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Thermal structure of Bangladesh using aeromagnetic data.

Shubham Yadav, Bansal AR, Chauhan MS,Prakash O.

JOURNAL OF APPLIED GEOPHYSICS

https://doi.org/10.1016/j.jappgeo.2025.106018 

This study investigates the regional thermal structure of Bangladesh by estimating the Curie depth using aeromagnetic anomalies. Conventional thermal measurements, temperature and such heat as flow measurements, are limited by shallow borehole depths and sparse spatial coverage. Therefore, Curie depth analysis provides a more effective method for regional assessment. Our results show an NNW-SSE increasing trend in Curie depth, ranging from 15 to 41 km. The corresponding geothermal gradient (13-35 °C/km) and heat flow anomalies (34-96 mW/m2) characterized the thermal regime of the region. Overall, the complex geological processes, including continental-oceanic crustal transitions, crust-mantle interactions, compositional differences, surface heat distribution, and the structural characteristics of sedimentary layers, strongly govern the thermal structure of Bangladesh.

Fig. (a) Geothermal gradient map derived from the Curie isotherm surface, assuming a Curie temperature of 580 °C. (b) The heat flow map was derived from the Curie isotherm surface, using thermal conductivity 2.6 Wm-1 K-1 for the continental crust.

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