Petrogeochemistry of Amphibolites from Shivpura District Bhilwara, Rajasthan, India

Abstract

Amphibolites are frequently observed in the medium-to high-grade metamorphic rocks of Shivpura. These amphibolites are the result of the metamorphism of pre-existing mafic igneous rocks under medium to high grade P-T conditions and consist essentially of hornblende-plagioclase-garnet-clinopyroxene-epidote-iron oxide. Geochemically, these orthoamphibolites are tholeiitic, show association with non-orogenic environment and shift to subalkaline derivatives with progressive differentiation. It is also clear that the parent magma for these rocks was highly evolved in nature. Paper records the petrography, geochemical characters and a probable origin of these amphibolites.

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

“…1725 and ca. 1622 Ma Sarkar et al (1989) [5] ; Joshi et al, (1993) [6] ; Fareeduddin et al, (1994) [7] and Roy et al, (2005) [8] ; Buick et al, (2006) [9] ; Rao et al, (2011) [10] The granulite facies rocks include charnockite/enderbite, mafic granulites, khondalites, leptynites and Al-Mg riched metapelites, reported by Sharma, R.S., (1977,1988 and 1999) [11][12][13] ; [14] and Thomas (1995 and2005) [15,16] ; Thomas and Sujata (2008) [17] , Thomas and Neeraj, (2011a and b) [18,19] ; Thomas and Lalu, (2014) [20] ; Kavita and Thomas, (2018) [21] , Neeraj and Thomas, (2015) [22] and Thomas, H., and Rana, H. (2020) [23] . Al-rich pelitic granulites/paragneiss are the special type of mixed meta-morphic of Bhilwara Complex Gupta (1934) [4] .…”

Mineral Chemistry and Nomenclature of Amphiboles From Thana Bhilwara, Rajasthan, India

“…T he study area exposes rocks of the Banded Gneissic Complex of the Proterozoic age [1,2] , predominantly include basic granulites, pelitic granulites, and amphibolites etc, and constitute the main litho units of the gneissic complex (Figure 1) [1][2][3][4][5][6][7][8][9][10][11][12] .…”