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

B. V. Ramanamurthy ¹

Affiliations
1 Superintending Geologist, Singareni Collieries Co. Ltd, IN

Abstract

The existence of 450 ± 50 m of Barren Measures, underlain by Barakar Formation and overlain by the coal-bearing lower member of Kamthi Formation has been established in this field.

The depositional environment as deduced from the textural analysis, shows that it was initially glacial, followed by glaciofluvial, and flood basin complex of either anastomosed or braided river system, interchanging at times with lacustrine conditions. The till fabric and palaeocurrent analysis indicate an overall northerly current direction, with occasional swings to either north-northwest or north-northeast, hence a northerly palaeosiope with a southerly located provenance is indicated.

Pebble lithology, light and heavy mineral composition of the sediments, together with palaeocurrent data, reveal that the main source of detritus was the Peninsular gneiss, with the associated Proterozoic sediments.

Full Text

     

B. V. Ramanamurthy ¹, E. V. R. Parthasarathy ²

Affiliations
1 Singareni Collieries Co. Ltd., Kothagudem Collieries-507101, IN
2 Geological Survey of India, IN

Abstract

Lineaments numbering about 110, show two major preferred directions, i.e., northwest-southeast and northeast-southwest. Majority of the lineaments are believed to be of Archaean ancestry. The Precambrian Pakhal, Sullavai, and the upper Palaeozoic to Mesozoic Gondwana sediments were deposited largely in a fault-controlled, successively developed troughs, broadly trending in a northwest-southeast direction. A five-stage tectonic evolution of the Godavari basin is envisaged. Absence of volcanism, and the narrow rift zones, place the Godavari Graben in the 'Crevice' type of platform rift zone of Milonovsky (1972).

Full Text