Geological and taphonomic significance of electron spin resonance (ESR) ages of Middle-Late Pleistocene marine shells from barrier-lagoon systems of Southern Brazil

Lopes, Renato Pereira; Pereira, Jamil Corrêa; Kinoshita, Ângela; Mollemberg, Michelle; Barbosa, Fernando Henrique de Souza; Baffa, Oswaldo

doi:10.1016/j.jsames.2020.102605

Cited by 18 publications

(28 citation statements)

References 63 publications

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“…The innermost part of the plain, close to the rocky basement, consists of alluvial fans systems of Miocene-Pleistocene age (Closs, 1970), and four lagoonbarrier systems formed by glacioeustatic oscillations directly related to three Pleistocene and one Holocene interglacial marine isotope stages (MIS). The Lagoon-Barrier I System was presumably deposited during the MIS 11 (Villwock & Tomazelli, 1995), but numerical ages are not available so far, and the System II might have been formed during the MIS 9 (Villwock & Tomazelli, 1995), although numerical ages suggest a MIS 7 age (Lopes et al, 2014(Lopes et al, , 2020, which could indicate a MIS 9 age for the System I (Rosa et al, 2017). The System III was deposited during the MIS 5, and the system IV during the MIS 1 (Villwock et al, 1986;Villwock & Tomazelli, 1995;Dillenburg & Barboza, 2014).…”

Section: Study Areamentioning

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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Section: Study Areamentioning

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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“…Several numerical ages indicate that the Barrier-Lagoon Systems II and III are chronocorrelated to the Pleistocene interglacial marine isotope stages (MIS) 7 and 5, respectively (Buchmann and Tomazelli 2003, Lopes et al 2014a, 2015, 2020c, and the system IV to the Holocene interglacial MIS 1 (Buchmann et al 1998, Caron 2007, Lima et al 2013. The Chuí Formation originally described by Delaney (1965) encompassed all Pleistocene marine deposits of the CPRS (e.g., Soliani Jr. 1973, Poupeau et al 1988, but now is recognized as the marine deposits of the Barrier System III .…”

Section: Geological Settingmentioning

confidence: 99%

The Santa Vitória Alloformation: an update on a Pleistocene fossil-rich unit in Southern Brazil

et al. 2021

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The Santa Vitória Formation is a lithostratigraphic unit known for its fossil assemblage of Pleistocene mammals, established in 1973 from sediments exposed along the banks of Chuí Creek, in the southern coastal plain of the state of Rio Grande do Sul (CPRS), Brazil. The original description was presented in a Masters' dissertation and never formally described in a peer-reviewed publication. Moreover, surveys and fossil collecting efforts developed in the last decade have led to a better understanding of its origin and nature. An updated description of this unit is presented here, which outcrops in areas occupied by barrier-lagoon depositional systems originated by eustatic oscillations. The formation encompasses Middle-Upper Pleistocene fluvial and eolian depositional systems and paleosols formed chiefly of fine to medium quartz sand, with subordinate clay, concentrations of iron and manganese oxides, and caliche nodules of pedogenic origin. It conformably overlies upper shoreface-foreshore marine deposits, and is overlain by loess deposited during the last glacial period. Here is proposed to re-define it as Santa Vitória Alloformation, considering that the use of an allostratigraphic framework to characterize this unit has the practical purpose of grouping depositional systems genetically unrelated to the barrier-lagoon systems.

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“…), cobertos por um manto de areias eólicas. Correlacionavel aos depósitos muito semelhantes, que ocorrem, ao longo de quase toda a costa brasileira, a idade deste sistema tem sido considerada como de 125 ka AP, subestágio isotópico de oxigenio 5e, corroborada por idades obtidas por Lopes et al (2020).…”

Section: Sistema Laguna-barreira Holocênicounclassified

Crono-correlação entre as Bacias do Camaquã (RS) e do Itajaí (SC): implicações Paleoambientais e Paleogeográfica

Paim¹,

Chemale²,

Lehn³

et al. 2021

Contribuições À Geologia Do Rio Grande Do Sul E De Santa Catarina

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Fotogra ia aeŕea do setor norte da Serra do Segredo, em Caçapava do Sul, RS, onde se destacam a Pedra do Segredo, em primeiro plano, e a Pedra da Abelha, logo à esquerda, geoformas esculpidas sobre conglomerados luviais da Bacia do Camaquã. Ao fundo, alguns cerros formados por rochas metamór icas e o imponente alto de Caçapava, sobre granitoides diversos, rochas que registram diferentes momentos do Ciclo Brasiliano no sul do Brasil. A paisagem faz parte do Geoparque Caçapava Aspirante Unesco e é parcialmente inserida no Parque Natural Municipal da Pedra do Segredo. Imagem obtida por Felipe Guadagnin. Legenda de André Weissheimer de Borba e Felipe Guadagnin.

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Geological and taphonomic significance of electron spin resonance (ESR) ages of Middle-Late Pleistocene marine shells from barrier-lagoon systems of Southern Brazil

Cited by 18 publications

References 63 publications

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

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

The Santa Vitória Alloformation: an update on a Pleistocene fossil-rich unit in Southern Brazil

Crono-correlação entre as Bacias do Camaquã (RS) e do Itajaí (SC): implicações Paleoambientais e Paleogeográfica

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