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Microtexture and grain size characteristics of lagoonal and riverine coastal deposits along the southeastern coast of Sri Lanka: implication for paleoenvironment by Chaturanga Sandaruwan; Nadeesha Madugalla; Madurya Adikaram; Amarasooriya Pitawala; Tharanga Udagedara is a Earth and Planetary Sciences article available to read on EtoBox.

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Beach placers are concentrations of economically potential minerals formed by surface earth processes and are identified as one of the most easily exploitable mineral deposits in the world. We studied the placer and non-placer sediments in lagoonal and riverine beaches of the southeastern part of Sri Lanka to unravel their specific sedimentary features, depositional settings and paleoenvironments. Swash zone deposits (105) were investigated for their surface microtextures, granulometry and their identification. Near the lagoonal outlets, black-coloured placers are reported with abundant ilmenite and accessory zircon, while red-coloured almandine placers are founded in the riverine areas. Placer deposits are composed of coarse-skewed leptokurtic to platykurtic fine sand and evidenced for dominant bottom suspension mechanisms on the weak wave-generated depositional agent. Quartz grains (240) from placer and siliciclastic sediments showed the presence of 25 pre-defined microtextures indicating the influences from sub-aqueous beach, fluvial, aeolian and chemical alteration processes. From siliciclastic to red placer to black placer sediments, decreasing order of source-sink distance an

Who reads Microtexture and grain size characteristics of lagoonal and riverine coastal deposits along the southeastern coast of Sri Lanka: implication for paleoenvironment?

Author

Chaturanga Sandaruwan; Nadeesha Madugalla; Madurya Adikaram; Amarasooriya Pitawala; Tharanga Udagedara

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)