Distribution and cementation characteristics of beachrocks along southern, southwestern and western coast of Sri Lanka

Nayanthara, Pahala Ge Nishadi; Dassanayake, Anjula Buddhika Nayomi; Nakashima, Kazunori; Kawasaki, Satoru

Distribution and cementation characteristics of beachrocks along southern, southwestern and western coast of Sri Lanka

Nayanthara, Pahala Ge Nishadi; Dassanayake, Anjula Buddhika Nayomi; Nakashima, Kazunori et al.

Journal of sedimentary environments, 2021, 6(1), 93-106

Permalink : https://hdl.handle.net/2115/80425

このアイテムのアクセス数:455件（2026-08-07 20:04 集計）

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https://doi.org/10.1007/s43217-020-00036-1			13

論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/80425
タイトル	Distribution and cementation characteristics of beachrocks along southern, southwestern and western coast of Sri Lanka
著者	Nayanthara, Pahala Ge Nishadi ; Dassanayake, Anjula Buddhika Nayomi ; Nakashima, Kazunori ; Kawasaki, Satoru
著者名 Nayanthara, Pahala Ge Nishadi
著者名 Dassanayake, Anjula Buddhika Nayomi
著者名 Nakashima, Kazunori
e-Rad_Researcher 00304022 著者名 Kawasaki, Satoru
言語	英語
キーワード	Beachrocks
	Carbonate cements
	Marine phreatic precipitation
	Microfabrics and textures
	Spectroscopic analysis
発行日	2021-03
出版者	Springer
収録物名	Journal of sedimentary environments
巻(号)	6(1)
ページ	93-106
抄録	Beachrocks are sedimentary structures where gravelly or sandy beaches have been transformed into rock outcrops formed through precipitation of connective cements amid their interstices. They are well-noted coastal features along the coastal belt of Sri Lanka due to the prevalent tropical climate. This study was aimed at gathering data on surface nature and cementation characteristics of beachrock occurrences along a part of Sri Lankan shoreline through field observations and a series of analyses including X-ray diffraction, X-ray fluorescence, scanning electron microscopy (SEM) techniques and petrographic thin-section analysis. The combined research findings from different techniques are also employed as a preliminary step to determine the formation mechanism of the studied beachrocks. The seaward-inclined low-angle beds running parallel to present shoreline are composed mostly of sandstone with occasional conglomerate. Almost all the beachrocks are made of quartz grains amalgamated by cement. One remarkable feature of Sri Lankan beachrocks is the presence of heavy minerals generally in thin lamina form. The cementing agents are predominantly composed of metastable carbonate phases, high magnesium calcite (HMC) and aragonite (Ar) with varying microfabrics and textures. From SEM examinations and thin-section images, main morphologies identified are acicular Ar, scalenohedral magnesium calcites along with bridge cements and micritic coatings which are typical of a marine-phreatic precipitation with the exception of occasional meniscus cements. Further, the presence of evidences of living organisms may be an indication of influence from the biological aspects which can be confirmed by more detailed analyses.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution 4.0 International
PISSN	2662-5571
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1007/s43217-020-00036-1