Petrographic Characteristics of Host and Associated Rocks in the Pb-Zn Deposit of Rampura-Agucha Area, Bhilwara Belt (Rajasthan) India

Abstract

The present study is to confine the Rampura-Agucha area, Bhilwara district, Rajasthan, which occurs in Bhilwara Super group at the contact with Banded Gneissic Complex. The Bhilwara belt is a thick pile of metasedimentary rocks in the eastern part of Aravalli-Delhi belt that consists dominant litho-units viz: graphite-sillimanite-garnet schist, garnet-biotite-sillimanite gneisses with garnet-bearing leucosomes as well as amphibolites, pegmatites and some scattered calc-silicates while the Pb-Zn ore deposit mainly occurs within graphite-biotite-sillimanite schist. The mineralogical assemblages of host rocks explain that they are formed under the high grade of metamorphism, primarily upper amphibolite to granulite facies condition. These Pb-Zn bearing ore are intimately associated with schist. The inclusions of quartz are common in garnets, while ore minerals also contain the inclusion of quartz and feldspar. The highly fractured grains of garnet, hornblende and pyroxene due to deformation, and pressure are observed in these host rocks while the contact between the quartz grains is of suture type in the calc-silicate rock.