Os arenitos de praia, ou beachrocks, são sedimentos que sofreram um processo de litificação e são encontrados paralelamente à linha de costa na zona intermaré, apresentando uma forma alongada, estreita e cimentados por carbonato de cálcio. O processo de diagênese consiste na formação da rocha sedimentar propriamente dita a partir da compactação, dissolução, cimentação e recristalização. O estudo da formação e diagênese do arenito de praia são relevantes pois possibilita o entendimento de como as rochas sedimentares detríticas são geradas, além de reconhecer como a variação do nível do mar se comportou durante o Holoceno, permitindo a gênese destas feições que se constituem em relevantes elementos de resguardo das linhas de costas em ambientes majoritariamente tropicais. FORMATION AND DIAGENÈSE IN BEACHROCKS:A Conceptual Review ABSTRACTThe beach sandstones, or beachrocks, are sediments that underwent a lithification process and are found parallel to the coastline in the intertidal zone, presenting an elongated, narrow shape and cemented by calcium carbonate. The process of diagenesis consists on the formation of the sedimentary rock itself, following deposition, compaction, dissolution, cementation and recrystallization. The study of the formation and diagenesis of beach sandstone is relevant since it permits the understanding of how clastic sedimentary rocks are formed, besides with recognizing how sea level variation behaved during the Holocene, thus allowing the genesis of these features that constitute relevant elements of shelter along coastlines in most tropical environments. Keywords: Beachrocks, sedimentary rock, cementation.
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