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

Varghese, Tiju I.; Nageshrao, Prakash Thirumali; Nagendra, R.; Nagarajan, R.

doi:10.1007/s12517-018-3406-9

Cited by 10 publications

(3 citation statements)

References 59 publications

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“…Although downstream reaches of the west‐flowing rivers of the WG are consistently affected by severe floods in recent times, the floodplain sedimentation process is relatively poor except for a few stretches (e.g. Varghese et al, 2018). This suggests an alternative explanation that whatever fine fraction of sediment is generated in the upstream part of the rivers, they are being swiftly transported during monsoon season, leaving most of the downstream reaches partially sediment starved.…”

Section: Discussionmentioning

confidence: 99%

“…Although downstream reaches of the west-flowing rivers of the WG are consistently affected by severe floods in recent times, the floodplain sedimentation process is relatively poor except for a few stretches (e.g. Varghese et al, 2018). This suggests an alternative explanation that whatever fine fraction of sed- after Nanson and Croke (1992).…”

Section: Implication Of Bedrock Scaling Relationshipmentioning

confidence: 99%

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Absence of well‐developed floodplains along the lowland rivers and controls of the hydrogeomorphic conditions in the Western Ghat, India

Guha

Kaushal

Jain

2022

Earth Surf Processes Landf

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Lowland rivers across the world are characterized by accumulation of sediment due to a decrease in the channel slope. Despite the antiquity of the topography, the lowland part of the west-flowing rivers of Western Ghat, India is characterized by poorly developed floodplains except for the southern part of the Ghat. This poses a question of the sediment transportation and deposition capacity in these lowland rivers, which in turn governs geomorphic characteristics. In this study, we adapted a novel method to integrate hydrological model-derived discharge estimates, channel slope estimates from digital elevation models, bankfull channel width estimates from high-resolution Google Earth satellite images and field observations. We modelled the downstream distribution of total stream power (Ω), specific stream power (ω) and shear stress (τ b ) for four west-flowing river systems from different lithological and

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Section: Discussionmentioning

confidence: 99%

Section: Implication Of Bedrock Scaling Relationshipmentioning

confidence: 99%

Absence of well‐developed floodplains along the lowland rivers and controls of the hydrogeomorphic conditions in the Western Ghat, India

Guha

Kaushal

Jain

2022

Earth Surf Processes Landf

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“…Similarly, enrichment of Cr, Ga, Ni, Rb, Y, and Zn concentrations in sediments is associated to the weathering of andesite (Saha et al 2018). The correlations between Al 2 O 3 versus Nb, Y, and Zr in the cores GM6 (r = 0.09, − 0.47, and − 0.69, respectively, n = 20) and GM7 (r = 0.26, 0.04, and − 0.36, respectively, n = 20) are not statistically significant, suggesting that Nb, Y, and Zr are linked to the source rocks of intermediate composition and accessory detrital phases such as xenotime and zircon, respectively (Varghese et al 2018). On the other hand, the enrichment of MnO content identified in the core sediments is most likely due to the concentration of manganosite mineral (Figs.…”

Section: Mineralogical Characterizationmentioning

confidence: 96%

Textural and geochemical characteristics of late Pleistocene to Holocene fine-grained deep-sea sediment cores (GM6 and GM7), recovered from southwestern Gulf of Mexico

et al. 2018

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Texture, mineralogy, geochemistry, and 14 C ages of two deep-sea sediment cores (GM6 and GM7) recovered in the southwestern Gulf of Mexico were investigated to infer their provenance and depositional condition. The sediments are enriched in fine-grained silt and clay and poor in sand content. Mineralogically, the sediments consist of quartz, calcite, smectite, and kaolinite. Based on the 14 C data, the age of the GM6 and GM7 sediment cores were calculated as 23,615 cal yrs. BP and 19,007 cal yrs. BP, respectively. The weathering indices such as chemical index of alteration (CIA), chemical index of weathering (CIW), and plagioclase index of alteration (PIA) in GM6 (56-69, 60-74, and 61-73, respectively) and GM7 (54-69, 57-76, and 55-74, respectively) cores revealed a moderate-to-high intensity of weathering. The rare earth element (REE) patterns suggested that the sediments were derived mostly by the weathering of intermediate rocks, exposed along the coastal regions of the Gulf of Mexico. The trace elemental ratios like V/Cr (<2), Ni/Co (<2), and Cu/Zn (<1), authigenic uranium content (<1), and Ce anomaly (Ce/Ce * ≤ 1) suggested that the sediments were deposited under an oxic condition, which was also revealed by the benthic foraminiferal assemblages throughout the GM6 and GM7 sediment cores.

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Geochemical and Sedimentological Signatures of Ariyankuppam and Chunnambar Estuarine Sediments, Pondicherry, India: Implications on Weathering and Provenance

Kirubakaran,

Sridharan,

Nathan

et al. 2023

Journal of the Geological Society of India

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Thirty surface sediment samples collected from Ariyankuppam (N = 12) and Chunnambar estuaries (N = 18) located along the coast of Pondicherry, India, are analyzed to understand the nature of weathering and provenance. The granulometric study reveals that sediments are poorly sorted, positively skewed and platykurtic to leptokurtic in nature. The abundance and inverse relationship of SiO2 with other major oxides signify the detention of silica within quartz. The Index of Chemical Variability (ICV) suggests that sediments are compositionally immature and are derived from less weathered source rock. The weathering indices such as the Chemical Index of Alteration (CIA); Chemical Index of Weathering (CIW); Plagioclase Index of Alteration (PIA), and A-CN-K diagram also suggest less intense weathering of parent rocks. The major and trace element ratios viz. Al2O3/TiO2, TiO2/Zr, Cr/V and Y/Ni and discrimination diagrams indicate that estuarine sediment is derived from felsic and intermediate provenance.

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

Cited by 10 publications

References 59 publications

Absence of well‐developed floodplains along the lowland rivers and controls of the hydrogeomorphic conditions in the Western Ghat, India

Absence of well‐developed floodplains along the lowland rivers and controls of the hydrogeomorphic conditions in the Western Ghat, India

Textural and geochemical characteristics of late Pleistocene to Holocene fine-grained deep-sea sediment cores (GM6 and GM7), recovered from southwestern Gulf of Mexico

Geochemical and Sedimentological Signatures of Ariyankuppam and Chunnambar Estuarine Sediments, Pondicherry, India: Implications on Weathering and Provenance

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