Artículo
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
; Davila, Federico Miguel
; Dahlquist, Juan Andrés
; Vaccari, Norberto Emilio
; Sterren, Andrea Fabiana
; Prestianni, Cyrille; Cisterna, Gabriela Adriana
; Basei, Miguel
Fecha de publicación:
07/2020
Editorial:
Geological Society Publications House
Revista:
Journal of the Geological Society
ISSN:
0016-7649
e-ISSN:
2041-479X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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 bypalaeontological 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 threedepositional 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.
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Articulos(CICTERRA)
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Ezpeleta, Miguel; Rustán, Juan José; Balseiro, Diego; Davila, Federico Miguel; Dahlquist, Juan Andrés; et al.; 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; Geological Society Publications House; Journal of the Geological Society; 177; 6; 7-2020; 1107-1128
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