Facies and depositional architecture according to a jet efflux model of a late Paleozoic tidewater grounding-line system from the Itararé Group (Paraná Basin), southern Brazil

Aquino, Carolina Danielski; Buso, Victoria Valdez; Faccini, Ubiratan Ferrucio; Milana, Juan Pablo; Paim, Paulo Sérgio Gomes

doi:10.1016/j.jsames.2016.02.008

Cited by 39 publications

(37 citation statements)

References 49 publications

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“…This package mostly records proglacial-marine deposition including ice-rafted debris (IRD); varve-like, finegrained rhythmites; massive and varve-like black shales; thin-bedded and sandy turbidites; subaqueous outwash fan facies; and chaotic deposits derived from debris-and massflows. According to Aquino et al (2016), the Itararé Group in this area can be subdivided into three depositional sequences, each one composed of glacially influenced, marine to delta deposits, and is unconformably overlain by the post-glacial Rio Bonito Formation. Each depositional sequence represents a glacial subcycle (S1, S2, and S3) recorded by deglacial facies deposited during ice retreat (Deglacial Systems Tract or DST) above a sequence boundary (SB).…”

Section: Doutor Pedrinho Areamentioning

confidence: 99%

“…Each depositional sequence represents a glacial subcycle (S1, S2, and S3) recorded by deglacial facies deposited during ice retreat (Deglacial Systems Tract or DST) above a sequence boundary (SB). These basal surfaces are characterized by deformational or scour features related to glacial advance (Aquino et al, 2016) and/or abrupt shift of facies caused by a relative sea level drop associated with a less expressive glacial advance (d 'Ávila, 2009;Fallgatter, 2015).…”

Section: Doutor Pedrinho Areamentioning

confidence: 99%

“…In South America, the LPIA is reported from several basins, but the largest one recording such glacial evidence is the intracratonic Paraná Basin. According to several authors, in this basin the LPIA is recorded in the Itararé Group, which comprises widespread proglacial and rare subglacial deposits (Rocha-Campos 1967;Schneider et al, 1974;Milani, 1997;Milani et al, 2007;Rocha-Campos et al, 2008;d´Avila, 2009;Vesely et al, 2015;Aquino et al, 2016;Fallgatter and Paim, 2017). Most of the existing studies of the LPIA in South America indicate an important difference in deposition of glacial deposits between the west and the east: whereas in the western side, glacial strata range from Mississippian to Pennsylvanian, based on both palynology and radiometric dating (Gulbranson et al, 2010, Césari et al, 2011, in Brazil glacial and proglacial beds have systematically been ascribed from Pennsylvanian to Early Cisuralian, but only based on palynological and other palaeontological data (Holz et al, 2008, Neves et al, 2014Taboada et al, 2016).…”

Section: Introductionmentioning

confidence: 98%

“…d´Avila, 2009; Aquino et al, 2016) and sandy turbidite systems (e.g. d 'Ávila, 2009;Fallgatter, 2015) that can be traced for tens of km (Fallgatter, 2015), as well as thin-bedded sandstones, remobilized intervals, marine mudstones and black shales, all of them quite often including dropstones.…”

Section: Introductionmentioning

confidence: 99%

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Late Palaeozoic glacial cycles and subcycles in western Gondwana: Correlation of surface and subsurface data of the Paraná Basin, Brazil

Buso

Aquino

Paim

et al. 2019

Palaeogeography, Palaeoclimatology, Palaeoecology

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The Paraná Basin, the largest basin in South America, received glacially derived sediments during the Late Palaeozoic Ice Age (LPIA) of the Gondwana supercontinent.Despite the importance of this basin for understanding the continental development of the Gondwana glaciation, and the fact that ca. 95% of this basin is not exposed at the surface, few attempts have been made to connect the exposed glacial strata to the subsurface record. In this paper, exposures of glacial cycles in the Upper Itararé Group in Santa Catarina State, southern Brazil, are analyzed, locally correlated and then linked to the three major glacial cycles previously described from subsurface studies along the basin. Together study areas (Doutor Pedrinho and Vidal Ramos) record five, partially comparable shorter glacial subcycles (relative to the major glacial cycles). These series comprise coarse-grained subaqueous outwash deposits, turbidite sand sheets, marine shales, and diamictites, the latter mostly derived from delta slope failure and ensuing resedimentation. In addition to sedimentological and genetic stratigraphic description and analysis, preliminary age determination based on the palynological content is also presented. Besides, a regional correlation of the described succession to the subsurface record is proposed based on well logs and core information. All the palynomorph associations identified from the exposed successions, which represent the upper third part of the Itararé Group, are related to the Subzone Protohaploxypinus goraiensis, base of the Vittatina costabilis Zone. This zone and correlated ones along the Gondwana are considered Early Permian in age. However, a first isotopic age recently obtained for the upper Itararé Group and published elsewhere is considered within a regional stratigraphic framework once it leads to new insights in terms of the LPIA time span recorded in the Paraná Basin.

