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Authors
Affiliations
1 Department of Geology, College of Engineering, Guindy, Anna University, Chennai-600025, IN
2 Department of Applied Geology, University of Madras, Guindy Campus, Chennai-600025, IN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 1 (2016), Pagination: 43-51
Abstract
Geoscientists are using many different approaches to study the deep-sea sediment cores. The various elements in the sediments help to determine how far terrigenous particles might have been transported from where they originated on the continent as a weathering product. Ocean sediments are the final product of weathering and of biogeochemical processes occurring in the ocean. This makes deep-sea sediment composition also a record of climate change on earth. The Weathering Indices are tools to calculate the weathering intensity of the sediments. Within this view, core sediments were collected from Bay of Bengal, off Cuddalore at the depth of 2591 m and the sub-samples with an interval of 5 cm. The textural study clearly indicates that the core sediments dominate with high amount of mud (Silt+Clay). From the correlation analyses, Al2O3 is found to be strongly correlated with Iron, Calcium and Magnesium Oxides. Weathering indices such as Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), and Plagioclase Index of Alteration (PIA) were evaluated. CIA values (60.65%) indicate moderate chemical weathering of the source rock under tropical to subtropical climatic conditions. PIA values (62.83%) off Cuddalore indicate the presence of plagioclase feldspars in core sediments.
Keywords
Weathering Indices, Major Oxides, CIA, PIA and Off Cuddalore.
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