Paleoenvironmental interpretation of the Mandiyuti group (Upper Carboniferous), Salta Province, Argentina. Palynologic, sedimentologic and taphonomic evidences

In the Argentine region of Tarija Basin, the Mandiyuti Group includes two units: Escarpment and San Telmo Formations. The stratigraphic section, around 700 meters thick, is located at the surroundings of Carapari River, Salta province. The paleomicrofloral study was made with samples from a section...

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Detalles Bibliográficos
Autores principales: Di Pasquo, M., Azcuy, C.L.
Formato: JOUR
Materias:
Argentina
Mandiyuti Group
Paleoenvironmental interpretation
Palynofloral paleocommunities
Salta
Taphonomy
Carboniferous
paleoecology
paleoenvironment
palynology
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00027014_v36_n4_p453_DiPasquo
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00027014_v36_n4_p453_DiPasquo2023-10-03T13:52:43Z Paleoenvironmental interpretation of the Mandiyuti group (Upper Carboniferous), Salta Province, Argentina. Palynologic, sedimentologic and taphonomic evidences Di Pasquo, M. Azcuy, C.L. Argentina Mandiyuti Group Paleoenvironmental interpretation Palynofloral paleocommunities Salta Taphonomy Carboniferous paleoecology paleoenvironment palynology Argentina In the Argentine region of Tarija Basin, the Mandiyuti Group includes two units: Escarpment and San Telmo Formations. The stratigraphic section, around 700 meters thick, is located at the surroundings of Carapari River, Salta province. The paleomicrofloral study was made with samples from a section of 100 m thick at the boundary between these units. The recognition of more than one hundred of miospore species with their botanical affinities has allowed to reconstruct five paleofloral communities, each one with particular hydrophytic requirements. They have been defined as Paleocommunity A (lycophytes-sphenophytes), Paleocommunity B (filicophytes), Paleocommunity C (mainly monosaccate pollen grains), Paleocommunity D (poliplicate pollen grains), Paleocommunity E (Botryococcus and other probable algae). Based on palynological, taphonomic and sedimentologic analyses from the studied section continental conditions are inferred. A trend of evolution for the depocentre, starting with a lacustrine system under humid conditions that ends with a drier alluvial plain, has been established. This paleoclimatic change is suggested by the appearance of the Paleocommunity D with Equisetosporites in the sample M445 of the middle section. It is also observed a change in the sediment color from grey in the lower and middle sections to red in the upper palynologically barren section. Finally, the observed transitional paleoclimatic evolution in this area of the Tarija Basin for the Carboniferous / Permian boundary is correlated with the same transitional change in other Argentine basins from this period. Fil:Azcuy, C.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00027014_v36_n4_p453_DiPasquo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Mandiyuti Group
Paleoenvironmental interpretation
Palynofloral paleocommunities
Salta
Taphonomy
Carboniferous
paleoecology
paleoenvironment
palynology
Argentina
spellingShingle Argentina
Mandiyuti Group
Paleoenvironmental interpretation
Palynofloral paleocommunities
Salta
Taphonomy
Carboniferous
paleoecology
paleoenvironment
palynology
Argentina
Di Pasquo, M.
Azcuy, C.L.
Paleoenvironmental interpretation of the Mandiyuti group (Upper Carboniferous), Salta Province, Argentina. Palynologic, sedimentologic and taphonomic evidences
topic_facet Argentina
Mandiyuti Group
Paleoenvironmental interpretation
Palynofloral paleocommunities
Salta
Taphonomy
Carboniferous
paleoecology
paleoenvironment
palynology
Argentina
description In the Argentine region of Tarija Basin, the Mandiyuti Group includes two units: Escarpment and San Telmo Formations. The stratigraphic section, around 700 meters thick, is located at the surroundings of Carapari River, Salta province. The paleomicrofloral study was made with samples from a section of 100 m thick at the boundary between these units. The recognition of more than one hundred of miospore species with their botanical affinities has allowed to reconstruct five paleofloral communities, each one with particular hydrophytic requirements. They have been defined as Paleocommunity A (lycophytes-sphenophytes), Paleocommunity B (filicophytes), Paleocommunity C (mainly monosaccate pollen grains), Paleocommunity D (poliplicate pollen grains), Paleocommunity E (Botryococcus and other probable algae). Based on palynological, taphonomic and sedimentologic analyses from the studied section continental conditions are inferred. A trend of evolution for the depocentre, starting with a lacustrine system under humid conditions that ends with a drier alluvial plain, has been established. This paleoclimatic change is suggested by the appearance of the Paleocommunity D with Equisetosporites in the sample M445 of the middle section. It is also observed a change in the sediment color from grey in the lower and middle sections to red in the upper palynologically barren section. Finally, the observed transitional paleoclimatic evolution in this area of the Tarija Basin for the Carboniferous / Permian boundary is correlated with the same transitional change in other Argentine basins from this period.
format JOUR
author Di Pasquo, M.
Azcuy, C.L.
author_facet Di Pasquo, M.
Azcuy, C.L.
author_sort Di Pasquo, M.
title Paleoenvironmental interpretation of the Mandiyuti group (Upper Carboniferous), Salta Province, Argentina. Palynologic, sedimentologic and taphonomic evidences
title_short Paleoenvironmental interpretation of the Mandiyuti group (Upper Carboniferous), Salta Province, Argentina. Palynologic, sedimentologic and taphonomic evidences
title_full Paleoenvironmental interpretation of the Mandiyuti group (Upper Carboniferous), Salta Province, Argentina. Palynologic, sedimentologic and taphonomic evidences
title_fullStr Paleoenvironmental interpretation of the Mandiyuti group (Upper Carboniferous), Salta Province, Argentina. Palynologic, sedimentologic and taphonomic evidences
title_full_unstemmed Paleoenvironmental interpretation of the Mandiyuti group (Upper Carboniferous), Salta Province, Argentina. Palynologic, sedimentologic and taphonomic evidences
title_sort paleoenvironmental interpretation of the mandiyuti group (upper carboniferous), salta province, argentina. palynologic, sedimentologic and taphonomic evidences
url http://hdl.handle.net/20.500.12110/paper_00027014_v36_n4_p453_DiPasquo
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AT azcuycl paleoenvironmentalinterpretationofthemandiyutigroupuppercarboniferoussaltaprovinceargentinapalynologicsedimentologicandtaphonomicevidences
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