Phytoliths indicate environmental changes correlated with facies analysis in a paleo island-lake, Upper Paraná River, Brazil
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.jsames.2020.102513 http://hdl.handle.net/11449/198499 |
Resumo: | Phytolith analysis has become a useful tool for paleoenvironmental studies. Phytoliths are produced by plants and are composed of biogenic silica, giving them higher resistance to diagenetic and oxidation processes that commonly occur in tropical sediments. Here, we analyzed the preserved phytolith assemblages in a sedimentary core recovered from an island in the Upper Paraná River. Deposition and preservation of distinctive phytoliths of different vegetation types in the sedimentary facies have provided evidence of the formation of the fluvial island and the floral succession since the Late Pleistocene. Three distinctive phases were described in the island formation. The sandy base (Sr facies) of the core (240 cm) was dated to 14,620 cal yr BP. Most phytoliths in this phase were characteristic of the Podostemaceae family -- aquatic plants adapted to intense water flow. At 97 cm depth, organic sedimentary facies (Fm facies) were dated to 7382 cal yr BP. At this phase, the phytolith assemblage is composed mainly of parallelepipedal bulliform, cuneiform bulliform, and elongate psilate; such morphotypes are primarily produced by grasses. Towards the core top is a layer of massive fine sediments (Vm facies) with greater abundance of plant fragments. The assemblage is composed of short cells, predominantly the bilobate morphotype, which is characteristic of the Panicoideae subfamily (Poaceae) and indicative of soil humidity. |
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Phytoliths indicate environmental changes correlated with facies analysis in a paleo island-lake, Upper Paraná River, BrazilAnabranching channelFacies analysisFluvial environmentPhytolithsQuaternaryPhytolith analysis has become a useful tool for paleoenvironmental studies. Phytoliths are produced by plants and are composed of biogenic silica, giving them higher resistance to diagenetic and oxidation processes that commonly occur in tropical sediments. Here, we analyzed the preserved phytolith assemblages in a sedimentary core recovered from an island in the Upper Paraná River. Deposition and preservation of distinctive phytoliths of different vegetation types in the sedimentary facies have provided evidence of the formation of the fluvial island and the floral succession since the Late Pleistocene. Three distinctive phases were described in the island formation. The sandy base (Sr facies) of the core (240 cm) was dated to 14,620 cal yr BP. Most phytoliths in this phase were characteristic of the Podostemaceae family -- aquatic plants adapted to intense water flow. At 97 cm depth, organic sedimentary facies (Fm facies) were dated to 7382 cal yr BP. At this phase, the phytolith assemblage is composed mainly of parallelepipedal bulliform, cuneiform bulliform, and elongate psilate; such morphotypes are primarily produced by grasses. Towards the core top is a layer of massive fine sediments (Vm facies) with greater abundance of plant fragments. The assemblage is composed of short cells, predominantly the bilobate morphotype, which is characteristic of the Panicoideae subfamily (Poaceae) and indicative of soil humidity.Postgraduate Program in Ecology of Inland Waters State University of MaringáPostgraduate Program in Geography Federal University of Mato Grosso do SulLaboratory of Paleoenvironmental Studies State University of ParanáPostgraduate Program in Geography State University of Western Paraná, Marechal Cândido RondonGrupo de Estudos Multidisciplinares do Ambiente (GEMA) State University of MaringáLaboratory of the Geoscience Applied Center UNESPetro Geoscience and Exact Science Institute (IGCE) São Paulo State University (UNESP)Laboratory of the Geoscience Applied Center UNESPetro Geoscience and Exact Science Institute (IGCE) São Paulo State University (UNESP)State University of MaringáFederal University of Mato Grosso do SulState University of ParanáState University of Western ParanáUniversidade Estadual Paulista (Unesp)Rasbold, Giliane GessicaStevaux, José CândidoParolin, MauroLeli, Isabel TeresinhaLuz, Leandro DomingosBrito, Hermes Dias [UNESP]2020-12-12T01:14:35Z2020-12-12T01:14:35Z2020-04-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.jsames.2020.102513Journal of South American Earth Sciences, v. 99.0895-9811http://hdl.handle.net/11449/19849910.1016/j.jsames.2020.1025132-s2.0-85079181566Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of South American Earth Sciencesinfo:eu-repo/semantics/openAccess2021-10-22T13:12:45Zoai:repositorio.unesp.br:11449/198499Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-22T13:12:45Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Phytoliths indicate environmental changes correlated with facies analysis in a paleo island-lake, Upper Paraná River, Brazil |
