The paths and timing of late Paleozoic ice revisited: New stratigraphic and paleo-ice flow interpretations from a glacial succession in the upper Itararé Group (Paraná Basin, Brazil)

Mottin, Thammy Ellin; Vesely, Fernando Farias; Rodrigues, Mérolyn Camila Naves de Lima; Kipper, Felipe; Souza, Paulo Alves de

doi:10.1016/j.palaeo.2017.11.031

Cited by 57 publications

(68 citation statements)

References 75 publications

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“…The glacially abraded bedrock and the facies stacking composed of subglacial to proglacial deposits can be interpreted in terms of a glacial advance-retreat cycle similar to what have been described from other LPIA successions (e.g., Miller, 1989;França and Potter, 1991;Visser, 1997;Vesely and Assine, 2006;Vesely et al, 2015;Fallgatter and Paim, 2017;Valdez-Buso et al, 2017;Mottin et al, 2018). These deglaciation sequences record complete cycles of glacial advance and retreat either in terrestrial and marine environments and are often almost entirely composed of deposits accumulated during ice-margin retreat or deglaciation (Visser, 1997;Vesely and Assine, 2006).…”

Section: Glacial Stratigraphysupporting

confidence: 63%

“…During deglaciation, glacio-isostatic uplifting (rebound) may generate unconformities and cause the accumulation of regressive successions if tectonically-induced sea-level fall and increasing sedimentation rates overcome glacio-eustatic rise (e.g., Boulton, 1990). Similar sedimentary products of glacio-isostatic regressions and associated depositional events have been interpreted from Quaternary (Nutz et al, 2015;Dietrich et al, 2017), late Paleozoic (Mottin et al, 2018) and Ordovician (Le Heron et al, 2006) glacial records.…”

Section: Glacial Stratigraphymentioning

confidence: 81%

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Exhumed subglacial landscape in Uruguay: Erosional landforms, depositional environments, and paleo-ice flow in the context of the late Paleozoic Gondwanan glaciation

Assine

Ana

Veroslavsky

et al. 2018

Sedimentary Geology

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A well-exposed glacial surface sculpted on Precambrian crystalline basement rocks occurs below the glacial succession of the San Gregorio Formation on the eastern border of the Chaco-Parana Basin in Uruguay and was formed in the context of the late Paleozoic Gondwana Ice Age. On the glacial surface are asymmetric parallel streamlined bedrock landforms interpreted as whalebacks. The downglacier (lee-side) faces of the whalebacks have gentle slopes dipping NNW with striated and sometimes polished surfaces on crystalline rocks. These landforms are covered by 10-100-cm-thick layers of tillites and shear-laminated siltstones, suggesting glacial abrasion produced mainly by subglacial till sliding. The subglacial facies are ice-molded, and exhibit meso-scale glacial lineations such as ridges and grooves up to 30 m long and 30 cm deep. The subglacial association is directly overlain by proglacial fine-grained facies (rhythmites) with dropstones indicating a subaqueous depositional environment following ice-margin retreat. The fine-grained facies are erosively cut by a succession of sandstones with wave-generated stratification resting on a basal conglomerate. Intraformational striated surfaces, NNEoriented, were found on four distinct bedding planes within the sandstone package and interpreted as ice keel scour marks produced by floating ice. The San Gregorio deposits are partially confined in a wide and shallow subglacial trough and the stratigraphic succession is interpreted as the record of a glacial advance-retreat cycle comparable to deglacial sequences from other late Paleozoic localities. The paleo-ice flow to the NNW indicated by subglacial lineations is parallel to that verified in the southernmost Paraná Basin located north of the study area, suggesting a paleogeographic scenario in which glaciers advanced northward into a glaciomarine environment. The proposed palaeogeography does not confirm the previous hypothesis of an ice center on the Sul-Riograndense Shield but, instead, it corroborates a south-derived Uruguayan Ice Lobe advancing to the north, probably with provenance far afield in terranes of the present-day southern African.

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Section: Glacial Stratigraphysupporting

confidence: 63%

Section: Glacial Stratigraphymentioning

confidence: 81%

Exhumed subglacial landscape in Uruguay: Erosional landforms, depositional environments, and paleo-ice flow in the context of the late Paleozoic Gondwanan glaciation

Assine

Ana

Veroslavsky

et al. 2018

Sedimentary Geology

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“…Field-based case studies and numerical stratigraphic modelling have recently demonstrated that forced-regressive deposits have preservation potential in depositional successions (Strong & Paola, 2008;Holbrook & Bhattacharya, 2012). Glacio-isostatically forced pro-to postglacial suites should then be an essential component of deglacial sequences (Boulton, 1990;Corner, 2006;Shaw et al 2008;Eilertsen et al 2011;Storms et al 2012;Hein et al 2014;Nutz et al 2015;Zecchin et al 2015;Dietrich et al 2017a), even if such records remain uncommonly recognised in the deep-time glacial record (e.g., Haldorsen et al 2001;Pazos, 2002;Ghienne, 2003;Le Heron et al 2006;Creveling et al 2016;Mottin et al, 2017). In this contribution, we take advantage of offshore geophysical data (Lajeunesse et al this volume) combined with onshore facies analyses and LiDAR imagery from the Québec North Shore (eastern Canada, Fig.…”

mentioning

confidence: 99%

Deglacial sequences and glacio-isostatic adjustment: Quaternary compared with Ordovician glaciations

