Occurrence and Stability of Allanite and Monazite in the Greater Himalayan Sequence, Dhauliganga Valley, Garhwal Himalaya
Authors
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Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun – 248 001
C. Chaurasia -
Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai – 400 076
K. Madhavan
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Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun – 248 001
S. S. Thakur
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Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai – 400 076
S. C. Patel
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Department of Geology, Banaras Hindu University, Varanasi – 221 005
A. K. Samal
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Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun – 248 001
S. Nema
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Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun – 248 001
P. K. Dixit
DOI:
https://doi.org/10.1007/s12594-020-1602-1Keywords:
No Keywords.Abstract
The occurrence and relative stability of metamorphic allanite and monazite in metapelites of the Greater Himalayan Sequence (GHS) in the Dhauliganga valley, Garhwal Himalaya have been studied. The GHS is marked by kyanite grade metamorphism in the lower and middle structural levels and sillimanite grade metamorphism in the upper structural level. The occurrence of allanite is restricted to the lower structural level, while monazite occurs in the middle and upper structural levels. The allanite-out reaction occurred at ∼660 °C and 9.5 kbar. Monazite shows widely varying ThO2 content which can be explained mostly by brabantite substitution. The rocks of the GHS of the Dhauliganga valley display inverted metamorphic sequence and the allanite-out reaction is the result of prograde metamorphism.
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