Petrographical Investigation of Volcano-Plutonic Rocks Around Deora, Siwana Ring Complex, Western Rajasthan

Petrography is the study of rocks in which mineral content and textural relationship within rock are described. Petrographical analysis suggest the classification group of rocks. Petrographic descriptions includes with the field records at the outcrop and macroscopic study of hand-sized specimens in thin sections. The detailed analysis of minerals by optical mineralogy in thin section and the micro-texture and structure are needs to understanding the origin of the rock. The Siwana Ring Complex (SRC) is a collapsed caldera structure, an anorogenic, rift-related, bimodal volcano-plutonic rock association belonging to the Malani Igneous Suite which spread over 800 sq. km. area in south western Rajasthan. It comprises of felsic and basic volcanic lava flows, rhyolite, peralkaline granite, pyroclastics, tuff and later microgranite, aplite and felsite dykes. (Imran, et al., 2023). Volcano-plutonic associations, anorogenic setting of Siwana ring complex have a potential for rare earths and rare metals (Kochhar, 1992; Jain et al., 1996; Vallinayagam and Kochhar, 1998; Bhushan and Chittora, 1999; Kochhar, 2000; Vallinayagam, 2001; Vallinayagam, 2004; Singh and Vallinayagam, 2009, Singh and Vallinayagam, 2013). Volcano-plutonic rocks around Deora area may have a plenty scope for potential rare earth elements and rare metals. Mainly the rock types exposed in the area around Deora, Meli, Bhati Khera, Mangla, Balu, Rakhi and Dantala of Siwana Ring Complex are granite, microgranite, rhyolite, trachyte, trachy–dacite, basalt and dolerite etc. Hence it is proposed to conduct a geological investigation on petrological studied of rocks to evaluate its bearing mineralization potential in the area around Deora, Siwana Ring Complex, western Rajasthan.