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The coastal barrier of Pinheira is located in the South-Central coast of Santa Catarina State. Its morphology and stratigraphy are typical of a regressive barrier. During the Late Holocene (last 6-5 cal ka) the barrier has prograded approximately 5,500 meters. Its progradation was determined by both a sea-level fall of 2 meters and an expressive transference of sands from the adjacent continental shelf into the beach system of the barrier. In the last 3,000 meters of progradation, corresponding to the last 3 cal ka, approximately 60 foredune ridges were formed, each ridge corresponding in average to a time interval of 50 years. The study of the granulometric properties of the modern beach-dune system, and of two old foredune ridges called intermediate and inner ridges, respectively formed at 750 and 3,000 cal years BP, has demonstrated that in the last 3 ka cal these properties have not changed significantly. This behavior is being explained by the policyclic nature of the sands consumed in the progradation, and/or by a constant or even a little change on the general dynamic conditions of the beach-dune system of the Pinheira embayment. The comparative study among the sub-environments (beach face, berm and foredune) has shown that standard deviation and skewness are potentially important sediment properties on the distinction between aeolian (foredunes) and beach (beach face) deposits.

Variações das propriedades granulométricas da barreira costeira da Pinheira (SC) durante a sua progradação no Holoceno Superior