Sediment geochemistry of coastal environments, southern Kerala, India: implication for provenance
| Autor: | Tiju I. Varghese, Nagendra Raghavendramurthy, Nagarajan Ramasamy, Prakash Thirumali Nageshrao |
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| Rok vydání: | 2018 |
| Předmět: |
Provenance
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Floodplain Continental crust Geochemistry Sediment Weathering Silt 010502 geochemistry & geophysics Granulite 01 natural sciences Source rock General Earth and Planetary Sciences Geology 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Arabian Journal of Geosciences. 11 |
| ISSN: | 1866-7538 1866-7511 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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