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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/126/06/0084

    • Keywords

       

      South Rewa Basin; remote sensing; gravity; magnetic; lineament; structures; dykes.

    • Abstract

       

      Intracratonic South Rewa Gondwana Basin occupies the northern part of NW–SE trending Son–Mahanadi rift basin of India. The new gravity data acquired over the northern part of the basin depicts WNW–ESE and ENE–WSW anomaly trends in the southern and northern part of the study area respectively. 3D inversion of residual gravity anomalies has brought out undulations in the basement delineating two major depressions (i) near Tihki in the north and (ii) near Shahdol in the south, which divided into two sub-basins by an ENE–WSW trending basement ridge near Sidi. Maximum depth to the basement is about 5.5 km within the northern depression. The new magnetic data acquired over the basin has brought out ENE–WSW to E–W trending short wavelength magnetic anomalies which are attributed to volcanic dykes and intrusive having remanent magnetization corresponding to upper normal and reverse polarity (29N and 29R) of the Deccan basalt magnetostratigrahy. Analysis of remote sensing and geological data also reveals the predominance of ENE–WSW structural faults. Integration of remote sensing, geological and potential field data suggest reactivation of ENE–WSW trending basement faults during Deccan volcanism through emplacement of mafic dykes and sills. Therefore, it is suggested that South Rewa Gondwana basin has witnessed post rift tectonic event due to Deccan volcanism.

    • Author Affiliations

       

      Swarnapriya Chowdari1 Bijendra Singh1 2 B Nageswara Rao1 Niraj Kumar1 A P Singh1 D V Chandrasekhar1 3

      1. Gravity and Magnetic Studies Group, CSIR-National Geophysical Research Institute, Hyderabad 500 007, India.
      2. Indian Institute of Geomagnetism, Navi Mumbai, Maharashtra 410 218, India.
      3. Deceased

    • Dates

       
      Published
      31 August 2017
      Manuscript received
      23 August 2016
      Manuscript revised
      3 March 2017
      Accepted
      5 March 2017

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