Review and comparison of some Jurassic continental palynobiotas of western and southern Argentina

Autores
Volkheimer, W.; Narváez, P.; Cabaleri, N.; Scafati, L.; Armella, C.; Melendi, D. L.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Palynologic assemblages from Middle and Upper Jurassic sediments of the Cañadón Asfalto Basin (central Chubut) and the Neuquén Basin are compared. The following localities are considered: Cañadón Lahuincó and Estancia Fossati (Chubut); Charahuilla, Arroyo Picún Leufú, and Portada Covunco (Neuquén). Palynostratigraphic and statistic studies show tendencies in diversity at species level and in suprageneric groups. Topographically elevated hinterlands with prevailing conifer vegetation (Araucariaceae and/or Podocarpaceae) can be inferred for the Jurassic. A very high representation of the thermophilous Cheirolepidiacean Classopollis pollen indicates warm, arid to semiarid climatic conditions in Chubut. A high representation of trilete spores suggests local humid conditions (deltaic swamps) in the studied Middle Jurassic areas of the Neuquén Basin, within a general semiarid climatic context. Low specific palynologic diversity in the lowermost part of the Cañadón Asfalto Formation (early Middle Jurassic) could be explained by the high frequency and intensity of the volcanic activity. In order to understand the regional paleoclimatic context, it is necessary to look northwards and southwards of the studied area. During the Late Jurassic, extremely arid conditions are indicated for nearly the whole extension of the Chaco-Paraná Basin and the Paraná Basin, which are the scenario of the largest paleodesert known so far from the geologic record worldwide ("Botucatú-paleodesert"). Along the Pacific coast, the paleoclimatic picture of an extremely arid region, at the same paleolatitudes mentioned, was completed by extensive Late Jurassic (Oxfordian) deposits of evaporites (anhydrite, gypsum), extending from Zapala (Neuquén Province) to the San Juan Province and continuing to southern Perú. Southwards of the studied area, in the Santa Cruz Province, previous records of arborescent ferns and coal deposits in the Middle to Late Jurassic La Matilde Formation suggest, at least locally, moist conditions.
Sesiones libres
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Paleontología
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/16993

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spelling Review and comparison of some Jurassic continental palynobiotas of western and southern ArgentinaVolkheimer, W.Narváez, P.Cabaleri, N.Scafati, L.Armella, C.Melendi, D. L.Ciencias NaturalesPaleontologíaPalynologic assemblages from Middle and Upper Jurassic sediments of the Cañadón Asfalto Basin (central Chubut) and the Neuquén Basin are compared. The following localities are considered: Cañadón Lahuincó and Estancia Fossati (Chubut); Charahuilla, Arroyo Picún Leufú, and Portada Covunco (Neuquén). Palynostratigraphic and statistic studies show tendencies in diversity at species level and in suprageneric groups. Topographically elevated hinterlands with prevailing conifer vegetation (Araucariaceae and/or Podocarpaceae) can be inferred for the Jurassic. A very high representation of the thermophilous Cheirolepidiacean Classopollis pollen indicates warm, arid to semiarid climatic conditions in Chubut. A high representation of trilete spores suggests local humid conditions (deltaic swamps) in the studied Middle Jurassic areas of the Neuquén Basin, within a general semiarid climatic context. Low specific palynologic diversity in the lowermost part of the Cañadón Asfalto Formation (early Middle Jurassic) could be explained by the high frequency and intensity of the volcanic activity. In order to understand the regional paleoclimatic context, it is necessary to look northwards and southwards of the studied area. During the Late Jurassic, extremely arid conditions are indicated for nearly the whole extension of the Chaco-Paraná Basin and the Paraná Basin, which are the scenario of the largest paleodesert known so far from the geologic record worldwide ("Botucatú-paleodesert"). Along the Pacific coast, the paleoclimatic picture of an extremely arid region, at the same paleolatitudes mentioned, was completed by extensive Late Jurassic (Oxfordian) deposits of evaporites (anhydrite, gypsum), extending from Zapala (Neuquén Province) to the San Juan Province and continuing to southern Perú. Southwards of the studied area, in the Santa Cruz Province, previous records of arborescent ferns and coal deposits in the Middle to Late Jurassic La Matilde Formation suggest, at least locally, moist conditions.Sesiones libresFacultad de Ciencias Naturales y Museo2010info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/16993enginfo:eu-repo/semantics/altIdentifier/isbn/978-987-95849-7-2info:eu-repo/semantics/reference/url/https://sedici.unlp.edu.ar/handle/10915/25738info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T10:53:07Zoai:sedici.unlp.edu.ar:10915/16993Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 10:53:07.902SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Review and comparison of some Jurassic continental palynobiotas of western and southern Argentina
title Review and comparison of some Jurassic continental palynobiotas of western and southern Argentina
spellingShingle Review and comparison of some Jurassic continental palynobiotas of western and southern Argentina
Volkheimer, W.
