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Volume 1 Issue 2 (October 2022)

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Petrological and Geochemical Characteristics of Al-rich Pelitic Granulites/Paragneiss from Thana, District-Bhilwara Rajasthan: Implication for Its Origin

DOI: https://doi.org/10.36956/eps.v1i2.564

Received: 23 June 2022; Revised: 25 July 2022; Accepted: 29 July 2022; Published Online: 10 August 2022

Copyright © 2022 Harel Thomas, Jyoti Bidolya, Aman Soni, Rishabh Batri. Published by Nan Yang Academy of Sciences Pte. Ltd.

Creative Commons LicenseThis is an open access article under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) License.

Abstract

Al-rich pelitic granulites/paragneiss are frequently observed in the mediumto high-grade metamorphic rocks of Thana. It is dominantly composed of sillimanite-kyanite-garnet-biotite-plagioclase-k-feldspar and a subordinate amount of quartz. Garnet both xenoblastic as well as idioblastic is wrapped round by flaky minerals. These Al-rich pelitic granulites are the result of the metamorphism of pre-existing sedimentary rocks under medium to high grade P-T conditions and consist essentially of sillimanite-kyanite -staurolite-garnet-biotite bearing Al-rich pelitic granulites/paragneiss. The geochemical data reflect that Thana pelitic granulite is of S-type and peraluminous in nature. Geochemically, the protolith for these Al-rich pelitic granulites/paragneiss are shale or greywacke. Paper records the petrography, geochemical characters and a probable origin of these Al-rich pelitic granulites/paragneiss.

Keywords: Petrogeochemistry, Protolith, Al-rich pelitic granulites/paragneiss, Tectonic settings and origin

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Online ISSN: 2810-9732, Published by Nan Yang Academy of Sciences Pte. Ltd.