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

K. T. Damodaran

Abstract

No Abstract.

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Syriac Sebastian ¹, Roy George ¹, K. T. Damodaran ¹

Affiliations
1 Marine Geology Division, School of Marine Sciences, Cochin 682016, IN

Abstract

Sediment samples collected from selected stations in the Mahe estuary during the pre- and post-monsoon periods were analysed for their texture, organic matter and carbonate content. It is observed that finer sediments, mainly clayey silt, constitute the major part of the estuarine substratum. Organic matter in the bulk sediments generally follows the distribution pattern of the sediments, i.e., finer the texture greater the organic matter content, whereas the carbonate content shows an inverse relation with the texture. Studies on seasonal variations show that the post-monsoon sediments have higher proportions of organic matter (average: 4.12%) and carbonate (average: 5.23%) content more than those of pre-monsoon periods. No significant relationship between organic matter and carbonate content is observed during pre-monson (r = -0.35) and postmonsoon (r = -0.27) periods.

Keywords

Marine Geology, Mahe Estuary, Sedimentary Geology, Kerala.

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Ajith G. Nair ¹, K. T. Damodaran ², D. S. Suresh Babu ¹

Affiliations
1 Centre for Earth Science Studies, P.B. No.7250, Akkulam, Thiruvananthapuram-695031., IN
2 Marine Geology Division, School of Marine Sciences, Cochin University of Science and Technology, Kochi-682016, IN

Abstract

Characterisation of ilmenite collected from the source to the mouth of the River Valliyar shows progressive alteration with the exception of a junction. where a major tributary joins the main stream. Mineralogical and compositional comparison between alluvial ilmenites and those collected from the beach sediments of adjoining area indicates that the River Valliyar partly contributes to the enrichment of the Manavalakurichi deposit. FeO/Fe₂O₃ and Ti/(Ti+Fe) ratios along with ore microscopic and XRD studies confirm the degree of alteration in the ilmenites of the study area.

Keywords

Weathering, Ilmenite, Placer, Manavalakurichi, Tamil Nadu.

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