Magnetic anomalies over the Andaman Islands and their geological significance

Article


Rao, Subba, Radhakrishna, M., Haripriya, K., Rao, Someswara and Chandrasekharam, D.. 2016. "Magnetic anomalies over the Andaman Islands and their geological significance." Journal of Earth System Science. 125 (2), pp. 359-368. https://doi.org/10.1007/s12040-016-0660-7
Article Title

Magnetic anomalies over the Andaman Islands and their geological significance

ERA Journal ID1071
Article CategoryArticle
AuthorsRao, Subba (Author), Radhakrishna, M. (Author), Haripriya, K. (Author), Rao, Someswara (Author) and Chandrasekharam, D. (Author)
Journal TitleJournal of Earth System Science
Journal Citation125 (2), pp. 359-368
Number of Pages10
Year2016
Place of PublicationIndia
ISSN0253-4126
0973-774X
Digital Object Identifier (DOI)https://doi.org/10.1007/s12040-016-0660-7
Web Address (URL)https://link.springer.com/article/10.1007%2Fs12040-016-0660-7
Abstract

The Andaman Islands form part of the outer-arc accretionary sedimentary complex belonging to the Andaman–Sumatra active subduction zone. The islands are characterized by thick cover of Neogene sediments along with exposed ophiolite rocks at few places. A regional magnetic survey was carried out for the first time over the Andaman Islands with a view to understand the correlation of anomaly signatures with surface geology of the islands. The residual total field magnetic anomaly maps have revealed distinct magnetic anomalies having intermediate to high amplitude magnetic signatures and correlate with the areas over/close to the exposed ophiolite rocks along the east coast of north, middle and the south Andaman Islands. The 2D modelling of magnetic anomalies along selected E–W profiles across the islands indicate that the ophiolite bodies extend to a depth of about 5–8 km and spatially correlate with the mapped fault/thrust zones.

Keywordsmagnetic survey, ophiolites, magnetic anomalies, Andaman Islands, North-East Indian Ocean
ANZSRC Field of Research 2020370899. Oceanography not elsewhere classified
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File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsIndian Institute of Geomagnetism, India
Indian Institute of Technology, India
Institution of OriginUniversity of Southern Queensland
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