Earth and Planetary Science

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

Harel Thomas

Department of Applied Geology, Dr. Harisingh Gour Vishwavidyalaya (A Central University), Sagar (M.P.), 470003, India

Jyoti Bidolya

Department of Applied Geology, Dr. Harisingh Gour Vishwavidyalaya (A Central University), Sagar (M.P.), 470003, India

Aman Soni

Department of Applied Geology, Dr. Harisingh Gour Vishwavidyalaya (A Central University), Sagar (M.P.), 470003, India

Rishabh Batri

Department of Applied Geology, Dr. Harisingh Gour Vishwavidyalaya (A Central University), Sagar (M.P.), 470003, India

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

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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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