Paleoecology of marine ostracods from the lower portion of the Corumbataí Formation (Permian of Paraná Basin), Goiás State, Brazil

Outcrops of the Corumbataí Formation (Passa Dois Group) in the northern sector of the Paraná Basin expose marine neritic rocks deposited under slightly limnic influence and represent storm events to some extent. Ostracod occurrences confirm the Kungurian age of these rocks. Other authors working wit...

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Detalles Bibliográficos
Autores principales:	Tomassi, Henrique Z., Carmo, Dermeval Aparecido do
Formato:	Objeto de conferencia
Lenguaje:	Inglés
Publicado:	2010
Materias:	Ciencias Naturales Paleontología
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/16980
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-16980
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Naturales Paleontología
spellingShingle	Ciencias Naturales Paleontología Tomassi, Henrique Z. Carmo, Dermeval Aparecido do Paleoecology of marine ostracods from the lower portion of the Corumbataí Formation (Permian of Paraná Basin), Goiás State, Brazil
topic_facet	Ciencias Naturales Paleontología
description	Outcrops of the Corumbataí Formation (Passa Dois Group) in the northern sector of the Paraná Basin expose marine neritic rocks deposited under slightly limnic influence and represent storm events to some extent. Ostracod occurrences confirm the Kungurian age of these rocks. Other authors working with samples from other portions of the basin could determine that the depositional system switched to shallow lakes in the Roadian. The studied material came from outcrops in southwestern Goiás State, in the northeast area of the Santa Rita do Araguaia Municipality. The eight ostracod species identified in the Corumbataí Formation belong to the families Bairdiocyprididae, Cytherideidae, Bairdiidae and Knoxitidae: Silenites sp. 1, Silenites? sp. 2, Basslerella sp. 1, Basslerella sp. 2, Saumella? sp. 1, Bairdiacypris sp. 1, Bairdiacypris sp. 2, Langdaia? sp. 1. With the exception of the Family Bairdiocyprididae, the other family group taxa have been reported exclusively from marine paleoenvironments. The ostracod assemblage is composed exclusively by neritic species that lived in a terrigenous substrate (muddy to sandy) in warm waters. Regarding salinity, all species are stenohaline, except Silenites sp. 1 and Silenites? sp. 2. Euhaline conditions may have occurred too. The presence of common Tethys genera, such as Silenites, Basslerella and Bairdiacypris corroborate the hypothesis of connections between the depositional system of the Corumbataí Formation and other marine coeval paleoenvironments. The low ecologic diversity of ostracod was probably due to restriction of the connection of this paleoenvironment with oceanic waters and the "restricted marine environment" is a more precise interpretation when compared with the "coastal lagoon" interpreted in previous works. This hypothesis is confirmed by the low abundance of Silenites species, the high abundance of which is indicative of coastal lagoon paleoenvironments. The frequent occurrence of ostracods in bioclastic lenses suggests a paleoenvironmental model of occasional storm events in the Corumbataí Formation.
format	Objeto de conferencia Objeto de conferencia
author	Tomassi, Henrique Z. Carmo, Dermeval Aparecido do
author_facet	Tomassi, Henrique Z. Carmo, Dermeval Aparecido do
author_sort	Tomassi, Henrique Z.
title	Paleoecology of marine ostracods from the lower portion of the Corumbataí Formation (Permian of Paraná Basin), Goiás State, Brazil
title_short	Paleoecology of marine ostracods from the lower portion of the Corumbataí Formation (Permian of Paraná Basin), Goiás State, Brazil
title_full	Paleoecology of marine ostracods from the lower portion of the Corumbataí Formation (Permian of Paraná Basin), Goiás State, Brazil
title_fullStr	Paleoecology of marine ostracods from the lower portion of the Corumbataí Formation (Permian of Paraná Basin), Goiás State, Brazil
title_full_unstemmed	Paleoecology of marine ostracods from the lower portion of the Corumbataí Formation (Permian of Paraná Basin), Goiás State, Brazil
title_sort	paleoecology of marine ostracods from the lower portion of the corumbataí formation (permian of paraná basin), goiás state, brazil
publishDate	2010
url	http://sedici.unlp.edu.ar/handle/10915/16980
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bdutipo_str	Repositorios
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Paleoecology of marine ostracods from the lower portion of the Corumbataí Formation (Permian of Paraná Basin), Goiás State, Brazil

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