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

I. V. Reddy ¹

Affiliations
1 Geological Survey of India, Southern Region, Hyderabad-500 068, IN

Abstract

This note records for the first time the occurrence of ultra-potassic volcanic rocks in the Proterozoic Cuddapah basin. The ultra-potassic rocks occur within the tuffaceous sequence of the Pullampet Formation of Nallamalai Group of Cuddapah Supergroup in the area around Naiduvaripalle in Cheyyeru valley in the Cuddapah district of Andhra Pradesh. Petrographic studies reveal that the rock is aphanitic with phenocrysts of alkali feldspar set in a finely crystalline groundmass of slender feldspar microlites and chlorite. The rock displays typical ultra-potassic chemical characters in having high K₂O>8%, K₂O:Na₂O >25% and MgO >3%.

Keywords

Igneous Petrology, Ultra-Potassic Volcanic Rock, Pullampet Formation, Cuddapah Basin, Andhra Pradesh.

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K. S. Misra ¹, M. R. Hammond ², Anant V. Phadke ³, Fiona Plows ⁴, U. S. N. Reddy ⁵, I. V. Reddy ⁵, Fareeduddin ⁶, G . Parthasarathy ⁷, C. R. M. Rao ⁵, B. N. Gohain ⁸, Dinesh Gupta ⁹

Affiliations
1 Geological Survey of India, Seminary Hills, Nagpur, IN
2 Stanford University, San Fransisco, US
3 Pune University, Pune, IN
4 Cihergen Biosystesms, San Fransisco, US
5 Geological Survey of India, Hyderabad, IN
6 Geological Survey of India, AMSE Wing, Bangalore, IN
7 National Geophysical Research Institute, Hyderabad - 500007, IN
8 Seminary Hills, Nagpur, IN
9 Geological Survey of India, Jaipur, IN

Abstract

The black carbonaceous slates, interbedded within the Proterozoic volcano-Sedimentary sequence of Cuddapah Supergroup in the vicinity of Mangampeta are found to the fullerene bearing and belonging to the shungite suite of rocks. Presence of fullerene in powdered rock samples is identified from the characteristic spectra obtained by laser desorption/Ionization spectrometry. This is further confirmed by making soxhlet extract using toluene and exposing it to different laser powers to avoid any possibility of it being analytical artifact. Both carbon allotrope fullerene C₆₀ and C₇₀ are identified within these rocks. Two geological samples collected from the prominent rock units within this thick sequence of black carbonaceous unit belonging to the shungite suite of rock are found to have fullerenes. This reporting of fullerene is first of its kind from any geological material from India. The only other occurrence of fullerenes in geological samples is recorded from the Shunga locality of the Karelean province of Russia.

Keywords

Fullerenes, Shungite, Carbonaceous Slate, Barite, Mangampeta, Cuddapah District, Andhra Pradesh.

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Suresh Kharkhanis ¹, K. S. Misra , M. R. Hammond , Anant V. Phadke , Fiona Plows , U. S. N. Reddy , I. V. Reddy , Fareeduddin , G. Parthasarathy , C. R. M. Rao , B. N. Gohain , Dinesh Gupta

Affiliations
1 Analytical Research Laboratory, Department of Polymer and Petroleum Engineering, MIT Engineering College, Kothrud, Pune - 411 038, IN

Abstract

No Abstract.

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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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N. Rajendran ¹, I. V. Reddy ²

Affiliations
1 Geological Survey of India, Bangalore, IN
2 Geological Survey of India, Hyderabad, IN

Abstract

No Abstract.

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