Dietrich

Ghienne

Lajeunesse

et al. 2018

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Deglacial sedimentary sequences recording the decay and final demise of ice sheets result from intricate interactions between the pattern of ice margin retreat, inherited basin physiography and relative sea-level (RSL) changes. A specific emphasis is here given to the glacio-isostatic adjustement (GIA), which may force postglacial local RSL fall in spite of concomitant glacio-eustatic rise. In this contribution, we characterize a Quaternary deglacial succession emplaced in such a setting, subsequently used as an analogue to interpret an end-Ordovician deglacial record. The Quaternary deglacial succession, tens of meters thick, formed under condition of RSL fall forced by the GIA in ca. 10,000 years in the aftermath of the deglaciation. This sedimentary succession consists of a lower, fining-upward sequence representing the backstepping of ice-contact depocenters following the retreat of the ice margin, and an upper, coarsening-upward sequence that relates to the subsequent progradation of a glaciofluvial delta system. A very similar stratigraphic stacking pattern characterizes the Ordovician analogue, suggesting a comparable deglacial sequence. By analogy with the Quaternary succession, this ancient deglacial record would have hence been emplaced under conditions of RSL fall forced by the GIA. Moreover, it must only represent a very short time interval that could be viewed as virtually instantaneous regarding the Late Ordovician glaciation. Such a vision is at odds with commonly accepted interpretations for such successions.

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“…É possível que os estratos de Salto sobre os granitos sejam os registros mais basais e antigos do Grupo Itararé na área, colocados adjacentes aos estratos mais recentes da área-Itu em função da reativação tectônica pós-deposicional da Falha de Itu. Mudanças nas espessuras dos estra-tos na Bacia do Paraná devem ter sido influenciadas por eventos tectônicos sin-deposicionais, pelo menos durante as fases iniciais do Grupo Itararé ) e pós-deposicionais (NEVES 2005, EZAKI 2011 (MOTTIN et al 2018). Admitindo-se a hipótese do Itararé estar restrito ao Carbonífero, as áreas Salto e Itu estariam mais próximas ao centro glacial inferido na Namíbia.…”

Section: Discussionunclassified

“…Uma das características marcantes do Grupo Itararé é a heterogeneidade de fácies, incluindo diversas litologias, com destaque aos tilitos, diamictitos, arenitos, siltitos, folhelhos e ritmitos; subordinadamente ocorrem camadas de carvões e carbonatos (ROCHA-CAMPOS 1967, SCHNEIDER et al 1974. Tal variedade litofaciológica é resultado dos múltiplos processos de avanço e retração de lobos glaciais, em paleoambientes continentais a marinhos (SANTOS et al 1996, VESELY et al 2015, MOTTIN et al 2018. Maiores detalhamentos sobre o significado das associações de fácies no contexto da estratigrafia de sequência foram oferecidos por outros autores (VESELY & ASSINE 2004CASTRO et al 2005).…”

Section: Introductionunclassified

Grupo Itararé na região de Itu, estado de São Paulo: intensos processos glaciais erosivos e deposicionais

Petri¹,

Pérez-Aguilar²,

Chahud³

et al. 2019

Rev. Inst. Geol.

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RESUMOO Grupo Itararé, Neopaleozoico da Bacia do Paraná, está exposto em grande parte da faixa leste do Estado de São Paulo, predominantemente sobre rochas pré-cambrianas. As áreas aqui designadas Itu e Salto são notáveis pela abundância de registros glaciais, embora de natureza distinta. Este trabalho discute as feições glaciais presentes nessas áreas como subsídio para reconstruções paleoambientais, partindo-se de estudos prévios, e traz observações inéditas de uma frente sedimentar exposta, por escavação, na Pedreira Colonial. Na área-Salto, o destaque são as evidências de forte ação erosiva glacial, tais como, rochas moutonnées, só encontradas no Brasil nessa região, e pavimentos estriados, associados a tilitos, diamictitos e depósitos aquoso-glaciais que atingem até 20 m de espessura. Na área-Itu, destacam-se os espessos depósitos aquoso--glaciais e, subordinadamente, diamictitos e tilitos que podem alcançar até 300 m de espessura. ABSTRACT THE ITARARÉ GROUP IN THE REGION OF ITU, STATE OF SÃO PAULO: INTENSE GLACIAL EROSIONAL AND DEPOSITIONAL PROCESSES. The ItararéGroup, Neopaleozoic of the Paraná Basin, is exposed in a large area of the eastern part of State of São Paulo, predominantly overlying Precambrian rocks. Although of distinctive nature, the areas named here Itu and Salto, are notable for the abundance of glacial records. As a contribution to paleoenvironmental reconstructions, this paper analyzes the glacial features present in these areas, starting from previous studies and including new observations of a sedimentary front exposed in the Colonial Quarry. The Salto area stands out for the evidences of strong glacial erosive action, such as roches moutonnées, which are only found in this region in Brazil, and striated pavements, associated with tillites, diamictites and glacial aqueous deposits that reach up to 20 m in thickness. Contrastingly, thick glacial aqueous deposits reaching 300 m in thickness stand out in the Itu area, with subordinate tillites and diamictites.

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The paths and timing of late Paleozoic ice revisited: New stratigraphic and paleo-ice flow interpretations from a glacial succession in the upper Itararé Group (Paraná Basin, Brazil)

Cited by 57 publications

References 75 publications

Exhumed subglacial landscape in Uruguay: Erosional landforms, depositional environments, and paleo-ice flow in the context of the late Paleozoic Gondwanan glaciation

Exhumed subglacial landscape in Uruguay: Erosional landforms, depositional environments, and paleo-ice flow in the context of the late Paleozoic Gondwanan glaciation

Deglacial sequences and glacio-isostatic adjustment: Quaternary compared with Ordovician glaciations

Grupo Itararé na região de Itu, estado de São Paulo: intensos processos glaciais erosivos e deposicionais

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