气候变化领域集成服务门户(CCPortal): Timing of the Late Palaeozoic glaciation in western Gondwana: New ages and correlations from Paganzo and Paraná basins

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DOI	10.1016/j.palaeo.2020.109624
	Timing of the Late Palaeozoic glaciation in western Gondwana: New ages and correlations from Paganzo and Paraná basins
	Valdez Buso V.; Milana J.P.; di Pasquo M.; Paim P.S.G.; Philipp R.P.; Aquino C.D.; Cagliari J.; Junior F.C.; Kneller B.
发表日期	2020
ISSN	0031-0182
卷号	544
英文摘要	During the Late Palaeozoic, the Gondwana supercontinent formed an extensive Southern Hemisphere landmass that was affected by multiple glacial episodes, known collectively as the Late Palaeozoic Ice Age (LPIA). This resulted in the deposition of glacial, periglacial and deglacial sediments over much of the supercontinent. The Mississippian to early Pennsylvanian phase of glaciation is widely represented along the western margin of Gondwana. This constitutes one of the largest glaciations of the Phanerozoic in terms of its recorded extent and the widespread erosional hiatus it produced in the stratigraphic record. It was this mid Carboniferous glaciation, recorded in the Paganzo Basin of NW Argentina, that carved most of the paleovalleys and paleofjords present there. We report new U-Pb zircon ages from a single glacial succession (Guandacol Formation) of 326 ± 3 Ma and 320 ± 5 Ma, that in comparison with neighbouring dated sequences allow for the first time a reliable estimate of the timing and duration of glacial cycles. Palynological studies of these glacial-deglacial events yielded palynoassemblages of the MQ (Late Visean) and DMa (Sepukhovian-Bashkirian) Palynozones. The Carboniferous glacially-related strata and glacial cycles of the Paganzo Basin are compared here with equivalent units of the Paraná Basin of SE Brazil, suggesting a similar climate record for most of western Gondwana. We propose a new correlation between these two basins. The new U-Pb zircon ages reported here indicate that a regional glacial peak occurred almost coincident with the Mississippian-Pennsylvanian boundary, suggesting that the ensuing postglacial transgression is the best regional marker to differentiate the Mississippian and Pennsylvanian as it forms an identifiable interbasinal horizon. The biostratigraphic and chronostratigraphic comparison with other LPIA successions from South America reinforces that the First Appearance Datum of monosaccate pollen grains occurs in the late Serpukhovian. Their correlation confirms that similar climate conditions prevailed across most of western Gondwana during this phase of the LPIA. © 2020
英文关键词	Late Palaeozoic Ice Age; Paganzo Basin; Palynology; Paraná Basin; U-Pb zircon geochronology
语种	英语
scopus关键词	Carboniferous; climate conditions; correlation; dating method; glaciation; Gondwana; hiatus; Mississippian; Paleozoic; palynology; Pennsylvanian; Phanerozoic; Pleistocene; pollen; Southern Hemisphere; supercontinent; transgression; Argentina; Brazil; Paganzo Basin; Parana [Brazil]
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150574
作者单位	School of Geosciences, University of Aberdeen, Aberdeen, Scotland AB24 3UE, United Kingdom; CONICET, Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de San Juan, Av. Ignacio de la Roza 590 (O), San Juan, CP 5400, Argentina; Laboratorio de Palinoestratigrafía y Paleobotánica, CICYTTP-CONICET-ER-UADER, Dr. Materi y España S/N, Diamante, Entre Ríos E3105BWA, Argentina; Programa de Pós-Graduação, Universidade do Vale do Rio dos Sinos, Av. Unisinos, 950, São Leopoldo, RS CEP 93022-000, Brazil; Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, RS CEP 91509-900, Brazil; UFPR - Universidade Federal do Paraná, Departamento de Geologia, Av. Cel. Francisco H. dos Santos, 210 - Jardim das Américas, Curitiba, PR, Brazil
推荐引用方式 GB/T 7714	Valdez Buso V.,Milana J.P.,di Pasquo M.,et al. Timing of the Late Palaeozoic glaciation in western Gondwana: New ages and correlations from Paganzo and Paraná basins[J],2020,544.
APA	Valdez Buso V..,Milana J.P..,di Pasquo M..,Paim P.S.G..,Philipp R.P..,...&Kneller B..(2020).Timing of the Late Palaeozoic glaciation in western Gondwana: New ages and correlations from Paganzo and Paraná basins.Palaeogeography, Palaeoclimatology, Palaeoecology,544.
MLA	Valdez Buso V.,et al."Timing of the Late Palaeozoic glaciation in western Gondwana: New ages and correlations from Paganzo and Paraná basins".Palaeogeography, Palaeoclimatology, Palaeoecology 544(2020).