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Geochemistry of Archaean volcanic rocks from Iron Ore Supergroup, Singhbhum, eastern India

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Abstract

Mafic-ultramafic rocks of Archaean age constitute a significant component of the Eastern Indian Craton. These occur in two different modes. In the eastern belt these occur as a long, linear enclave within the Singhbhum granite and the primary banding in them is subvertical. In the more extensive western belt along the periphery of the Singhbhum granite, the disposition of the primary banding is subhorizontal.

The major rock type in both the belts is meta-basalt with minor peridotitic komatiite and basaltic komatiite occurring in the eastern belt. Rare ultramafic rocks with cumulate textures are present in both the belts. The larger volume of the basaltic rocks preclude the possibility of their being derived by fractional crystallization of the high-MgO components.

On the basis of trace element and REE characters the rocks may be classified into three groups. One of the groups shows a tholeiitic trend and include samples mostly from the eastern belt while the second consisting mostly of samples from the western belt shows a calc-alkaline trend. The third group includes samples having elemental ratios intermediate between these two groups. Zr/Nb ratios for the tholeiitic and calc-alkaline samples are different suggesting their sources to be different. The tholeiitic samples have been generated from a source having chondritic REE characters, while the calc-alkaline samples have been generated from a source with LREE enriched character. The high-MgO components in both the groups are suggested to represent high degrees of melting compared to the basalts in each group.

It is further suggested that the tholeiitic basalts have been generated relatively early from a chondritic source. Down-buckling of this material has added LREE enriched melts to the source, thereby changing its character into a LREE enriched one. Melting of a source with such changed character has subsequently produced the calc-alkaline melts. Rocks with variable but intermediate characters between these two groups have been generated as a result of contamination between these two groups.

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Authors and Affiliations

  1. Geological Survey of India, 27, Jawaharlal Nehru Road, 700 016, Calcutta

    S. Sengupta & S. K. Acharyya

  2. ITC, Kanaalweg 3, 2628EB, Delft, The Netherlands

    J. B. DeSmeth

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  1. S. Sengupta
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  2. S. K. Acharyya
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  3. J. B. DeSmeth
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Sengupta, S., Acharyya, S.K. & DeSmeth, J.B. Geochemistry of Archaean volcanic rocks from Iron Ore Supergroup, Singhbhum, eastern India. Proc. Indian Acad. Sci. (Earth Planet Sci.) 106, 327–342 (1997). https://doi.org/10.1007/BF02843457

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