Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Abhijeet Mukherjee ¹, Ch. Sravan Kumar ¹, K. Krishna Reddy ¹, S. N. Siddiquie ¹, Lokesh Chaturvedi ¹

Affiliations
1 National Mineral Development Corporation Ltd., Khanij Bhavan, Masab Tank, Hyderabad – 500028, IN

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.

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Ch. Sravan Kumar ¹, Abhijeet Mukherjee ¹, Rajesh K. Vishwakarma ¹

Affiliations
1 National Mineral Development Corporation Ltd., Investigation Division, Khanij Bhavan, Masab Tank, Hyderabad- 500028, IN

Abstract

No Abstract.

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