Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

S. V. P. Iyengar ¹, M. S. Rao ¹

Affiliations
1 Bangalore, IN

Abstract

No Abstract.

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S. V. P. Iyengar

Abstract

No Abstract.

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S. V. P. Iyengar ¹, K. K. Basu ¹

Affiliations
1 Geological Survey of India, 27, Jawaharlal Nehru Road, Calcutta 700016, IN

Abstract

The occurrence of an iron-rich end member of the ferro-hornblende division of calcic amphiboles is recorded for the first time. The mineral is found in the granite of Simlipal Complex and is associated with ferrohedenbergite around which it occurs as reaction rims and also as independent grains. The Mg/Fe²⁺Mg ratio of the two analysed samples are 0.017 and 0.027 compared to the earlier recorded values for the mineral which range from 0.20 to 0.49.

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S. V. P. Iyengar ¹, P. Kresten ², D. K. Paul ¹, A. O. Brunfelt ³

Affiliations
1 Geological Survey of India, Calcutta, IN
2 Mineralogisk-Geologisk Museum, Sarsgate, Oslo, NO
3 Mineralogical Museum Oslo, NO

Abstract

In the Mayurbhanj area, Orissa, Badampahar group of rocks formed the cratonic block for younger Dhanjori Group. From the composition of the chilled facies of the gabbro-anorthosite, the parent magma is believed to be low in potash and alumina. The chondrite normalised REE pattern of the ultrabasic rock of Badampahar Group is unfractionated. In contrast, the gabbro-anorthosites have fractionated REE pattern with Eu anomaly. The degree of fractionation increases in the granite-granophyres. Th/U ratios systematically increase with the total REE content. It is suggested that the source region of the magmatic rocks is anomalous in respect of the large ion lithophile elements.

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S. V. P. Iyengar ¹

Affiliations
1 Bangalore, IN

Abstract

No Abstract.

Full Text

   

S. V. P. Iyengar ¹

Affiliations
1 Bangalore, IN

Abstract

No Abstract.

Full Text