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Melanite garnet-bearing nepheline syenite minor intrusion in Mawpyut ultramafic–mafic complex, Jaintia Hills, Meghalaya

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Mawpyut igneous suite in Jaintia Hills of Meghalaya plateau comprises differentiated suite of ultramafic–mafic rocks. The complex differs from other ultramafic–alkaline–carbonatite igneous emplacements of Shillong plateau and Mikir Hills like Jesra, Sung, Samchampi complexes, by the absence of alkaline–carbonatite rocks as major litho-units. Melanite garnet-bearing nepheline syenite, occurs as late phase minor intrusion in Mawpyut igneous complex, posseses alkaline character and shows inubiquitous relation with the host ultramafic–mafic rocks. On the other hand, this alkaline intrusive bodies of the Mawpyut igneous complex shows chemico-mineralogical resemblance with garnet-bearing nepheline syenite, ijolite litho-members of Jesra, Sung, Samchampi complexes of the region. It is interpreted that melanite garnet-bearing nepheline syenite intrusion in Mawpyut is contemporaneous with Jesra, Sung, Samchampi ultramafic–alkaline–carbonatite complexes and the host rocks of Mawpyut complex is an earlier magmatic activity possibly from a comparatively least enriched source.

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Authors and Affiliations

  1. Central Petrological Laboratories, Geological Survey of India, Kolkata, 700 016, India

    MONOJ MAITRA & J S DAVID

  2. Chemical Division, Eastern Region, Geological Survey of India, Kolkata, India

    S BHADURI

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  1. MONOJ MAITRA
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  2. J S DAVID
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MAITRA, M., DAVID, J.S. & BHADURI, S. Melanite garnet-bearing nepheline syenite minor intrusion in Mawpyut ultramafic–mafic complex, Jaintia Hills, Meghalaya. J Earth Syst Sci 120, 1033–1041 (2011). https://doi.org/10.1007/s12040-011-0129-7

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  • DOI: https://doi.org/10.1007/s12040-011-0129-7

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