• J R VIDAL-SOLANO

      Articles written in Journal of Earth System Science

    • Uranium enrichment at North Almora Thrust Zone, Kumaun Lesser Himalaya, Uttarakhand, India

      GAURAV JOSHI K K AGARWAL AMAR AGARWAL J R VIDAL-SOLANO

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      Intensely deformed and mylonitised rocks of the Almora Crystalline Zone (ACZ) have shown the potential of $^{238}U$ and $^{232}Th$ enrichment. $^{232}Th$, $^{238}U$ and $^{40}K$ are investigated by gamma-ray spectrometry in the rock samples collected along the three selected traverses across the North Almora Thrust Zone (NATZ). Obtained average values of U and Th are much higher, 7.3 and 23.9 ppm, respectively, than the average upper crustal abundances (2.8 and 10.7 ppm). The Th/Ra(eU) varies between 2.1 and 23, indicating a higher concentration of Th. The enrichment is due to the remobilisation of the radioisotopes due to the intense mylonitisation and metamorphism from the granitic protolith. The zones of enrichment, although concentrated near NATZ, show a heterogeneous distribution.

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