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Carbonate cements in contemporaneous beachrocks, Jaguaribe beach, Itamaracá island, northeastern Brazil: petrographic, geochemical and isotopic aspects Anais da ABC (AABC)
Guerra,Núbia C.; Kiang,Chang H.; Sial,Alcides N..
Holocene beachrocks of the Jaguaribe beach, State of Pernambuco, northeastern Brazil, consist of horizontal, cemented layers approximately 40 cm thick. The cement shows three textural varieties: (a) calciferous, surrounding siliciclastic grains, (b) micritic, with an acicular fringe; and (c) cryptocrystalline calcite in pores. Early cementation took place at the water table below beach ridges, where geochemical, hydrodynamic and, perhaps, also microbiological conditions favored rapid precipitation of aragonite and/or high-Mg calcite. delta13C values range from -1.8 to +1.5‰ for dissolved carbonate in interstitial water and from +0.2 to +2.1‰ for bioclastic components. delta18O values range from -2.8 to +0.5‰ for seawater, freshwater and interstitial water....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Beachrocks; Early diagenesis; O and C isotopes; Holocene.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200011
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Implications of the cementation of beach sediments for the recreational use of the beach ArchiMer
Vousdoukas, Michalis; Velegrakis, Adonis F.; Kontogianni, Areti; Makrykosta, Efstratia-natalia.
Beach sediment cementation (beachrock formation) is a sedimentary process that can transform significant sections of beaches into rock outcrops. This contribution reports the results of two questionnaire surveys (one focusing on foreign tourists and the other on local people) carried out in coastal resorts of the island of Lesbos (Greece), on the perceptions of beach users regarding the impacts of beachrocks on their recreational activities. The survey focusing on foreign tourists showed that the majority of the interviewees took notice of the formations and commented negatively on them. Although most of the interviewees did not consider beachrocks a significant safety risk, a considerable proportion of the sample stated that beachrocks influenced their...
Tipo: Text Palavras-chave: Beach management; Beach carrying capacity; Beach safety; Risk perception; Coastal tourism; Beachrocks.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6625.pdf
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