Multibeam bathymetric, gravity and magnetic studies over 79 degrees E fracture zone, central Indian basin
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Date
1993Author
KameshRaju, K.A.
Ramprasad, T.
Kodagali, V.N.
Nair, R.R.
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A regional scale bathymetric map has been constructed for the 79 degrees E fracture zone (FZ) in the Central Indian Basin between 10 degrees 15'S and 14 degrees 45'S lat. and 78 degrees 55'E and 79 degrees 20'E long. using the high-resolution capabilities of the Hydrosweep multibeam swath bathymetric survey system. The bathymetric map clearly reveals the 79 degrees E FZ, depicting a ridge and trough topography with an elevation difference of over 300 m. Prominent E-W bathymetric lineations and several new features such as seamounts are conspicuous on the map. The E-W bathymetric lineations bend at the fracture zone toward south resulting in oblique extensional features. These features are more prominent in the middle and northern portion of the study area and are less significant in the southern portion. The prominence of these features in the north and their subtle presence in the south are probably related to the strong and weak shear coupling at the RTI, respectively, during the various stages of FZ evolution. Gravity and magnetic data were analyzed together with the bathymetric data. The observed free-air gravity across the 79 drgrees E FZ is modeled in terms of the lithospheric thickness, taking into consideration the thermal evolution of the oceanic lithosphere. A lithosphere thickness of about 100 km is inferred from these studies
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