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dc.contributor.author
Arrouy, Maria Julia  
dc.contributor.author
Gaucher, Claudio  
dc.contributor.author
Poire, Daniel Gustavo  
dc.contributor.author
Xiao, Shuhai  
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Gómez Peral, Lucia  
dc.contributor.author
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  
dc.subject
LA PROVIDENCIA GROUP  
dc.subject
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  
dc.description.fil
Fil: Gaucher, Claudio. Universidad de la República; Uruguay  
dc.description.fil
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  
dc.description.fil
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  
dc.description.fil
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