Cement fabrics and optical luminescence ages of beachrock, North Cyprus: Implications for Holocene sea-level changes

Öztürk, Muhammed Zeynel; Ergi̇nal, Ahmet Evren; Kıyak, Nafiye Güneç; Öztürk, Tuğba

doi:10.1016/j.quaint.2015.03.024

Cited by 20 publications

(13 citation statements)

References 43 publications

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“…2d). This is similar to beachrocks of conglomerates in Cyprus as reported by Ozturk et al (2016). According to Psomiadis et al (2014), the presence of pebbles in beachrocks can be attributed to either one of the following reasons: (i) a high-energy period (ii) the beachrock sediments been lithified in a different location than current sampling location, (iii) an early stage of coastal maturity.…”

Section: Morphology and Surface Nature Of Beachrockssupporting

confidence: 79%

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

Nayanthara

Dassanayake

Nakashima

et al. 2020

J. Sediment. Environ.

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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.

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Section: Morphology and Surface Nature Of Beachrockssupporting

confidence: 79%

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

Nayanthara

Dassanayake

Nakashima

et al. 2020

J. Sediment. Environ.

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“…Frechen et al, 2004;Armitage et al, 2006;Reimann et al, 2011;Mauz et al, 2010;Thiel et al, 2015). The method has also been successfully used to date beachrocks for the reconstruction of palaeoshorelines along the Brazilian coast (Barreto et al, 2002;Tatumi et al, 2003), India (Thomas, 2009), andthe Mediterranean (Erginal et al, 2010;Mauz et al, 2015b;Ozturk et al, 2016) and the results were also compared with absolute/independent dating methods, such as radiocarbon.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Tracking shoreline evolution in central Cyclades (Greece) using beachrocks

et al. 2017

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“…These proxies include shoreline shifts and subsequent vertical variations in sedimentary facies [4][5][6][7], temporal variations of microfossils [8,9], beachrocks, marine notches and raised coral reefs [10][11][12][13][14]. Recent descriptions of coastal sedimentology of the tropics and warm temperate zones render beachrocks as potentially useful indicators of sea level and climatic changes and former paleoshoreline positions [13,15,16]. Beachrocks are an outstanding sea level proxy since they hold information on not only the vertical but also the lateral evolution of the shoreline [17,18].…”

Section: Introductionmentioning

confidence: 99%

Beachrock as a Paleoshoreline Indicator: Example from Wadi Al-Hamd, South Al-Wajh, Saudi Arabia

Mannaa

Haredy

Ghandour

2021

JMSE

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The present study concerns the Holocene inland beachrocks that are exposed in the Red Sea coastal plain at the mouth of Wadi Al-Hamd, South Al-Wajh City, Saudi Arabia, and their utility as an indicator for Holocene climate and sea level changes. In addition, the framework composition, and carbon and oxygen isotopic data, are employed to interpret the origin of their cement. The beachrock consists mainly of gravel and coarse-grained terrigenous sediments dominated by lithic fragments of volcanic rocks, cherts and rare limestones along with quartz, feldspars and traces of amphiboles and heavy minerals. In addition, rare skeletal remains dominated by coralline algae, benthic foraminifera and mollusca remains are recognized. The allochems are cemented by high Mg-calcite (HMC) formed mainly in the intertidal zone under active marine phreatic conditions. The cement takes the form of isopachous to anisopachous rinds of bladed crystals, micritic rim non-selectively surrounding siliciclastic and skeletal remains, and pore-filling micrite. Pore-filling micrite cement occasionally displays a meniscus fabric, suggesting a vadose environment. The δ18O and δ13C values of carbonate cement range from −0.35‰ to 1‰ (mean 0.25‰) and −0.09‰ to 3.03‰ (mean 1.85‰), respectively, which are compatible with precipitation from marine waters. The slight depletion in δ18O and δ13C values in the proximal sample may suggest a slight meteoric contribution.

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Cement fabrics and optical luminescence ages of beachrock, North Cyprus: Implications for Holocene sea-level changes

Cited by 20 publications

References 43 publications

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

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

Tracking shoreline evolution in central Cyclades (Greece) using beachrocks

Beachrock as a Paleoshoreline Indicator: Example from Wadi Al-Hamd, South Al-Wajh, Saudi Arabia

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