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Authors
Affiliations
1 National Mineral Development Corporation Ltd., Khanij Bhavan, Masab Tank, Hyderabad – 500028, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No Spl Iss 3 (2007), Pagination: 625-640
Abstract
Two Kimberlite pipes in Bommaganapalli area, Kalyandurg, Anantapur District are reported based on stream sediment sampling yielding HIM's viz., garnets ('G 9' lherzolitic, 'G 10' harzburgitic and eclogitic with Na2O (>0.07 wt%), Cr-diopsides (from garnet peridotites), spinels and ilmenites. Ground magnetic survey indicated magnetic anomaly of about 280 nT in KL-5 and an anomaly of100 n T over KL-6.The anomaly over KL-5 was dipolar. The 'Maturation Index' (MI) of 9.8 and MgO content 8.08 of the calcrete over this area indicate their kimberlitic nature. Analysis indicates that the chrome spinels fall in the diamond stability field. Garnets suggest they are of the nature of "G 10" harzburgitic garnets.
Keywords
Kimberlite, Stream Sediment Sampling, Magnetic Survey, Diamond Indicator Minerals.
