Abstract
The Proterozoic Aravalli-Delhi orogenic complex hosts a large number of economically important stratabound base metal sulphide deposits. In the present work, rock samples taken from Outcrop and Underground Mine of Sindeskar Kalan, Vedanta Group, Rajpura-Dariba-Bethumni Belt which are located at a distance of 76 Kms from Udaipur District (Rajasthan) have been studied. The chief litho units of the group are identified which contain sulfide-bearing calc-silicate and graphite mica schist, dolomite marble, calc-biotite schist and quartzite. Importance to the ore minerals like galena and sphalerite which have been reported in association with the buffer minerals like pyrite and pyrrhotite occurr in the host rocks of the study area. Ore petrography denotes two types of sphalerites, 1) highly deformed and dark brown colour, 2) less deformed and with light yellow colour. Galena shows high reflectance and a network of triangular pits. Pyrite shows high reflectance and anomalous anisotropism because of high brittleness.
Highlights
Zinc-Lead deposits of various sizes and grades occur throughout the belt in calc-silicate bearing dolomite and graphite mica schist horizons [1], the latter in general containing low-grade disseminated sulfides of large volumes
The stratiform ores of Rajpura-Dariba are characterized by the presence of different verities of laminated sphalerite such as lemon yellow, light brown, and dark brown, a feature that is absent in other deposit in the belt
Fibrous Texture Sphalerite forms concentric overgrowth sinward from a vein wall, radiating from multiple growth along the open fractures and sometimes acicular crystals of sphalerite are found radiating from a centre (Figure 13). 5.1.4
Summary
Zinc-Lead deposits of various sizes and grades occur throughout the belt in calc-silicate bearing dolomite and graphite mica schist horizons [1], the latter in general containing low-grade disseminated sulfides of large volumes. The ores from the various deposits in the belt have more or less similar mineral assemblage, differing. How to cite this paper: Alam, J., Siddiquie, F.N. and Shaif, M. (2015) Petrographic Studies of Pb-Zn Ore Deposits of RajpuraDariba-Bethumni Belt in District Udaipur (Rajasthan) India. J. Alam et al mainly in their relative proportions from deposit to deposit. The stratiform ore bodies [2] mainly comprised sphalerite, galena, chalcopyrite, and pyrite-pyrrhotite. The stratiform ores of Rajpura-Dariba are characterized by the presence of different verities of laminated sphalerite such as lemon yellow, light brown, and dark brown, a feature that is absent in other deposit in the belt
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