Geophysical investigations over a segment of the Central Indian Ridge, Indian Ocean |
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| Authors: | K A Kamesh Raju T Ramprasad C Subrahmanyam |
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| Institution: | (1) National Institute of Oceanography, DonaPaula, Goa 403 004, India, IN;(2) National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, India, IN |
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| Abstract: | Swath bathymetric, gravity, and magnetic studies were carried out over a 55 km long segment of the Central Indian Ridge.
The ridge is characterized by 12 to 15 km wide rift valley bounded by steep walls and prominent volcanic constructional ridges
on either side of the central rift valley. A transform fault at 7°45′S displaces the ridge axis. A mantle Bouguer anomaly
low of −14 mGals and shallowing of rift valley over the middle of the ridge segment indicate along axis crustal thickness
variations. A poorly developed neovolcanic zone on the inner rift valley floor indicate dominance of tectonic extension. The
off-axis volcanic ridgs suggest enhanced magmatic activity during the recent past.
Received: 24 May 1996 / Rivision received: 13 January 1997 |
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