Ciencias Naturales
Paleontología
title_short Review and comparison of some Jurassic continental palynobiotas of western and southern Argentina
title_full Review and comparison of some Jurassic continental palynobiotas of western and southern Argentina
title_fullStr Review and comparison of some Jurassic continental palynobiotas of western and southern Argentina
title_full_unstemmed Review and comparison of some Jurassic continental palynobiotas of western and southern Argentina
title_sort Review and comparison of some Jurassic continental palynobiotas of western and southern Argentina
dc.creator.none.fl_str_mv Volkheimer, W.
Narváez, P.
Cabaleri, N.
Scafati, L.
Armella, C.
Melendi, D. L.
author Volkheimer, W.
author_facet Volkheimer, W.
Narváez, P.
Cabaleri, N.
Scafati, L.
Armella, C.
Melendi, D. L.
author_role author
author2 Narváez, P.
Cabaleri, N.
Scafati, L.
Armella, C.
Melendi, D. L.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Naturales
Paleontología
topic Ciencias Naturales
Paleontología
dc.description.none.fl_txt_mv Palynologic assemblages from Middle and Upper Jurassic sediments of the Cañadón Asfalto Basin (central Chubut) and the Neuquén Basin are compared. The following localities are considered: Cañadón Lahuincó and Estancia Fossati (Chubut); Charahuilla, Arroyo Picún Leufú, and Portada Covunco (Neuquén). Palynostratigraphic and statistic studies show tendencies in diversity at species level and in suprageneric groups. Topographically elevated hinterlands with prevailing conifer vegetation (Araucariaceae and/or Podocarpaceae) can be inferred for the Jurassic. A very high representation of the thermophilous Cheirolepidiacean Classopollis pollen indicates warm, arid to semiarid climatic conditions in Chubut. A high representation of trilete spores suggests local humid conditions (deltaic swamps) in the studied Middle Jurassic areas of the Neuquén Basin, within a general semiarid climatic context. Low specific palynologic diversity in the lowermost part of the Cañadón Asfalto Formation (early Middle Jurassic) could be explained by the high frequency and intensity of the volcanic activity. In order to understand the regional paleoclimatic context, it is necessary to look northwards and southwards of the studied area. During the Late Jurassic, extremely arid conditions are indicated for nearly the whole extension of the Chaco-Paraná Basin and the Paraná Basin, which are the scenario of the largest paleodesert known so far from the geologic record worldwide ("Botucatú-paleodesert"). Along the Pacific coast, the paleoclimatic picture of an extremely arid region, at the same paleolatitudes mentioned, was completed by extensive Late Jurassic (Oxfordian) deposits of evaporites (anhydrite, gypsum), extending from Zapala (Neuquén Province) to the San Juan Province and continuing to southern Perú. Southwards of the studied area, in the Santa Cruz Province, previous records of arborescent ferns and coal deposits in the Middle to Late Jurassic La Matilde Formation suggest, at least locally, moist conditions.
Sesiones libres
Facultad de Ciencias Naturales y Museo
description Palynologic assemblages from Middle and Upper Jurassic sediments of the Cañadón Asfalto Basin (central Chubut) and the Neuquén Basin are compared. The following localities are considered: Cañadón Lahuincó and Estancia Fossati (Chubut); Charahuilla, Arroyo Picún Leufú, and Portada Covunco (Neuquén). Palynostratigraphic and statistic studies show tendencies in diversity at species level and in suprageneric groups. Topographically elevated hinterlands with prevailing conifer vegetation (Araucariaceae and/or Podocarpaceae) can be inferred for the Jurassic. A very high representation of the thermophilous Cheirolepidiacean Classopollis pollen indicates warm, arid to semiarid climatic conditions in Chubut. A high representation of trilete spores suggests local humid conditions (deltaic swamps) in the studied Middle Jurassic areas of the Neuquén Basin, within a general semiarid climatic context. Low specific palynologic diversity in the lowermost part of the Cañadón Asfalto Formation (early Middle Jurassic) could be explained by the high frequency and intensity of the volcanic activity. In order to understand the regional paleoclimatic context, it is necessary to look northwards and southwards of the studied area. During the Late Jurassic, extremely arid conditions are indicated for nearly the whole extension of the Chaco-Paraná Basin and the Paraná Basin, which are the scenario of the largest paleodesert known so far from the geologic record worldwide ("Botucatú-paleodesert"). Along the Pacific coast, the paleoclimatic picture of an extremely arid region, at the same paleolatitudes mentioned, was completed by extensive Late Jurassic (Oxfordian) deposits of evaporites (anhydrite, gypsum), extending from Zapala (Neuquén Province) to the San Juan Province and continuing to southern Perú. Southwards of the studied area, in the Santa Cruz Province, previous records of arborescent ferns and coal deposits in the Middle to Late Jurassic La Matilde Formation suggest, at least locally, moist conditions.
publishDate 2010
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