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- NAYAK B.R.
- Regional Research Laboratory (CSIR)
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- MOHAPATRA B.K.
- Regional Research Laboratory (CSIR)
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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 XCO<sub>2</sub> variation in closed spaced area and strong internal buffering of fO<sub>2</sub> during metamorphism.
収録刊行物
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- 岩鉱
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岩鉱 93 (10), 380-388, 1998
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681210994048
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- NII論文ID
- 10002090527
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- NII書誌ID
- AN10047992
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- COI
- 1:CAS:528:DyaK1MXos1Ojtw%3D%3D
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- ISSN
- 18813275
- 09149783
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- NDL書誌ID
- 4642337
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可