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Inferred secondary magma pathways between Puga and Chumathang geothermal systems from magnetotelluric data in the Himalayan collisional zone.

Kumar PVV, Patro PK, Azeez KKA, Reddy KC, Babu N, Shivakrishna M.

EARTH PLANETS AND SPACE

https://doi.org/10.1186/s40623-025-02312-8 

The 3D model of MT data in the Puga Chumathang geothermal zone reveals the crustal architecture, suggesting a possible connection between the two geothermal fields. The model highlights the Kaigar Tso fault's role in the geothermal activity of the Puga valley and maps the Chumathang geothermal reservoir. The prominent conductivity feature (1-10 Ω.m) observed at depths of ~4-8 km can be attributed to a heat source from secondary magma, such as leucogranitic melts derived from the ISZ during the significant Indo Eurasian collision. This study provides a basis for multi-scale geothermal exploration plans in India.

Fig: Schematic model showing the possible mechanism for the Puga-Chumathang geothermal system based on geophysical and geochemical data.

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