Surface Heat Flow And Igneous Intrusion In The Cambay Basin, India

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Journal Article: Surface Heat Flow And Igneous Intrusion In The Cambay Basin, India

Abstract
Heat flow values from some additional locations in the Cenozoic Cambay Basin have been determined. Together with the previously published data, they show that the heat flow is moderate (55-67 mW/m') in the southern part of the basin towards Broach and Ankleswar, and that there is a clear trend of high heat flow (75-93 mW/m2; range of average values for six different, widely separated, locations) in a part of the basin located north of the Mahisagan river between Cambay and Mehsana along a stretch of about 140 km. Conductive steady state geotherms, calculated using observed high surface heat flow values and appropriate models show, beneath the Cambay-Mehsana area, a large degree of melting in the lower crust and upper mantle, which is not suggested by the existing geodata. Considering this aspect and taking into account the existence of a normal crust about 37 km thick below the Cambay-Tarapur and Ahmedabad-Mehsana blocks (as obtained from deep seismic soundings), it has been inferred that the heat flow anomaly is due to transient thermal perturbations introduced from tectonic activity in the form of magmatic intrusions. A careful analysis of heat flow, gravity and other related geodata point out and support the possibility of a Miocene/Pliocene basic intrusive body at a depth of around 10 km under the Cambay-Mehsana area. Further, the consistent trend of the thermal and gravity fields indicates thinning of the postulated intrusive body from Cambay towards Mehsana.

Author 
Mohan L. Gupta








Published Journal 
Journal of Volcanology and Geothermal Research, 1981





DOI 
Not Provided
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Citation

Mohan L. Gupta. 1981. Surface Heat Flow And Igneous Intrusion In The Cambay Basin, India. Journal of Volcanology and Geothermal Research. (!) .