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

Gaurav Joshi; K. K. Agarwal; Amar Agarwal; J. R. Vidal-Solano

doi:10.1007/s12040-019-1245-z

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

Gaurav Joshi^*, K. K. Agarwal, Amar Agarwal, J. R. Vidal-Solano

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Intensely deformed and mylonitised rocks of the Almora Crystalline Zone (ACZ) have shown the potential of ²³⁸U and ²³²Th enrichment. ²³²Th, ²³⁸U and ⁴⁰K 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.

Original language	English
Article number	212
Journal	Journal of Earth System Science
Volume	128
Issue number	8
DOIs	https://doi.org/10.1007/s12040-019-1245-z
State	Published - 1 Dec 2019

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Publisher Copyright:
© 2019, Indian Academy of Sciences.

Keywords

Almora Crystalline Zone
Kumaun Lesser Himalaya
North Almora Thrust Zone
Spectrometry
Uranium enrichment

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title = "Uranium enrichment at North Almora Thrust Zone, Kumaun Lesser Himalaya, Uttarakhand, India",

abstract = "Intensely deformed and mylonitised rocks of the Almora Crystalline Zone (ACZ) have shown the potential of 238U and 232Th enrichment. 232Th, 238U and 40K 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.",

keywords = "Almora Crystalline Zone, Kumaun Lesser Himalaya, North Almora Thrust Zone, Spectrometry, Uranium enrichment",

author = "Gaurav Joshi and Agarwal, {K. K.} and Amar Agarwal and Vidal-Solano, {J. R.}",

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doi = "10.1007/s12040-019-1245-z",

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T1 - Uranium enrichment at North Almora Thrust Zone, Kumaun Lesser Himalaya, Uttarakhand, India

AU - Joshi, Gaurav

AU - Agarwal, K. K.

AU - Agarwal, Amar

AU - Vidal-Solano, J. R.

PY - 2019/12/1

Y1 - 2019/12/1

N2 - Intensely deformed and mylonitised rocks of the Almora Crystalline Zone (ACZ) have shown the potential of 238U and 232Th enrichment. 232Th, 238U and 40K 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.

AB - Intensely deformed and mylonitised rocks of the Almora Crystalline Zone (ACZ) have shown the potential of 238U and 232Th enrichment. 232Th, 238U and 40K 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.

KW - Almora Crystalline Zone

KW - Kumaun Lesser Himalaya

KW - North Almora Thrust Zone

KW - Spectrometry

KW - Uranium enrichment

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DO - 10.1007/s12040-019-1245-z

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AN - SCOPUS:85069692236

SN - 2347-4327

VL - 128

JO - Journal of Earth System Science

JF - Journal of Earth System Science

IS - 8

M1 - 212

ER -

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

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Keywords

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