Abstract
The study of magnetic, gravity and bathymetric data over a segment of Carlsberg Ridge between 3° and 4°N latitude, and 63°30′ and 64°30′E longitude revealed the presence of a prominent N57°W trending rift valley. The depth of the valley varies from 3250 to 4400 m and its width varies from 15 to 19 km. Analysis of the magnetic data leads to the identification of the Brunhes/Matuyama boundary (0.73 Ma) across the ridge axis. The Jaramillo event commonly associated with the fast spreading centres is not reflected in the present study. The late Pliocene-Recent oceanic crust across part of the Carlsberg Ridge evolved with an average spreading rate of 1.25 cm yr −1. The rift valley shallows in the southeast, narrows in the middle and is deeper and wider toward the northwest. The occurrence of large amplitude magnetic and gravity anomalies in association with the bathymetric deep in the northwest within the rift valley is suggested to be a zone of future segmentation of the ridge axis. A new transform fault appears to offset the trend of bathymetric and gravity contours in the northwestern part of the study area.
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