silicate-oxide and Mn silicate-carbonate-oxide rock assemblages of Precambrian Gangpur Group, Orissa, India are described. The two pyroxenoids, rhodonite and pyroxmangite, appear mutually exclussive of each other. Rhodonite occurs associated with spessartine, Mn-aegirine and tirodite while pyroxmangite coexists with spessartine and tephroite. In the coexisting carbonate members, kutnahorite is associated with rhodonite while rhodochrosite is found with pyroxmangite. Jacobsite is the common oxide present in both the pyroxenoids. Braunite and hematite are the other oxides recorded in rhodonite association in contrast to magnetite with pyroxmangite. The pyroxmangites are richer in FeO and poor in CaO as compared to rhodonites. These two pyroxenoids are considered to have been formed due to decarbonation-oxidation reactions from different progenitors under <i>X</i><sub>CO<sub>2</sub></sub> variation in closed spaced area and strong internal buffering of <i>f</i><sub>O<sub>2</sub></sub> during metamorphism.

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  • 岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology  

    岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology 93(10), 380-388, 1998-10-05 

    Japan Association of Mineralogical Sciences

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各種コード

  • NII論文ID(NAID)
    10002090527
  • NII書誌ID(NCID)
    AN10047992
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09149783
  • NDL 記事登録ID
    4642337
  • NDL 雑誌分類
    ZM46(科学技術--地球科学--岩石・鉱物・鉱床)
  • NDL 請求記号
    Z15-71
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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