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Geomagnetic Deep Sounding in Andaman Islands

  • P. B. V. Subba RaoEmail author
  • M. Radhakrishna
  • Santu Ghoshal
  • P. V. Vijaya Kumar
  • A. K. Singh
Chapter
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Part of the Society of Earth Scientists Series book series (SESS)

Abstract

The Andaman-Nicobar Islands form a major part of the outer arc sedimentary complex that stretches nearly 1100 km along the Andaman-Sunda trench-arc system and separate the back-arc Andaman basin from the Bay of Bengal. Transient geomagnetic field variations recorded along 25 stations covering North-, Middle- and South- Andaman Islands during different phases have been analyzed. Hypothetical event analyses (HEA) denote anomalous Z/H along the eastern margin of Andaman Islands. This is associated with the contact zone between ophiolite bodies and the sedimentary basin containing terrigenous sediments, clay and fluids. An interpreted model along three different profiles brings out anomalous conductivity zones along Jawar thrust and eastern margin fault (EMF). Anomalous zone along Jawar thrust could be related to the formation of a fractured, cataclastic zone along a fault that can enhance the percolation of fluids. Also, these fluids are generated by the metamorphosis of the subducting crust and sedimentary rocks. Emplacement of obducted sediments and fluids through eastern margin fault has been reflected as an anomalous zone. The above said anomalies could be resolved after separating the island effect from the observed induction arrows.

Keywords

Electromagnetic induction Geomagnetic deep sounding Conductivity anomalies Andaman outer arc Obducted sediments Terrigenous sediments 

Notes

Acknowledgements

The authors are thankful to Prof D S Ramesh Director, IIG for his kind encouragement and support. Finance support received from Department of Science and Technology (DST), New Delhi for the project no: ESS/16/262/2006. We deeply acknowledge Editors for inviting us to contribute to this issue. We would like to thank Prof B R Arora for his comments that has improved the earlier version of the manuscript.

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • P. B. V. Subba Rao
    • 1
    Email author
  • M. Radhakrishna
    • 2
  • Santu Ghoshal
    • 1
    • 3
  • P. V. Vijaya Kumar
    • 1
  • A. K. Singh
    • 1
  1. 1.Indian Institute of GeomagnetismNew Panvel, Navi MumbaiIndia
  2. 2.Department of Earth SciencesIndian Institute of TechnologyPowai, MumbaiIndia
  3. 3.ONGCJorhatIndia

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