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Geothermal Energy

Science – Society – Technology

Fig. 3 | Geothermal Energy

Fig. 3

From: Application of in-situ gamma spectrometry for radiogenic heat production estimation in the Western Himalaya, Kohistan, and Karakoram in northern Pakistan

Fig. 3

a Field gamma spectrometer acquiring U–Th–K data from an outcrop with 3π geometry. b Leucogranite (Lcg) dike (with euhedral tourmaline crystals) intruding basement gneiss (Gns) along the Raikot shear zone in the Nanga Parbat Massif (NPM). c Sheared augen gneiss showing shear deformation in NPM along the Raikot fault. d Cordierite in the migmatitc gneiss display HT–LP conditions in core of the Nanga Parbat during exhumation. e Tourmaline bearing pegmatite dike cross cutting the gneissic fabric in NPM. f Alteration zone (with sulfide smell) showing precipitation of secondary minerals in calc–silicate metapelite (Cs–Mp) along Astore road in NPM. g Hydrothermal deposition of sulfur around the hot spring site at Murtazabad (north of MKT) in the Karakoram metamorphic complex. h Pegmatite (Peg; with garnet and tourmaline) intruding granite (Grn) which is intruding diorite (Drt) of the Kohistan–Ladakh batholith at the confluence of the Indus and Gilgit rivers (i) contact between leucogranite (Lcg) and two-mica Pegmatite (Peg) at the southern edge of the Karakoram batholith along Nagar valley

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