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

M. Ramkumar ¹, P. Sudha Rani ¹, M. S. Gandhi ¹, M. Pattabhi Ramayya ¹, V. Rajani Kumari ¹, K. V. S. Bhagavan ¹, A. S. R. Swamy ¹

Affiliations
1 Delta Studies Institute, Andhra University, Visakhapatnam - 530 003, IN

Abstract

Textural data of the sediments of Godavari delta indicate the control of energy over grain size and other statistical parameters. These parameters also explain the regional energy conditions, which are indicative of many sub-environments. The prime environmental factors viz. transportation, deposition and preservation vary in time and space, which in turn, produce variability as well as shared nature of grain size characteristics. Many sub-environments have similar depositional/energy regimes making their distinction a difficult task. It is also established that only groups of environments could be delineated, rather than individual environments, based on manual observations and discriminant plots of textural data.

Keywords

Texture, Grain Size, Statistics, Sedimentary Environments, Godavari Delta.

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A. S. R. Swamy ¹

Affiliations
1 Geology Department, Andhra University, Visakhapatnam-530 003, IN

Abstract

No Abstract.

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J. Seetharamaiah ¹, A. S. R. Swamy ¹

Affiliations
1 Department of Geology, Andhra University, Visakhapatnam-530 003, A.P., IN

Abstract

Organic matter and calcium carbonate in the shelf sediments off Penner river are mainly controlled by the texture of the sediments. The outer shelf (30-50 m depth) sediments of the southern and northern parts have a higher content of organic matter (1.2 to 2.22%). The sharp differences in organic matter content (varies from 0.8-1.6%) and fine nature of the sediments at the river mouth reveals detrital contribution. A calcium carbonate rich zone (30-40%) associated with coarse sands occurs opposite to Penner river mouth (20-50 m depth). The source for high concentration of calcium carbonate in the coarse sands (relict) are molluscan shells, shell fragments and foraminifera indicative of the in situ origin . It is inferred that the calcium carbonate supports that the coarse sands are stillstand deposits admixtured with present conditions.

Keywords

Sedimentology, Calcium Carbonate, Penner River, East Coast, Andhra Pradesh.

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