Chandni Chaurasia

Wadia Institute Of Himalayan Geology, Petrology and Geochemistry, Ph.D

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Tomoaki Morishita

Kanazawa University

Krishnakanta Kshetrimayum

Assam University

Gordon Southam

The University of Queensland, Australia

iftikhar Ahmed

Sultan Qaboos University

Charlie Thomsen

American River College

Fenglin niu

Rice University

Paolo Ballirano

Università degli Studi "La Sapienza" di Roma

Adrian Lenardic

Rice University

Elena Belluso

Università degli Studi di Torino

Daniel Asiedu

University of Ghana

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Papers by Chandni Chaurasia

<scp>U–Th–Pb<sub>Total</sub></scp> monazite geochronology of the felsic volcanic rocks from the Hutti greenstone belt: Evidence of magmatic and hydrothermal events

Geological Journal, Aug 20, 2023

Tectonic evolution of the Higher Himalayan Crystalline Sequence, Dhauliganga valley, Garhwal Himalaya: Insights from P–T conditions of metamorphism and partial melting

Journal of Asian earth sciences, Mar 1, 2024

Occurrence and Stability of Allanite and Monazite in the Greater Himalayan Sequence, Dhauliganga Valley, Garhwal Himalaya

Journal of the Geological Society of India, 2020

The occurrence and relative stability of metamorphic allanite and monazite in metapelites of the ... more 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 o C and 9.5 kbar. Monazite shows widely varying ThO 2 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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The Fate of Pyroxenes in Mafic Xenoliths from the Kinnaur Kailash Granite, Sutlej Valley, NW Himalaya: Effect of Retrograde Hydration and Insights on the Rare Occurrence of High-Grade Metamorphic Rocks in the Himalayan Orogen

Journal of Petrology

Pseudosection modelling of post-peak mineral assemblages in metamorphosed mafic xenoliths from th... more Pseudosection modelling of post-peak mineral assemblages in metamorphosed mafic xenoliths from the Kinnaur Kailash Granite, Northwest Himalaya, has provided new insights into pre-Himalayan metamorphism and constrained the P–T conditions of hydration. P–T and P–MH2O pseudosections constructed in the NCFMASH system show that retrograde hydration occurred during destabilisation of orthopyroxene and clinopyroxene in mafic granulites after decompression to 0.3 GPa pressure, and as a result, water-containing phases such as cummingtonite and hornblende formed. Results from two of the studied xenoliths indicate that the secondary mineral assemblage is controlled not only by P and T, but also by the amount of water available for hydration. In contrast, another example indicates the development of cummingtonite from hornblende via dehydration reaction after decompression to conditions appropriate for cummingtonite stability. The study shows that the Higher Himalayan Crystalline Sequence (HHCS...