Petrography of Metasediments and Associated Intrussive Rocks Exposed around Revdar Region, District Sirohi, Rajasthan

Yogesh Manat | Kamal Kant Sharma ^[2] | Ritesh Purohit ^[2] | Harish Kapasya

Abstract: Northwest Indian shield has evidences of theirororgeniccycles pertainy to the Precambraian period. The Sirohi orogenic cycle is the youngest among the three orogenic cycles which is curtailed to Neoproterozoic besides the two Palaeoproterozoic Aravalli orogeny and the Mesoproterozoic Delhi orogeny. The metasedimentary and metavolcanic sequences of the Sirohi Orogeny are along as a gneissic-granatoid basement termed as veerwara Gneissic Complex, dating a 1000 Ma. TtheSirohioroganic cycle had a span of nearly 150 Ma ranging from 1000 Ma to 850 Ma. The Sirohi orogeny is the most dynamic period of the earth?s history at the beginning of the Neoproterozoic. Globally this period has been turned as an amalgamation of the Rodinia Supercontinent which later fragmented at nearly 750 Ma. The present area of shield is one of the basins of Sirohi orogeny which most probably opened up with the other basins which are located in north. The Revdar area, which is present area of investigation has few exposures of the Neoproterozoic metasediments of the Sirohi Group but not documented so far. The sediments are metamorphosed to low-grade regional metamorphism and area confirmed as marbles, calc silicates, micaceous quartzite and garnet-mica-schist. The basin opening is denoted by occurrence of meta basalts in few pockets which have a granitic basement. The rocks show the single phase deformation like the other metasediments of sirohi orogeny.

Keywords: Metasediments, Neoproterozoic, Precambrian Orogeny, Revdar, Sirohi Group

Edition: Volume 11 Issue 11, November 2022,

Pages: 1240 - 1250