Tuesday, July 15, 2014

Highlights—Beach Ridges

Questions of how shorefaces respond to relative rises in sea level are of paramount importance for predicting morphosedimentary response to rising global sea level. In this study, Gzam and others examine a suite of beach ridges along the Tunisian coast to better understand their genesis and dynamics. The results, which integrate petrographic and facies analysis, transverse profile surveys, and field observations, suggest that these progradational, Mid-Holocene to recent beach ridges formed during periods of relative highs in sea level. The data also reveal that the modern beach ridge is composed mainly of shell debris, whereas the Holocene succession consists of siliciclastic sand, suggesting that beach ridges were nourished from two distinctive sediment sources.

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