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: http://dx.doi.org/10.36956/eps.v1i2.564

Article ID: 564

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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References


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