title |
Phytoliths indicate environmental changes correlated with facies analysis in a paleo island-lake, Upper Paraná River, Brazil |
spellingShingle |
Phytoliths indicate environmental changes correlated with facies analysis in a paleo island-lake, Upper Paraná River, Brazil Rasbold, Giliane Gessica Anabranching channel Facies analysis Fluvial environment Phytoliths Quaternary |
title_short |
Phytoliths indicate environmental changes correlated with facies analysis in a paleo island-lake, Upper Paraná River, Brazil |
title_full |
Phytoliths indicate environmental changes correlated with facies analysis in a paleo island-lake, Upper Paraná River, Brazil |
title_fullStr |
Phytoliths indicate environmental changes correlated with facies analysis in a paleo island-lake, Upper Paraná River, Brazil |
title_full_unstemmed |
Phytoliths indicate environmental changes correlated with facies analysis in a paleo island-lake, Upper Paraná River, Brazil |
title_sort |
Phytoliths indicate environmental changes correlated with facies analysis in a paleo island-lake, Upper Paraná River, Brazil |
author |
Rasbold, Giliane Gessica |
author_facet |
Rasbold, Giliane Gessica Stevaux, José Cândido Parolin, Mauro Leli, Isabel Teresinha Luz, Leandro Domingos Brito, Hermes Dias [UNESP] |
author_role |
author |
author2 |
Stevaux, José Cândido Parolin, Mauro Leli, Isabel Teresinha Luz, Leandro Domingos Brito, Hermes Dias [UNESP] |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
State University of Maringá Federal University of Mato Grosso do Sul State University of Paraná State University of Western Paraná Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Rasbold, Giliane Gessica Stevaux, José Cândido Parolin, Mauro Leli, Isabel Teresinha Luz, Leandro Domingos Brito, Hermes Dias [UNESP] |
dc.subject.por.fl_str_mv |
Anabranching channel Facies analysis Fluvial environment Phytoliths Quaternary |
topic |
Anabranching channel Facies analysis Fluvial environment Phytoliths Quaternary |
description |
Phytolith analysis has become a useful tool for paleoenvironmental studies. Phytoliths are produced by plants and are composed of biogenic silica, giving them higher resistance to diagenetic and oxidation processes that commonly occur in tropical sediments. Here, we analyzed the preserved phytolith assemblages in a sedimentary core recovered from an island in the Upper Paraná River. Deposition and preservation of distinctive phytoliths of different vegetation types in the sedimentary facies have provided evidence of the formation of the fluvial island and the floral succession since the Late Pleistocene. Three distinctive phases were described in the island formation. The sandy base (Sr facies) of the core (240 cm) was dated to 14,620 cal yr BP. Most phytoliths in this phase were characteristic of the Podostemaceae family -- aquatic plants adapted to intense water flow. At 97 cm depth, organic sedimentary facies (Fm facies) were dated to 7382 cal yr BP. At this phase, the phytolith assemblage is composed mainly of parallelepipedal bulliform, cuneiform bulliform, and elongate psilate; such morphotypes are primarily produced by grasses. Towards the core top is a layer of massive fine sediments (Vm facies) with greater abundance of plant fragments. The assemblage is composed of short cells, predominantly the bilobate morphotype, which is characteristic of the Panicoideae subfamily (Poaceae) and indicative of soil humidity. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T01:14:35Z 2020-12-12T01:14:35Z 2020-04-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.jsames.2020.102513 Journal of South American Earth Sciences, v. 99. 0895-9811 http://hdl.handle.net/11449/198499 10.1016/j.jsames.2020.102513 2-s2.0-85079181566 |
url |
http://dx.doi.org/10.1016/j.jsames.2020.102513 http://hdl.handle.net/11449/198499 |
identifier_str_mv |
Journal of South American Earth Sciences, v. 99. 0895-9811 10.1016/j.jsames.2020.102513 2-s2.0-85079181566 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of South American Earth Sciences |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1803046019456303104 |