• Occurrence of diamond in peninsular India and its relationship with deep Earth seismic properties

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      https://www.ias.ac.in/article/fulltext/jess/128/03/0043

    • Keywords

       

      Daimond; kimberlite; craton; surface wave; tomography.

    • Abstract

       

      An improved shear wave velocity (V$_s$) structure of the lithosphere of peninsular India using the surface wave tomography from the ambient noise and earthquake waveforms suggests its bipolar character. While most of the geological domains of India are characterised by a uniform lithospheric mantle of V$_{s}$ $\sim$ 4.5 km/s, the three cratonic regions, eastern Dharwar, Bastar and Singhbhum, hosting most of the diamondiferous kimberlite fields, show significantly high V$_{s}$ of 4.7 km/s and above in their lower lithosphere beyond $\sim$ 90 km depth. The higher velocity could best be explained by the presence of diamond and/or eclogite along with peridotite in mantle. This unique relationship suggests the regional seismic image of lithosphere as a guide for exploration of diamonds.

    • Author Affiliations

       

      Gokul Saha1 Rai S S1 Shalivahan 2

      1. Department of Earth and Climate Science, Indian Institute of Science Education and Research, Pune, India.
      2. Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad, India.
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  • Journal of Earth System Science | News

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