IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Glaciation During the Late Paleozoic Ice Age
Autor/es:
PAULS, KATHRYN N.; MOXNESS, LEVI D.; MONTAÑEZ, I.P.; BIAKOV, A.S.; TABOADA, A.C.; SCHENCMAN, L.J.; VEDERNIKOV, I.L.; FEDORCHUK, N.D.; IVES, L.R.W.; VESELY, F.F.; IANNUZZI, R.; MUNDIL, R.; CICCIOLI, P.; DAVYDOV, V.I.; ISBELL, JOHN L.; GRIFFIS, N.P.; SURVIS, S.R.; LIMARINO, C.O.; DA ROSA, E.L.M.; PAGANI, M.A.; ALONSO MURUAGA, PABLO JOAQUÍN; MCNALL, N.B.
Lugar:
Esquel
Reunión:
Simposio; VII SIMPOSIO ARGENTINO DEL PALEOZOICO SUPERIOR; 2018
Institución organizadora:
CENTRO DE INVESTIGACIÓN ESQUEL DE MONTAÑA Y ESTEPA PATAGONICA (CIEMEP)
Resumen:
The Late Paleozoic Ice Age (LPIA) was one of Earth?s most extreme climatic events wheresea level and biotic restructuring were driven by linked oscillations in the climate system.Despite an evolving understanding of the ice age, the size, distribution, paleogeography, timing,depositional settings, and possible bipolarity of the glaciation remains unresolved. However,new and refined radioisotopic age dates are revising the timing and extent of individual stagesof the ice age. Recent studies suggest numerous, ice centers fluctuated diachronously asglaciation shifted across Gondwana. The LPIA began in the Famennian in northern SouthAmerica and Africa and ended in eastern Australia during the Wuchiapingian. Althoughglaciation was widespread, numerous ice-free areas occurred adjacent to major glacial centers.Deglaciation was also diachronous beginning in the Bashkirian in western Argentina, shifting tothe Paraná Basin by the end of the Pennsylvanian, with deglaciation of the South Polar Regionoccurring during the late Early Permian. Deglaciation culminated in eastern Australia with thedisappearance of high, mid-latitude, alpine glaciers during the Wuchiapingian at a time whenPolar Gondwana was ice-free. Recent work on diamictites in northeastern Russia indicates thatthese strata were not glacigenic but instead were deposited as volcanic debris flows andslides/slumps associated with concurrent activity in the Okhotsk-Taigonos volcanic arc.Therefore, bipolar glaciation cannot be confirmed. Although fluctuations in greenhouse gaseswere a major driver of climate, paleogeography, tectonism, and other minor drivers also playeda role in the nucleation and disappearance of LPIA glaciers.