• T. Balaswamy
• N. Ningam,
• T. Devendhar
• J. Ratnakar

Abstract: The granitic rocks of the Dharwar craton, spread in Yadagirigutta, Yadadri- Bhuvanagiri Districts of Telangana, have attracted inadequate attention of the researchers made up of a variety of granitic rocks remains unclassified and a meaningful geochemical and petrogenetic study is yet to be taken up even after more than a hundred years of geological investigations. The study area is covering the toposheet no. of 56 K/14 part of the Yadagirigutta (17o53’55”N-78o10’22”E), area of the Yadadri Bhuvanagiri District, wherein the lithological variants range from granodiorite through granite, syenogranite, alkali feldspar granite-quartz syenites. This paper attempts at highlighting the geochemistry and petrogenesis of around Yadagirigutta, N of Yadadri. The granites are medium to coarse grained, inequigranular and porphyritic in texture. They are composed of K-feldspar (44-58% by Vol %) represented by orthoclase and microcline perthite, plagioclase (9-20%) and quartz (21- 30%). Mafic minerals include amphibole (1-5%) and biotite (1-8 %) and accessories are magnetite, sphene, and apatite. Presence of discrete plagioclase grains in substantial proportions indicates subsolvus conditions of crystallisation of parental magma. The rocks have high SiO2 (68.02 – 70.00% by wt.), high K2O (4.55-5.72%) and low Na2O (3.50- 4.22%), with a calc-alkaline signature and low iron enrichment trend attesting to a typical of granites. The chondrite normalised REE ratios of the syenogranites display LREE-enriched and HREE-depleted patterns and have a high LREE/HREE ratio that hints at the fractional crystallisation process as a major process. Further, the negative Eu anomaly indicates fractionation of feldspar. The rocks are originated from a LILE-enriched lithospheric mantle.

Key words: Petrology, Granite, K-feldspar, Geochemistry, REE, Yadagirigutta, Yadadri District, Telangana.

"Petrological and geochemical studies on the Yadagirigutta Granites, Yadadri-Bhuvanagiri District, Telangana, Southern India", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 4, page no.c226-c235, April-2022, Available :http://www.jetir.org/papers/JETIR2204231.pdf

"Petrological and geochemical studies on the Yadagirigutta Granites, Yadadri-Bhuvanagiri District, Telangana, Southern India", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 4, page no. ppc226-c235, April-2022, Available at : http://www.jetir.org/papers/JETIR2204231.pdf