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Geomagnetic Deep Sounding in Andaman Islands

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The Andaman Islands and Adjoining Offshore: Geology, Tectonics and Palaeoclimate

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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.

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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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Author notes

  1. Santu Ghoshal

    Present address: ONGC, Jorhat, Assam, India

Authors and Affiliations

  1. Indian Institute of Geomagnetism, New Panvel, Navi Mumbai, 410218, India

    P. B. V. Subba Rao, Santu Ghoshal, P. V. Vijaya Kumar & A. K. Singh

  2. Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai, 400076, India

    M. Radhakrishna

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  1. P. B. V. Subba Rao
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Correspondence to P. B. V. Subba Rao .

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Editors and Affiliations

  1. Geosciences Division, Physical Research Laboratory, Ahmedabad, Gujarat, India

    Jyotiranjan S. Ray

  2. Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai, Maharashtra, India

    M. Radhakrishna

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Subba Rao, P.B.V., Radhakrishna, M., Ghoshal, S., Vijaya Kumar, P.V., Singh, A.K. (2020). Geomagnetic Deep Sounding in Andaman Islands. In: Ray, J., Radhakrishna, M. (eds) The Andaman Islands and Adjoining Offshore: Geology, Tectonics and Palaeoclimate. Society of Earth Scientists Series. Springer, Cham. https://doi.org/10.1007/978-3-030-39843-9_9

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