Genesis of submerged sandstones in Paraná State continental shelf, Southern Brazil, based on cementation patterns, ages and stable isotopes

Simioni, Bruno Ivan; Ângulo, Rodolfo José; Veiga, Fernando Alvim; Oliveira, Luiz Henrique Sielski de; Souza, Marilei de Melo Tavares e

doi:10.1590/s1679-87592018019306603

Cited by 5 publications

(1 citation statement)

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“…Beachrocks formation is apparently restricted to foreshore settings, as result of precipitation of calcium carbonate dissolved in seawater, under influence of phreatic water and mean annual temperatures > 20ºC (Russell, 1962;Stoddart & Cann, 1965). Recent beachrock formations occur only in tropical areas of the coast from 4° to 16°S, but beachrocks of late Pleistocene-Holocene age are found along the southeastern and southern coasts, from the Rio de Janeiro to Rio Grande do Sul states (Mabesoone, 1964;Delaney, 1965;Suguio, 2001;Malta & Castro, 2018;Simioni et al, 2018). Considering their association with tropical settings, the beachrocks found in subtropical areas of the Brazilian coast are relevant from a paleoclimatic standpoint.…”

Section: Introductionmentioning

confidence: 99%

Paleoecological characterization of ostracods in beachrocks from the Northern sector of the Rio Grande do Sul Coastal Plain, Brazil

Bergue¹,

Lopes²,

Caron³

et al. 2022

Rev. bras. paleontol.

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A micropaleontological analysis on 15 beachrock samples from the Northern sector of Rio Grande do Sul Coastal Plain (RSCP ), southern Brazil , revealed a relatively diverse and well-preserved ostracod assemblage composed of 16 species , including Cyprideis multidentata Hartmann, Callistocythere nucleoperiscum Whatley et al., Cytheretta punctata Sanguinetti, Caudites ohmerti Coimbra & Ornellas , and Argenticytheretta levipunctata Sanguinetti et al. Eleven ostracod species are left in open nomenclature or tentatively identified . Besides ostracods , some foraminifers , echinoderm spines, and fish remains (teeth) were also recovered ; however , the scarcity of specimens or poor preservation precluded identification at species level. Based on the Ostracoda taxonomic composition it is proposed that the beachrocks characterize environmentally condensed assemblages . This preliminary study reveals the importance and potentiality of micropaleontology for understanding the processes involved in the formation of beachrocks. Keywords: Pelotas Basin, Quaternary, coastal environments, micropaleontology, taphonomy.

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