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

T. R. Anantharamu ¹, K. N. Nagaraja Rao ¹, G. V. Devapriyan ¹

Affiliations
1 Geological Survey of India, Bangalore, IN

Abstract

No Abstract.

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T. R. Anantharamu ¹, K. N. Nagarna Rao ², Manjunatha ³, Shafeeq Ahmed ⁴, T. K. Gandhi Prasad ⁵, T. Gopal Reddy ⁵, S. P. Venkata Dasu ⁶, E. B. Sugavanam ⁷

Affiliations
1 No.53, 9th 'E' Cross, S.B.I. Colony, J.P. Nagar I Phase. Bangalore -560078, IN
2 No. 693, Yelahanka, Bangalore- 560064, IN
3 No. 60, II main road, B.S.K. III Stage, III Phase, Bangalore-560085., IN
4 No.45/J, Marappa bLock,J. C. Nagar, Bangalore-560006, IN
5 Flat 202, Sandhyagiri Apartments, Kalyan Nagar, Hyderabad-500068, IN
6 7th Main, Padmanabhanagar, Bangalore- 560070, IN
7 54F, Venkatapuram, Shankernagar, Salem -636007, IN

Abstract

Several lensoid bodies of carbonatite occur within a wide zone of fenitisation in the granulite terrain of Kollegal taluk, Karnataka. These are emplaced along deep NNE-SSW fracture system and are associated with pyroxenite, talc-tremolite schist showing varying degree of fenitisation. The sovite and beforsite varieties show high percentage of SiO₂ due to contamination during emplacement The Fe₂0 ₃ , MnO and MgO values of Ajjipuram carbonatites broadly compare with the Koratti carbonatites occurring on the eastern part ofthe mobile belt with similar tectonic history.

Keywords

Carbonatites, Kollegal Taluk, Karnataka.

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T. R. Anantharamu ¹

Affiliations
1 Geological Survey of India, Operations Karnataka & Goa, IV Block, Jayanagar Shopping Complex, Bangalore - 560 011, IN

Abstract

No Abstract.

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S. V. Srikantia ¹, T. R. Anantharamu ²

Affiliations
1 A-201, Ushas Apts. 26, 16th Main, Jayanagar IV Block, Bangalore - 560 011, IN
2 Geological Survey of India, Kumaraswamy Layout, Bangalore - 560 078, IN

Abstract

Situated along the left bank of the river Cauvery, Talakad represents a typical riverine sand dune. The point bar deposit along the left bank of the Cauvery is the main source of the sand. However, this stretch, in the upstream has a weir built some 400 years ago which diverted water from the Cauvery into the Madha vamantri canal, which resulted in the lowering of the level of water in the point bar deposit downstream thereby exposing its sand to monsoonic winds blowing from SW to NE towards Old Talkad. The settlements and also the NW to SE blowing cross wind in the valley acted as barriers for the sand laden monsoonic winds with the consequent development of sand dunes which on gradual migration buried temples and many old settlements.

Keywords

Geomorphology, Sand Dunes, River Cauvery, Karnataka.

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