印度奥里萨邦baradangua碱性火成岩杂岩的石油化学性质

Journal of Southeast Asian earth sciences Pub Date : 1996-10-01 DOI:10.1016/S0743-9547(96)00065-7

Madhumita Das , S. Acharya

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引用次数: 2

摘要

位于印度奥里萨邦Brahmani河南岸的Baradangua碱性杂岩，走向东西向，南倾陡，与该段东高山带岩性单元的区域走向一致。霞石正长岩是一种高溶质岩石，由钾长石、霞石、斜长石和方解石组成，以黑云母为主要基性矿物。霞石正长岩的agpatic指数[(Na2O + K2O)Al2O3 mol prop]在0.43 ~ 0.74之间，显示其云母岩性质。野外、岩石学和地球化学表明霞石正长岩的岩浆成因，其分异模式反映在微量元素的分布上。

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Petrochemical nature of baradangua alkaline igneous complex, Orissa, India

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 [ $(Na_{2} O + K_{2} O) Al_{2} O_{3}$ 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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Journal of Southeast Asian earth sciences

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