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Section: Doutor Pedrinho Areamentioning

confidence: 99%

Section: Doutor Pedrinho Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Late Palaeozoic glacial cycles and subcycles in western Gondwana: Correlation of surface and subsurface data of the Paraná Basin, Brazil

Buso

Aquino

Paim

et al. 2019

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…van der Wateren 1994, Roberts & Hart 2005), including folds, faults, boudins and foliation. These structures can also be used to give ice-flow kinematics and are documented in the late Paleozoic succession in Paraná Basin (Vesely et al 2015, Aquino et al 2016, however they are not discussed in the present paper. In glacial marine or lacustrine environments blocks of floating ice (icebergs or sea/lake ice) may scour the bottom sediments producing ice-keel scour marks that are shallow to deep scours containing parallel sets of grooves and ridges (e.g.…”

Section: Micro To Mesoscale Ice-related Erosional Landformsmentioning

confidence: 99%

A review on late Paleozoic ice-related erosional landforms in the Paraná Basin: origin and paleogeographical implications

2016

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ABSTRACT:The Late Paleozoic Ice Age is recorded in the Paraná Basin as glacial deposits, deformational features and ice-related erosional landforms of the Itararé Group. Erosional landforms are often employed to build paleogeographic models that depict the location of ice masses and paleo ice-flow directions. This paper provides a review of the literature and new data on micro-to meso-scale ice-related, erosional landforms of the Paraná Basin. Examined landforms can be placed into four broad categories based on their mode of origin. Subglacial landforms on rigid substrates occur on the Precambrian basement or on older units in the Paraná Basin. They include streamlined landforms and striated pavements formed by abrasion and/or plucking beneath advancing glaciers. Subglacial landforms on soft beds are intraformational surfaces generated by erosion and deformation of unconsolidated deposits when overridden by glaciers. Ice-keel scour marks are soft-sediment striated/grooved landforms developed by the scouring of free-floating ice masses on underlying sediments. Striated clast pavements are horizons containing aligned clasts that are abraded subglacially due to the advance of glaciers on unconsolidated deposits. Only those erosional landforms formed subglacially can be used as reliable paleo ice-flow indicators. Based on these data, the paleogeography of the Paraná Basin during the Late Paleozoic Ice Age fits into a model of several glacial lobes derived from topographically-controlled ice spreading centers located around the basin instead of a single continental ice sheet. KEYWORDS:Late Paleozoic Ice Age; Itararé Group; glacial erosion; paleogeography. RESUMO: A Era Glacial Neopaleozoica está registrada na Bacia do Paraná através da sucessão sedimentar do Grupo Itararé e unidades correlatas, bem como por feições glaciotectônicas e formas de leito erosivas relacionadas à ação do gelo. Formas de leito erosivas são comumente utilizadas em análises paleogeográficas visando evidenciar o sentido de fluxo de geleiras e localizar antigos centros irradiadores de gelo. Neste trabalho é apresentada uma revisão da literatura e novos dados sobre formas de leito erosivas de micro a mesoescala

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Ice‐margin fluctuation sequences and grounding zone wedges: The record of the Late Palaeozoic Ice Age in the eastern Karoo Basin (Dwyka Group, South Africa)

Dietrich

Hofmann

2019

The Depositional Record

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In the eastern part of the Karoo Basin of South Africa, the sedimentary record of the Late Palaeozoic Ice Age, the Dwyka Group, consists of an up to 200 m thick accumulation of massive to crudely stratified diamictite occasionally interstratified with siltstone, sandstone and conglomerate horizons. Three distinct sedimentary units, separated by intervening glacial erosion surfaces, are viewed as ice‐margin fluctuation sequences. The lowermost one, resting on highly uneven, glacially abraded Archaean basement, has been interpreted as a grounding zone wedge deposited after the retreat and stabilization of the ice margin after the inundation of the Karoo Basin. The grounding zone wedge interpretation is based on its thickness (up to 100 m), the dominance of diamictite, and its facies assemblage and inferred depositional processes (rain‐out of debris, dropstone dumping, mass and debris flow, till). Overlying the grounding zone wedge, deposits are sedimentary units interpreted as glaciofluvial or ice‐contact delta and grounding zone wedges, respectively. By analogy with Quaternary sedimentary sequences, deposition of the Dwyka Group in the study area might have been very rapid (tens to hundreds of thousand years) and may hence correlate with the ultimate deglacial sequence of the Western Karoo Basin, as both successions are covered by the postglacial Ecca Group. Although commonly observed and imaged on modern, high‐latitude continental shelves, grounding zone wedges have never been interpreted in the ancient geological record. This paper therefore outlines a model defining criteria necessary for their identification.

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Facies and depositional architecture according to a jet efflux model of a late Paleozoic tidewater grounding-line system from the Itararé Group (Paraná Basin), southern Brazil

Cited by 39 publications

References 49 publications

Late Palaeozoic glacial cycles and subcycles in western Gondwana: Correlation of surface and subsurface data of the Paraná Basin, Brazil

Late Palaeozoic glacial cycles and subcycles in western Gondwana: Correlation of surface and subsurface data of the Paraná Basin, Brazil

A review on late Paleozoic ice-related erosional landforms in the Paraná Basin: origin and paleogeographical implications

Ice‐margin fluctuation sequences and grounding zone wedges: The record of the Late Palaeozoic Ice Age in the eastern Karoo Basin (Dwyka Group, South Africa)

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