IDENTIFICATION OF POTENTIAL ZONES FOR KIMBERLITE EXPLORATION – AN EARTH OBSERVATION APPROACH
- 1Geosciences Group, National Remote Sensing Centre, Indian Space Research Organisation, India
- 2NMDC Ltd., Khanij Bhavan, Masab Tank, Hyderabad - 500028, India
- 3Department of Geophysics, Indian Institute of Technology (ISM) Dhanbad, India
Keywords: Alteration, ASTER, EIGEN6C4, Geomorphic anomaly, Kimberlite, Logical Operator, Lithology, Lineament
Abstract. In the present study, we have prepared the thematic evidence layers for identifying the potential zones of kimberlite emplacement in parts of Chhatarpur district, Madhya Pradesh. These thematic layers or evidence layers are geological structure, alteration zones, lineament density, surface alteration and geomorphic anomaly and these layers are prepared from the remote sensing data. As orientation of the geological structures (i.e fault system) and their density have the major role in the emplacement of kimberlite; both of these evidence layers are integrated using “AND” Boolean Logical Operator. On the other hand, two evidential layers regarded as the proxy to indicate the “surface expressions on kimberlite (i.e. alteration zones and geomorphic anomaly) are combined using “OR” operator as either of these two surface expression is indicative of kimberlite. Consequently, conjugate evidence layers on the surface expressions of kimberlite are integrated with the causative evidence layers of kimberlite emplacement using “AND” operator to identify the potential zones of diamond occurrences. Potential zones of kimberlite are overlaid on the residual gravity anomaly map derived from space-based gravity model of European Improved Gravity of Earth by New Technique (EIGEN6C4) to relate potential zones of kimberlite with the similar structural alignment (delineated in the residual gravity map) of known occurrence of kimberlite. We also have carried out indicator mineral survey around these potential zones and some of the kimberlite specific indicator minerals are identified in the stream sediments within these potential zones.