Genesis of beachrock in coast of Pernambuco interpreted by isotopic studies

Authors

  • Antonio Vicente Ferreira Jr Laboratório de Oceanografia Geológica (LABOGEO), Departamento de Oceanografia, UFPE
  • Tereza Cristina Medeiros de Araújo Laboratório de Oceanografia Geológica (LABOGEO), Departamento de Oceanografia, UFPE
  • Alcides Nóbrega Sial NEG-LABISE, Departamento de Geologia, UFPE.

DOI:

https://doi.org/10.5380/abequa.v4i1-2.29525

Keywords:

Beachrocks, cementation, isotopic composition

Abstract

This study is a paleoenvironmental and paleoclimatic analysis of beachrocks through oxygen and carbon isotopes on its cement. The beachrocks have from 60% to 85% of its basis formed by detrital grains of quartz and its carbonate cement is composed by Magnesium-rich calcite. Isotopic values from -1.1‰ to 3.5‰ were obtained for d13C and from -0.9‰ to 0.5‰ for d18OVPDB. Those values are typical of those from sea carbonate cement deposited on shallow marine environment and under the influence of fresh water (meteoric vadose environment), which causes cementation on the foreshore zone. Paleotemperature of the beachrock cement ranged from 22.9ºC to 28.2ºC. This variation is due to the rise of the precipitation depth of the cement and indicates that the water temperature was fairly constant during the process of deposition of the carbonate cement.

Author Biography

Antonio Vicente Ferreira Jr, Laboratório de Oceanografia Geológica (LABOGEO), Departamento de Oceanografia, UFPE

Possui graduação em Geografia (Bacharelado) pela Universidade Federal da Paraíba (2002), mestrado em Geodinâmica e Geofísica pela Universidade Federal do Rio Grande do Norte (2005) e doutorado em Geociências pela Universidade Federal de Pernambuco (2010). Atualmente é professor adjunto da Universidade Federal de Pernambuco, Departamento de Oceanografia, área de Oceanografia Geológica.

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How to Cite

Ferreira Jr, A. V., Araújo, T. C. M. de, & Sial, A. N. (2013). Genesis of beachrock in coast of Pernambuco interpreted by isotopic studies. Quaternary and Environmental Geosciences, 4(1-2). https://doi.org/10.5380/abequa.v4i1-2.29525

Issue

Vol. 4 No. 1-2 (2013)

Section

Artigos

License

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