Multivariate taphonomic analysis of mollusk shell concentrations in Holocene deposits of southern Brazil: An integrated approach

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorBonn Universität-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUniversidade Federal do Rio Grande do Sul (UFRGS)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.creatorPereira, Luiz Gustavo-
Autor(es): dc.creatorFornari, Milene [UNESP]-
Autor(es): dc.creatorErthal, Fernando-
Autor(es): dc.creatorLeme, Juliana Moraes-
Autor(es): dc.creatorGiannini, Paulo César Fonseca-
Data de aceite: dc.date.accessioned2022-02-22T00:48:07Z-
Data de disponibilização: dc.date.available2022-02-22T00:48:07Z-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-01-14-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.palaeo.2020.110085-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/206778-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/206778-
Descrição: dc.descriptionShell concentrations are one of the most distinctive features of the Holocene coastal stratigraphy in the southern portion of Santa Catarina State, southern Brazil. In this paper, we integrated stratigraphic, geochronological, geophysical, and taphonomic data to discuss the processes involved in the genesis of shell concentrations in a siliciclastic and subtropical setting, a useful analogy for ancient shell concentrations in semi-closed environments affected by storms. The data indicated the succession of three facies associations (FA): bay, lagoon, and back-barrier. This succession implies a grain size fining-upward trend that is representative of a gradual shallowing. Interpretation of GPR sections revealed that the passage from the bay to lagoonal deposits occurred by forming a laterally continuous, high-amplitude surface overlain by sigmoidal reflections, which characterized the progressive basinward backstepping of the lagoonal margin. Shell concentrations in bay deposits are an allochthonous product of storm flows in shallow waters. In contrast, accumulations of the bivalve Anomalocardia brasiliana had their valves reworked in the lagoonal margins and transported to the bottom, characterizing a parautochthonous accumulation. In this study, the correlation of taphonomy and grain size indicates that in bay FA, the loss of periostracum is correlated with increased gradients of fine sand, and part of the shell samples correlates to corrosion and abrasion in increased gradients of medium sand and decreased ones of fine sand. Additionally, in the lagoon FA, the loss of periostracum depends on the decrease in mud-enriched sediments and the increase in fine and medium sand, whereas brightness loss and color alteration are related to the increase in fine and medium sand, as well as margin modification. Corrosion was positively correlated to the mud-dominated fraction.-
Descrição: dc.descriptionInstitut für Geowissenschaft Bonn Universität, Nußallee 8-
Descrição: dc.descriptionBiosciences Institute São Paulo State University (UNESP) - Coastal Campus, Praça Infante Dom Henrique s/n. 11330-900, P.O. Box: 73601, São Vicente-
Descrição: dc.descriptionInstituto de Geociências Departamento de Paleontologia e Estratigrafia Universidade Federal do Rio Grande do Sul (UFRGS)-
Descrição: dc.descriptionInstituto de Geociências Programa de Pós-graduação em Geoquímica e Geotectônica Universidade de São Paulo (USP), Rua do Lago 562-
Descrição: dc.descriptionBiosciences Institute São Paulo State University (UNESP) - Coastal Campus, Praça Infante Dom Henrique s/n. 11330-900, P.O. Box: 73601, São Vicente-
Idioma: dc.languageen-
Relação: dc.relationPalaeogeography, Palaeoclimatology, Palaeoecology-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectActuopaleontology-
Palavras-chave: dc.subjectCoastal dynamics-
Palavras-chave: dc.subjectGPR-
Palavras-chave: dc.subjectHolocene-
Palavras-chave: dc.subjectRelative sea-level-
Palavras-chave: dc.subjectSiliciclastic deposits-
Título: dc.titleMultivariate taphonomic analysis of mollusk shell concentrations in Holocene deposits of southern Brazil: An integrated approach-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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