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

T. K. Charlu ¹, V. K. K. Kalluraya ¹

Affiliations
1 Geological Survey of India, WCO-1, Bhandarkar's Complex, Mannagudda, Mangalore - 575003, IN

Abstract

Ferromanganese encrustation is reported from the central Lakshadweep area along the northern flank of Chetlat Island. It has comparatively high contents of Co, Ni, Ag and Pt and a MnlFe ratio of <1. This hydrogenous encrustation is similar in composition to those from the equatorial Mid-Atlantic Ridge.

Keywords

Oceanography, Ferromanganese Encrustation, Lakshadweep, Seamounts, Arabian Sea.

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I. V. Reddy ¹, M. S. Reddy ¹, G. Satyanarayana ¹, V. K. K. kalluraya ¹

Affiliations
1 Geological Survey of India, Hyderabad, IN

Abstract

New finds of oligomictic conglomerate at the base of Culcheru Quartzite near Venganamala and at the base of Nagari Quartzite at Gadikota are reported. It is proposed that the Nagari Quartzite and Pullampet Formation arc unconformably overlain by Bairenkonda Quartzite and Cumbum Formation, thereby necessitating a stratigraphic revision of thc Nallamalai Group.

Keywords

Conglonierate Horizon, Stratigraphy, Cuddapah Basin, Andhra Pradesh.

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