Article (Périodiques scientifiques)
Glaciomarine sequence stratigraphy in the Mississippian Río Blanco Basin, Argentina, southwestern Gondwana. Basin analysis and palaeoclimatic implications for the Late Paleozoic Ice Age during the Tournaisian.
Ezpeleta, Miguel; Rustán, Juan José; Balseiro, Diego et al.
2020In Journal of the Geological Society, 177 (6), p. 1107 - 1128
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Mots-clés :
Age constraints; Argentina; Basin analysis; Geographics; Highstand systems tract; Late paleozoic ice age; Mississippians; Pennsylvanians; Sequence stratigraphy; Transgressive systems tracts; Geology
Résumé :
[en] The Late Paleozoic Ice Age (LPIA) has been well recorded in the uppermost Mississippian–Pennsylvanian of Gondwana. Nevertheless, little is known about the temporal and geographic dynamics, particularly during the early Mississippian. We report on exceptional Tournaisian glaciomarine stratigraphic sections from central Argentina (Río Blanco Basin). Encompassing c. 1400 m, these successions contain conspicuous glacigenic strata with age constraints provided by palaeontological data and U/Pb detrital zircon age spectra. A variety of marine, glaciomarine and fan-deltaic environments indicate relative sea-level variations mainly associated with tectonism and repetitive cycles of glacial activity. Provenance analysis indicates a source from the Sierras Pampeanas basement located to the east. Fifteen sequences were grouped into three depositional models: (1) Transgressive Systems Tracts (TST) to Highstand Systems Tracts (HST) sequences unaffected by glacial ice; (2) Lowstand Systems Tracts (LST) to TST and then to HST with glacial influence; and (3) non-glacial Falling-Stage Systems Tracts (FSST) to TST and HST. The glacial evidence indicates that the oldest Mississippian glacial stage of the LPIA in southwestern Gondwana is constrained to the middle Tournaisian. In contrast with previous descriptions of Gondwanan coeval glacial records, our sequence analysis confirms complex hierarchical climate variability, rather than a single episode of ice advance and retreat.
Disciplines :
Sciences de la terre & géographie physique
Auteur, co-auteur :
Ezpeleta, Miguel ;  CICTERRA-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina ; Universidad Nacional de La Rioja, La Rioja, Argentina
Rustán, Juan José;  CICTERRA-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina ; Universidad Nacional de La Rioja, La Rioja, Argentina
Balseiro, Diego ;  CICTERRA-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
Dávila, Federico Miguel;  CICTERRA-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
Dahlquist, Juan Andrés;  CICTERRA-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
Vaccari, Norberto Emilio;  CICTERRA-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina ; Universidad Nacional de La Rioja, La Rioja, Argentina
Sterren, Andrea Fabiana;  CICTERRA-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
Prestianni, Cyrille  ;  Université de Liège - ULiège > Département de géologie > Evolution and diversity dynamics lab ; Palaeontology Department, Royal Belgian Institute of Natural Sciences, Brussels, Belgium
Cisterna, Gabriela Adriana;  CICTERRA-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina ; Universidad Nacional de La Rioja, La Rioja, Argentina
Basei, Miguel ;  Instituto de Geociências, Universidade de São Paulo, São Paulo, Brazil
Langue du document :
Anglais
Titre :
Glaciomarine sequence stratigraphy in the Mississippian Río Blanco Basin, Argentina, southwestern Gondwana. Basin analysis and palaeoclimatic implications for the Late Paleozoic Ice Age during the Tournaisian.
Date de publication/diffusion :
novembre 2020
Titre du périodique :
Journal of the Geological Society
ISSN :
0016-7649
Maison d'édition :
Geological Society of London
Volume/Tome :
177
Fascicule/Saison :
6
Pagination :
1107 - 1128
Peer reviewed :
Peer reviewed vérifié par ORBi
Organisme subsidiant :
UNLAR - Universidad Nacional de La Rioja
ANPCyT - Agencia Nacional de Promoción Científica y Tecnológica
Subventionnement (détails) :
Acknowledgements D. Murua, D. Muñoz, E. Sferco, M. Salas, F. Degrange, H. Canelo and F. Meroi kindly collaborated with the authors during field work. Lodging during field days was provided by the building company Benito Roggio S.A. This study was possible thanks to financial support from CONICET and ANPCyT (Agencia Nacional de Promoción Científica y Tecnológica) through FONCyT PICT-2015-3146, Secyt-UNLaR 2015-10732 and 2015-0422 granted to Miguel Ezpeleta; Secyt-UNLaR 2017-6993 granted to Juan José Rustán and Emilio Vaccari; FONCyT PICT 2016 0843, PIP0178 CONICET and P-UE N° 22920160100016 granted to CICTERRA; and an internship for J.A. Dahlquist in the Geosciences Institute of the Sao Paulo University supported by grant FAPESP 2018/06837-3.Funding This work was funded by the Fondo para la Investigación Científica y Tecnológica (2015/3146), Secretaria de Ciencia y Tecnica, Universidad Nacional de La Rioja (2015-10732), Secretaria de Ciencia y Tecnica, Universidad Nacional de La Rioja (2015-0422), Secretaria de Ciencia y Tecnica, Universidad Nacional de La Rioja (2017-6993), Fondo para la Investigación Científica y Tecnológica (2016 0843) and Fundação de Amparo à Pesquisa do Estado de São Paulo (2018/06837-3).
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depuis le 07 octobre 2022

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