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dc.contributor.author
Arrouy, Maria Julia
dc.contributor.author
Gaucher, Claudio
dc.contributor.author
Poire, Daniel Gustavo
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Xiao, Shuhai
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Gómez Peral, Lucia
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Warren, Lucas V.
dc.contributor.author
Bykova, Natalia
dc.contributor.author
Quaglio, Fernanda
dc.date.available
2020-01-08T20:32:45Z
dc.date.issued
2019-08
dc.identifier.citation
Arrouy, Maria Julia; Gaucher, Claudio; Poire, Daniel Gustavo; Xiao, Shuhai; Gómez Peral, Lucia; et al.; A new record of late Ediacaran acritarchs from La providencia group (Tandilia System, Argentina) and its biostratigraphical significance; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 93; 8-2019; 283-293
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/94017
dc.description.abstract
A well preserved assemblage of organic-walled microfossils is described from the Alicia and Cerro Negro formations of the La Providencia Group. The microbiota is dominated by Leiosphaeridia species (L. minutissima, L. tenuissima, L. crassa and L. jacutica) and comprises colonial sphaeroids (Synsphaeridium sp.) and filamentous microfossils of the genus Siphonophycus. The assemblage is assigned to the Late Ediacaran Leiosphere Palynoflora (LELP), which is consistent with the occurrence of the discoidal fossil Aspidella (<565 Ma) in the overlying unit. The distribution of microfossils within the Alicia Formation is mainly controlled by the shallowing upward trend and thus, environmental factors. This is indicated by the abundance and size of filaments, which tend to occur near to the paleoshore in shallow water settings. Furthermore, large leiospheres also occur in shallower facies together with filaments, in accordance with existing models for acritarch ecology and distribution in the Proterozoic marine successions. The absence of acanthomorphic acritarchs is thus interpreted as a real evolutionary trend, and not as a result of preservational or environmental biases. Regarding the preservation of microfossils, a higher Thermal Alteration Index for the Alicia Formation, compared with older and younger units, is interpreted as a result of hydrothermal overprint and/or contact metamorphism by basic dikes.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ACRITARCHS
dc.subject
EDIACARAN
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LA PROVIDENCIA GROUP
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TANDILIA SYSTEM
dc.subject.classification
Geociencias multidisciplinaria
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
A new record of late Ediacaran acritarchs from La providencia group (Tandilia System, Argentina) and its biostratigraphical significance
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-12-11T18:52:50Z
dc.journal.volume
93
dc.journal.pagination
283-293
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Arrouy, Maria Julia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
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Fil: Gaucher, Claudio. Universidad de la República; Uruguay
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Fil: Poire, Daniel Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
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Fil: Xiao, Shuhai. Virginia Tech University; Estados Unidos
dc.description.fil
Fil: Gómez Peral, Lucia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.description.fil
Fil: Warren, Lucas V.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
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Fil: Bykova, Natalia. Trofimuk Institute Of Petroleum Geology And Geophysics Of Siberian Branch Of Russian Academy Of Sciences;
dc.description.fil
Fil: Quaglio, Fernanda. Universidade de Sao Paulo; Brasil
dc.journal.title
Journal of South American Earth Sciences
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981119300902
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2019.05.015


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