Pavimento estriado da glaciação neopaleozóica, em Alfredo Wagner, Santa Catarina, Brasil

Campos, Antônio Carvalho; Machado, Leonardo; Santos, Paulo Roberto dos; Canuto, Juliana Ristow; Castro, Joel Carneiro de

doi:10.11606/issn.2316-8986.v19i0p39-46

Cited by 6 publications

(13 citation statements)

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“…3). Considering these characteristics and following Rocha-Campos et al (1988), the diamictites can be interpreted as lodgement tillites resting on a subglacially eroded, rigid substrate, corroborating thus the original interpretation of Barbosa (1940).…”

Section: Striated Pavementssupporting

confidence: 73%

“…An ice source located east of the Paraná Basin is well supported by the moutonnée of Salto (Almeida 1948), subglacial landforms in the Paraná state (Bigarella et al 1967, Trosdtorf et al 2005, the occurrence at Engenheiro Maia (Caetano-Chang et al 1990) and the striated surfaces found on the Precambrian basement in Santa Catarina state (Barbosa 1940, Carvalho 1940, Rocha-Campos et al 1988, Puigdomenech et al 2014. Nevertheless, localities in the southern Paraná state (southern flank of the Ponta Grossa arch) have a different orientation (N-S) when compared to the other localities, which show a consistent NW trend (Fig.…”

Section: Implications For Paleogeographymentioning

confidence: 98%

“…Still in Santa Catarina, Rocha-Campos et al (1988) documented a striated pavement at Alfredo Wagner, developed on Precambrian granite. The striations on this pavement lie on a gently undulated surface covered by laterally discontinuous, massive and stratified diamictites, the former being confined to narrow depressions (Fig.…”

Section: Striated Pavementsmentioning

confidence: 99%

“…Black shale with dropstones overlies the diamictite body and laterally, the shales drapes the granitic basement. According to Rocha-Campos et al (1988), crescentic gouges and fractures on the striated pavement allowed them to infer a paleo ice-flow towards the NW. Because of weathering, these features are no longer recognized (Fig.…”

Section: Striated Pavementsmentioning

confidence: 99%

“…Subsequently, several types of landforms were documented (e.g. Almeida 1948, Bigarella et al 1967, Rocha-Campos et al 1988, Gesicki et al 2002, Vesely & Assine 2002 as indicated in Figure 1 and Table 1. Evaluating the various types of landforms associated with strata of the Itararé Group will contribute to better resolve the size and extent of glaciation that influenced deposition in the Paraná Basin during the Carboniferous and Permian.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Striated Pavementssupporting

confidence: 73%

Section: Implications For Paleogeographymentioning

confidence: 98%

Section: Striated Pavementsmentioning

confidence: 99%

Section: Striated Pavementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2016

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Evolution of the Carboniferous-Early Cretaceous units of Paraná Basin from provenance studies based on U-Pb, Hf and O isotopes from detrital zircons

2016

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Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Paraná Basin, southern Brazil

Vesely

Trzaskos

Kipper

et al. 2015

Sedimentary Geology

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The Paraná Basin is a key locality in the context of the Late Paleozoic Ice Age (LPIA) because of its location east of the Andean proto-margin of Gondwana and west of contiguous interior basins today found in western Africa. In this paper we document the sedimentary record associated with an ice margin that reached the eastern border of the Paraná Basin during the Pennsylvanian, with the aim of interpreting the depositional environments and discussing paleogeographic implications. The examined stratigraphic succession is divided in four stacked facies associations that record an upward transition from subglacial to glaciomarine environments. Deposition took place during deglaciation but was punctuated by minor readvances of the ice margin that deformed the sediment pile. Tillites, well-preserved landforms of subglacial erosion and glaciotectonic deformational structures indicate that the ice flowed to the north and northwest and that the ice margin did not advance far throughout the basin during the glacial maximum. Consequently, time-equivalent glacial deposits that crop out in other localities of eastern Paraná Basin are better explained by assuming multiple smaller ice lobes instead of one single large glacier. These ice lobes flowed from an ice cap covering uplifted lands now located in western Namibia, where glacial deposits are younger and occur confined within paleovalleys cut onto the Precambrian basement. This conclusion corroborates the idea of a topographically-controlled ice-spreading center in southwestern Africa and does not support the view of a large polar ice sheet controlling deposition in the Paraná Basin during the LPIA.

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Pavimento estriado da glaciação neopaleozóica, em Alfredo Wagner, Santa Catarina, Brasil

Cited by 6 publications

References 0 publications

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

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

Evolution of the Carboniferous-Early Cretaceous units of Paraná Basin from provenance studies based on U-Pb, Hf and O isotopes from detrital zircons

Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Paraná Basin, southern Brazil

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