Co-linearity of Important Lead-zinc Deposits of Rajasthan and Its Airborne Geophysical Signatures

摘要

Rajasthan having high basemetal potential constitutes a part of the western Indian Shield comprising several Archaean and Proterozoic belts. At present, Rajasthan contains more than 90 percent of the known economically viable Zn-Pb resources of India. In the shield area of south-central Rajasthan, there are three known major basemetal deposits viz., the largest and intensively exploited Zn-Pb Zawar deposit (24 deg 22 min N:73 deg 42 min E), the polymetallic ore deposit at Rajpura-Dariba (24 deg 58 min N:74 deg 08 min E) and Zn-Pb deposit at Rampura-Agucha (25 deg 49 min N: 74 deg 44 min E). These three deposits account for the maximum production of lead and zinc metals, with silver as a bi-product. The above three deposits are distributed in diverse geological milieu i.e. Agucha deposit occurs in Mangalwar Complex (>2500 Ga), Rajpura-Dariba deposit in Bhilwara Supergroup (2200 to 2600 Ga) and Zawar in Aravalli Supergroup (1800-2200 Ga). In spite of different geological and geochemical set-up, they are having similar metallogeny. In addition to their different geological ages, they are all considered to be stratabound. The co-linearity with some similarity and dis-similarity have attracted the attention of authors as because the studies may lead to prognostication of more target areas, hitherto buried in between the known deposits.The present paper deals with the geological parameters of and geophysical signatures over the deposits and their surrounding areas.