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Authors
Affiliations
1 Geological Survey of India, Calcutta, IN
2 Mineralogisk-Geologisk Museum, Sarsgate, Oslo, NO
3 Mineralogical Museum Oslo, NO
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 22, No 7 (1981), Pagination: 305-315
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.