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Geochemical and mineralogical studies of chlorine-rich amphibole and biotite from the 2.5 Ga mid-crustal basement beneath the 1993 Killari earthquake region, Maharashtra: Evidence for mantle metasomatism beneath the Deccan Trap

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Journal of the Geological Society of India

Abstract

Fluid driven metasomatism and mass transfer from the earth’s mantle have played an important role in the evolution of the lower continental crust in many geodynamically active areas. The epicentral region of the disastrous 1993 Killari earthquake (M 6.2), concealed below a thick suite of Deccan volcanics in central India, appear to be one such region. In connection with the study of seismotectonics of the earthquake prone Deccan volcanic region, we have carried out systematic and detailed geochemical and mineralogical investigation on core samples from the basement, obtained from the 617m deep KLR-1 borehole, drilled in the epicentral region of Killari. Our investigations indicate that the basement, concealed below 338m thick Deccan volcanics, is made up of CO2, Cl, FeO and CaO-rich, high density (2.82 g/cm3) — high velocity (avg. Vp: 6.2 km/s) moderately retrogressed upper amphibolite to granulite facies mid crustal rocks, which were subjected to pervasive Ca-metasomatism due to infiltration of mantle fluids. Graniticgneissic layer, typical of the upper crust, seems to be totally absent from this earthquake region. Chondrite normalized trace and rare earth elemental patterns display negative Eu anomalies together with LILE enrichment. Similarly, spider diagrams for incompatible elements show depletion in Zr, Hf, Y, Ta and Nb relative to the primitive mantle, indicating possible alterations of such relatively immobile elements at relatively high temperatures. Selective enrichment is also observed in transitional elements like Cu and Zn, indicating the possible role of chlorine in metal transport. The present study suggests that regional metasomatism beneath the Deccan Traps, which apparently alters the basic fabric of the rock during recrystallisation and makes it weak, may have a link with the nucleation of large earthquakes.

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  1. CSIR-National Geophysical Research Institute, Hyderabad, 500 007, India

    O. P. Pandey & G. Parthasarathy

  2. Geological Survey of India, Hyderabad, 500 068, India

    Priyanka Tripathi

  3. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, AMD Complex, Begumpet, Hyderabad, 500 016, India

    V. Rajagopalan

  4. CSIR-Indian Institute of Chemical Technology Uppal road, Hyderabad, 500 607, India

    B. Sreedhar

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  1. O. P. Pandey
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Pandey, O.P., Tripathi, P., Parthasarathy, G. et al. Geochemical and mineralogical studies of chlorine-rich amphibole and biotite from the 2.5 Ga mid-crustal basement beneath the 1993 Killari earthquake region, Maharashtra: Evidence for mantle metasomatism beneath the Deccan Trap. J Geol Soc India 83, 599–612 (2014). https://doi.org/10.1007/s12594-014-0089-z

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