{"title":"Petrochemical nature of baradangua alkaline igneous complex, Orissa, India","authors":"Madhumita Das , S. Acharya","doi":"10.1016/S0743-9547(96)00065-7","DOIUrl":null,"url":null,"abstract":"<div><p>The Baradangua alkaline complex on the southern bank of the Brahmani river, Orissa, strikes E-W with steep southerly dips, in conformity with the regional trend of the litho units of the Eastern Ghat Mobile Belt of this sector. The nepheline syenite, a hypersolvus rock, comprises potash feldspar, nepheline, plagioclase and calcite, with biotite as the dominant mafic mineral. The agpaitic index [<span><math><mtext>(</mtext><mtext>Na</mtext><msub><mi></mi><mn>2</mn></msub><mtext>O</mtext><mtext> + </mtext><mtext>K</mtext><msub><mi></mi><mn>2</mn></msub><mtext>O</mtext><mtext>)</mtext><mtext>Al</mtext><msub><mi></mi><mn>2</mn></msub><mtext>O</mtext><msub><mi></mi><mn>3</mn></msub></math></span> mol prop] ranges from 0.43 to 0.74 in the nepheline syenites, indicating their miaskitic nature. Field, petrography and geochemistry suggest a magmatic origin for nepheline syenites, the differentiation pattern being reflected by the distribution of the trace elements.</p></div>","PeriodicalId":85022,"journal":{"name":"Journal of Southeast Asian earth sciences","volume":"14 3","pages":"Pages 293-297"},"PeriodicalIF":0.0000,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0743-9547(96)00065-7","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Southeast Asian earth sciences","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0743954796000657","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
The Baradangua alkaline complex on the southern bank of the Brahmani river, Orissa, strikes E-W with steep southerly dips, in conformity with the regional trend of the litho units of the Eastern Ghat Mobile Belt of this sector. The nepheline syenite, a hypersolvus rock, comprises potash feldspar, nepheline, plagioclase and calcite, with biotite as the dominant mafic mineral. The agpaitic index [ mol prop] ranges from 0.43 to 0.74 in the nepheline syenites, indicating their miaskitic nature. Field, petrography and geochemistry suggest a magmatic origin for nepheline syenites, the differentiation pattern being reflected by the distribution of the trace elements.
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