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Radiogenic Heat Production and Rare-Metal Mineralization Affinity of Anorogenic Acid Volcano-Plutonic Rocks from Neoproterozoic Tusham Ring Complex, NW Indian Shield. Constraints on Radioactive, Trace and Rare Earth Element Distributions

2024; Springer International Publishing; Linguagem: Inglês

10.1007/978-3-031-48758-3_34

2522-8722

Naresh Kumar, Naveen Kumar,

Geochemistry and Geologic Mapping

Data on radio-elemental abundances, radiogenic heat production and rare-metal affinity of acid volcano-plutonic rocks of Riwasa, Nigana, Dulheri, Dharan, Khanak, Dadam, Devsar and Tusham areas of Neoproterozoic Tusham Ring Complex (TRC) in the NW Indian Shield, are presented in this paper. Geochemically, the investigated rock types consist of hypersolvus to subsolvus, peraluminous and high-K calc-alkaline to shoshonitic A-type granitoids that are characterized by high SiO2 (59.56–75.73), K2O + Na2O (4.28–9.37), K/Na, Fe/Mg, Ga/Al, Rb/Sr, Th/U, Rb, Zr, Nb, Y, Th, U, REE (except, Eu), halogens (F & Cl) and low CaO (0.03–2.56), MgO (0.07–0.99), Sr, Cr, Ni, P and Eu in abundances. The enrichment of LILE (K, Rb, Ba) and HFSE (Zr, Nb, REE, Th, U), collectively, is attributed to high heat-producing (HHP) and rare-metal bearing granitoids. The acid volcanics of Riwasa and Tusham show wide variations of U (4.70–26.10 ppm), Th (19–145 ppm), Th/U (3.56–15.91), heat production (HP: 3.04–15.30 uWm−3), heat generation unit (HGU: 7.24–36.3 uWm−2) whereas the granitic massifs of Nigana, Dulheri, Dharan, Khanak, Devsar and Dadam show range of U (2.50–35.60 ppm), Th (17–124 ppm), Th/U (3.93–20 ppm), HP (3.03–16.63 uWm−3) and HGU (7.22–39.37 uWm−2), respectively. Moreover, the studied granitoids have much higher values of HP and HGU than the average values of continental crust (3.8 HGU), which indicate a 'hot crust' category and a possible linear relationship among the radioactive heat production, surface heat flow and crustal heat generation in the acid volcano-plutonic rocks of TRC. The elemental geochemistry and mineral chemistry in conjunction with radioactive element distribution (U, Th, K) suggest the possibility of important rare metals and rare earth metals (RMREM) mineralization, i.e., Sn–W, Nb–Sn, Sn–W–Be, porphyry Cu, U–Th and Rb–Ba, respectively, in the study areas.