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Agrawal, P. K.
- Basement Configuration of the Area West of Koyna (India) from the Analysis of Aeromagnetic Data
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 35, No 1 (1990), Pagination: 3-18Abstract
An aeromagnetic map of the area west of Koyna (lr23' N, 73°45' E), bounded between latitude 17°5' Nand 17°35' N and longitude 73°15' E and 73°40' E, is spectrally analysed to derive a basement relief model. The model reflects structural heterogeneity conforming well with the existing estimates of trap thickness from other geophysical methods. Two prominent structural features-one near Chatnali and the other to the west of Durga Dongar-are observed which indicate fault-like structures. Between south of Alore and northeast of Mutagaon, a body with high reverse magnetization with its top lying at a depth of about 1200 m is also indicated. These results seem to indicate a limited triggering role of reservoir-induced seismicity in the region and point to the existence of pre-reservoir instability of the Koyna zone.Keywords
Geophysics, Aeromagnetic Data, Deccan Traps, Koyna, Maharashtra, Spectral Analysis.- Was there an Intracontinental Rift Between India and Sri Lanka?
Abstract Views :216 |
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Affiliations
1 Theoretical Geophysics Group, National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 Theoretical Geophysics Group, National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 3 (1999), Pagination: 237-249Abstract
The nature of tectonic configuration between SE coast of India and NW coast of Sri Lanka has been a subject of considerable debate for over past two decades. In the present work, we analyse long wavelength gravity-magnetic, seismological, satellite imagery and related tectonic, geologic and geomorphic information over India, Madagascar, Sri Lanka and Antarctica to suggest that no intracratonic rift could ever develop between India and Sri Lanka. It appears that in the erstwhile Gondwanaland, Sri Lanka rested in the Lutzo-Holm Bay of Antarctica and had the same relative paleoposition with respect to India as it has today, although a small scale translational and rotational motion as suggested by Yoshida et al. (1992) may not be ruled out. The study throws significant light on the paleoassembly of these continental fragments and suggests the possibility of weak mantle upwelling between India and Sri Lanka which may have resisted the formation of oceanic crust between them.Keywords
Tectonics, Intracontinental Rift, Gondwanaland, Antarctica, Madagascar, Sri Lanka, India.- Nature of Lithospheric Deformation Beneath the Western Continental Margin of India
Abstract Views :163 |
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Authors
Affiliations
1 National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN