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

B. E. Vijayam ¹, T. Stephen George ¹

Affiliations
1 Geology Department, Osmania University, Hyderabad, IN

Abstract

Bedded barite occurs in the Vempalle Formation of Cuddapah Supergroup near Brahmanakotukuru, Kurnool District. It is interlayered with chert bands and is associated with chert breccia. A second barite occurrence, near Gargeyapuram is seen in association with chertified stromatolites and chert beds in the Vempalle Formation.

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K. Madhavan Nair ¹, B. E. Vijayam ²

Affiliations
1 Geological Laboratory, ONGC, 31, Sir Thyagaraya Road, Madras 600017, IN
2 Department of Geology, Osmania University, Hyderabad 500007, IN

Abstract

Niniyur Formation, composed essentially of limestones, of Paleocene age, is exposed along a narrow stretch in the Ariyalur outcrop area. The maximum exposed thickness of 15 m constitutes but a part of the Formation, the rest being concealed by the Cuddalore Sandstone. Three shallow boreholes ENE of Sendurai and 2 stratigraphic information wells in Tanjore area indicate that the Formation extends subsurface over a large area.

Exposed sections show sandy and clayey limestone of wackestone texture, deposited in shelf lagoon environments. But eastward in the subsurface, the formation becomes pure limestone (algal lime boundstone-packstone-grainstone) deposited in algal banks. In the Tanjore area the formation is composed of foraminiferal and algal lime packstone-wackestone, probably deposited in quiet to slightly agitated inner to middle shelf environments. In the deeper parts of the basin, under favourable conditions of tectonics and clastics dispersal, transgressive carbonates of similar age and lithology could be expected.

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M. Shyam Prasad ¹, K. Prabhakar ¹, M. Y. Kamal ¹, B. E. Vijayam ²

Affiliations
1 Department of Geology, Osmania University, Hyderabad, IN
2 Water and Mineral Exploration Research and Training Institute, Hyderabad, IN

Abstract

Study shows a predominant direction of sediment movement towards the northeast throughout the area stretching approximately 18 km. More rapid movement is seen in the eastern part of the bay which is closer to the mouth of the Krishna river. Grain velocity is on the increase the accretion of sand material is maximum resulting in greater progradation in this section of the bay.

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B. E. Vijayam ¹, P. H. Reddy ¹

Affiliations
1 Geology Department, Osmania University, Hyderabad, IN

Abstract

The lithologic character of sediments, geometry and sedimentary characters of the formations belonging to the Palnad Basin have been taken into consideration in interpreting the probable tectonic framework of sedimentation and tectono-environmental classification of sedimentary formations in the western part of the Palnad basin. The Banganpalli quartzites were deposited in the littoral to infra-littoral environment under stable shelf conditions. The Narji limestones were deposited in infra-littoral to neritic environment under stable shelf conditions. Due to uplift the environment changed to infra-littoral and quiet water environment, when the Auk shales were deposited. The Paniam quartzites were deposited in the littoral to infra-littoral environment under stable shelf conditions with minor tectonic instability in certain local areas where positive elements were active during the uplift of the basin. The Kundair limestones and shales were deposited in neritic zones under reducing environment on stable shelf.

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