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 6 publications

(4 citation statements)

References 44 publications

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“…The results were discussed below based on the following assumptions: I. coastal outcrops arranged in lines parallel to the coast are not necessarily beachrocks (Simioni et al, 2018); II. coastal outcrops resulted from intense sediment remobilization due to sea level fluctuations (Vousdoukas et al, 2007); III.…”

Section: Discussionmentioning

confidence: 99%

“…Usually, cement formed in marine environments has δ 13 C and δ 18 O VPDB values close to zero, whereas those formed in the freshwater environment have more negative values -between −5‰ and −15‰ for δ 13 C and between −5‰ and −10‰ for δ 18 O VPDB . Simioni et al, (2018) compile results with different signatures: marine cements, recent sediments, methane derived cements, early concretions, and meteoric cements. Therefore, the cements here were likely formed in a marine environment, which points in the direction of confirming the classified sedimentary After obtaining the δ 13 C and δ 18 O values, they were used to calculate the Z parameter (Keith and Weber, 1964), a numeric interval of values useful to categorize the samples as derived from saltwater or freshwater environments (Moore and Moore, 2014).…”

Section: Cement δ 18 O and δ 13 C Isotopic Analysesmentioning

confidence: 99%

“…Note that the age values do not correspond to the exact moment of formation of the beachrocks, since the material submitted to dating is generally composed of biological carbonate material previously deposited in the intertidal areas of the beaches. Despite this limitation, beachrocks dating shows satisfactory data on sea level behavior (Simioni et al, 2018.…”

Section: Introductionmentioning

confidence: 99%

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Beachrocks of the northeast of Brazil: local effects of sea level fluctuations in a far-field during in Holocene

Ferreira Júnior,

Stattegger,

Camargo

et al. 2024

Ocean Coast. Res.

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Along the coast of the state of Pernambuco, NE Brazil, the presence of coastal outcrops aligned with the shoreline and distributed above and below the mean sea level is remarkable. These outcrops were sampled, and petrological, isotopic, and geochronological analyses were integrated to investigate the local effects of the Holocene sea-level fluctuations. The results indicate that the rocks are recent (< 8ka), formed by cementation of beach sands (magnesian calcite cement, predominance of quartz and presence of marine bioclasts, signs of compaction, fractures, and dissolution), in a tropical climate and warm waters, which allows to classify them as typical examples of beachrocks. The carbonate cement consisted of Mg-rich calcite with values ranging from −1.1‰ to 3.5‰ for δ 13 C and from −0.9‰ to 0.5‰ for δ 18 O VPDB . These isotopic values are typical of marine carbonate cemented deposits in shallow marine environments under freshwater influence (meteoric vadose environment). In these conditions, the cementing processes occurred in the intertidal zones, which reinforce the use of these data as indicators of ancient sea levels. The sea level fluctuations could be divided, in chronological order, into three different phases, starting with a rapid sea level rise followed by a relative stabilization at a maximum level and, finally, a decreasing phase. Recent sea level fluctuations in Pernambuco are represented by beachrocks with ages between 8 ka and 800 years and a maximum level of 2 to 3 meters above the present mean level. In scenarios of a near future with a general global sea level rise pattern, significant local geomorphological changes may occur, which means a great future challenge to society.

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Section: Discussionmentioning

confidence: 99%

Section: Cement δ 18 O and δ 13 C Isotopic Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Beachrocks of the northeast of Brazil: local effects of sea level fluctuations in a far-field during in Holocene

Ferreira Júnior,

Stattegger,

Camargo

et al. 2024

Ocean Coast. Res.

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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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Late Pleistocene-Holocene fossils from Mirim Lake, southern Brazil, and their paleoenvironmental significance: II – Mollusks

Lopes

Pereira²,

Caron

et al. 2021

Journal of South American Earth Sciences

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

Cited by 6 publications

References 44 publications

Beachrocks of the northeast of Brazil: local effects of sea level fluctuations in a far-field during in Holocene

Beachrocks of the northeast of Brazil: local effects of sea level fluctuations in a far-field during in Holocene

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

Late Pleistocene-Holocene fossils from Mirim Lake, southern Brazil, and their paleoenvironmental significance: II – Mollusks

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