Applied and Natural Science Foundation
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Journal of Applied and Natural Science
An International Journal | Print ISSN: 0974-9411 | Online ISSN: 2231-5209
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Abstract
Journal of Applied and Natural Science 1(2):180-190(2009)
Organic matter depositional microenvironment in deltaic channel deposits of Mahanadi river, Andhra Pradesh
Anjum Farooqui *, T. Karuna Karudu1 , D. Rajasekhara Reddy 1 and Ravi Mishra 2
Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow, INDIA
1 Delta Studies Institute, AndhraUniversity, Sivajipalem, Visakhapatnam-17, INDIA
2 ONGC, 9, Kaulagarh Road, Dehra dun, INDIA
*Corresponding author. E-mail: afarooqui_2000@yahoo.com
Abstract : Quantitative and qualitative variations in microscopic plant organic matter assemblages and its preservationstate in deltaic channel deposits of Mahanadi River was correlated withthe depositional environment in the ecosystem in order to prepare a modern analogue for use in palaeoenvironment studies. For this, palynological and palynofacies study was carried out in 57 surface sediment samples from Birupa river System, Kathjodi-Debi River system and Kuakhai River System constituting Upper, Middle and Lower Deltaic part of Mahanadi river. The apex of the delta shows dominance of Spirogyra algae indicating high nutrient, low energy shallow ecosystem during most of the year and recharged only during monsoons. The depositional environment is anoxic to dysoxic in the central and south-eastern part of the Middle Deltaic Plain (MDP) and Lower Deltaic Plain (LDP) indicated by high percentage of nearby palynomorphs, Particulate Organic Matter (POM) and algal or fungal spores. The northern part of the delta show high POM preservation only in the estuarine area in LDP but high Amorphous Organic Matter (MOA) in MDP. The sediment here is deposited under dysoxic to oxic fluvial conditions. Thus, the monsoon intensity, direction of fluvial discharge, and the landward extent of sea water incursion through river mouths inducing bottom water salinity play an important role in defining the magnitude of POM and its preservation in the shallow Mahanadi deltaic ecosystem.

Keywords : Palynology, Palynofacies, Mahanadi delta, Surface sediment
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