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Sediment geochemistry of coastal environments, southern Kerala, India: implication for provenance

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Abstract

Late Quaternary sediments representing the floodplain, estuary and offshore environments of southern Kerala were investigated to infer provenance. The grain size reveals the dominance of sand to silty clay, clay to clayey silt and clayey silt in the floodplain, estuary and offshore sediments, respectively. The chemical index of alteration (CIA) values and A-CN-K plot attributes to high, moderate and low weathering in floodplain, estuary and offshore regions, respectively. The SiO2/Al2O3 values lesser than Post-Archean Australian Shale indicate low to moderate maturity for the estuarine and offshore sediments. The geochemical immaturity indicates its derivation from low to moderately weathered source rocks. The major and trace elemental ratios and discriminant function diagrams attribute that the sediments were derived from intermediate to felsic source rocks. The enrichment of Cr and Ni concentration in the sediments compared to the upper continental crust, related to the contribution of orthopyroxenes, weathered from charnockite and garnets from the granulite terrain, respectively.

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Acknowledgements

The authors are grateful to the Director, NCESS for the facilities and support. This work forms the part of the Department of Science and Technology (DST)-sponsored project (SR/S4/ES-310/2007). TIV is thankful to DST for the fellowship in carrying out this work. Authors are thankful to Mr. Arun J. John, Mrs. Krishna R. Prasad and Mr. Anish S. Anand for their support and help in this study. We extend our utmost appreciation to the anonymous reviewers and the Associate Editor (Dr. J.S. Armstrong-Altrin) for giving valuable comments and suggestions to improve the paper and Chief Editor for his support during revision of the manuscript.

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  1. Coastal Processes Group, National Centre for Earth Science Studies, Thiruvananthapuram, 695 011, India

    Tiju Itty Varghese & Prakash Thirumali Nageshrao

  2. Department of Geology, Anna University, Chennai, 600 025, India

    Nagendra Raghavendramurthy

  3. Department of Applied Geology, Curtin University, Miri, Sarawak, Malaysia

    Nagarajan Ramasamy

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  1. Tiju Itty Varghese
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Varghese, T.I., Nageshrao, P.T., Raghavendramurthy, N. et al. Sediment geochemistry of coastal environments, southern Kerala, India: implication for provenance. Arab J Geosci 11, 61 (2018). https://doi.org/10.1007/s12517-018-3406-9

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