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

Rosa, Eduardo L.M.; Vesely, Fernando Farias; França, Almério Barros

doi:10.1590/2317-4889201620160050

Cited by 42 publications

(26 citation statements)

References 54 publications

(98 reference statements)

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“…Reconstruction of the SE Brazilian and southern African margins during the LPIA, adapted from [3] and [27], and with data from [19] and [20]. Known paleocurrent directions preserved in the Itararé Group and the paleo-ice flow directions reported here are shown.…”

Section: Discussionmentioning

confidence: 99%

First description of subglacial megalineations from the late Paleozoic ice age in southern Africa

et al. 2019

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We identify late Paleozoic ice age (LPIA) subglacial megalineations from field and geospatial imagery of the Twyfelfontein area of northern Namibia, and present the results of a geomorphometric analysis of those data. Asymmetric 0.1–1.5 km-long megawhalebacks indicate a paleo-ice flow to the northwest. We infer that an ice stream draining the LPIA Kaokoveld ice sheet existed within the proto-Huab River valley and that was comparable to ice streams in modern Antarctica. Recognition of a paleo-ice stream in northern Namibia supports interpretations of glaciogenic sedimentary successions (Itararé Group) in southern Brazil that suggest the presence of major, terrestrial glacial outlet systems in southern Africa during the LPIA.

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Section: Discussionmentioning

confidence: 99%

First description of subglacial megalineations from the late Paleozoic ice age in southern Africa

et al. 2019

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“…Subglacial landforms sculpted on bedrock or soft beds are the most reliable indicators of paleo-ice flow direction. The recognition of these structures associated with LPIA deposits in SW Gondwana has resulted in different models depicting the distribution of ice centers (e.g., Frakes and Crowell, 1969, 1970Crowell and Frakes, 1972;Martin, 1981;Santos et al, 1996;Isbell et al, 2012;Limarino et al, 2014;Rosa et al, 2016). In the eastern border of the Paraná Basin, numerous occurrences of subglacial landforms on the preglacial substrate or on subglacial diamictite have been documented, constraining paleo-ice flow towards the NW and N (e.g., Bigarella et al, 1967;Rocha-Campos et al, 1988;Trosdtorf et al, 2005;Fallgatter and Paim, 2017).…”

Section: Paleoglaciologic and Paleogeographic Implicationsmentioning

confidence: 99%

“…In the southeastern area of the Paraná Basin, about 750 km NE from the study area, the crystalline basement underlying glacial rocks of the Itararé Group contain streamlined landforms draped by thin tillites, which in turn are covered by thick marine mudstones of the Rio do Sul Formation (Rocha-Campos et al, 1988;Rosa et al, 2016). According to Fallgatter and Paim (2017), similar to the present study, the Rio do Sul strata are partially confined in a 30 m high subglacial topography and all subglacial lineations found in that area are oriented to the NW (azimuth 332°to 348°).…”

Section: Paleoglaciologic and Paleogeographic Implicationsmentioning

confidence: 99%

“…Multiple glacial lobes derived either from continental ice sheets or from smaller, topographically controlled ice caps have been interpreted in southeast South America. The reconstruction of these lobes and inferences regarding their paleoflow direction are mainly supported by erosional glacial landforms incised in the preglacial substrate, such as striated pavements, streamlined landforms, and glacial troughs and valleys (e.g., Frakes and Crowell, 1969;Rocha-Campos et al, 1988;Gesicki et al, 2002;Trosdtorf et al, 2005;Rosa et al, 2016;Fallgatter and Paim, 2017).…”

Section: Introductionmentioning

confidence: 99%

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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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“…The Itararé Group is stratigraphically positioned at the base of the Gondwana I sequence (Milani et al, ). This succession is composed predominantly of sandstones, diamictites, rhythmites, and shales, and the glacial influence is evidenced by rhythmites with dropstones, diamictites with faceted and striated clasts, and glacially striated pavements (França & Potter, ; Rosa et al, ; Schneider et al, ; Tomazelli & Soliani Junior, ; Vesely & Assine, ).…”

Section: Introductionmentioning

confidence: 99%

Orbital and Millennial‐Scale Cycles Paced Climate Variability During the Late Paleozoic Ice Age in the Southwestern Gondwana

Kochhann

Cagliari

Kochhann

et al. 2020

Geochem Geophys Geosyst

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Orbital cycles are related to variations of Earth's orbit through time and exert profound control on glacial and interglacial climates due to changes in insolation. In this study, we aim to test whether orbital and millennial‐scale climate cycles conditioned the deposition of rhythmites in the southern Gondwana during the Late Paleozoic Ice Age (LPIA). We present the first cyclostratigraphic study based on X‐ray fluorescence records from a 27‐m‐thick interval of LPIA rhythmites in the southeastern border of the Paraná Basin, Brazil. TiO2 and Fe2O3 records display cycles in the Milankovitch and millennial bands. Among millennial‐scale variability, there are strong signals suggesting cycles with periods similar to the ~2.4‐kyr Hallstatt heliomagnetic and the ~1.5‐kyr Dansgaard‐Oeschger cycles. We estimated an average sediment accumulation rate of 5.94 cm/kyr, which suggests that the rhythmites were deposited in a relatively distal setting, during deglaciation episodes paced by millennial‐scale climate cycles. We interpret variations in concentrations of the terrigenous components TiO2 and Fe2O3 as indicative of glacial‐interglacial changes, reflected by advances and retreats of glaciers under drier and wetter climate conditions, respectively. Here we show that these high‐latitude glacial‐interglacial cycles were probably paced by short eccentricity, as previously suggested for Carboniferous cyclothems in low‐latitude deposits, and highlight the importance of millennial‐scale climate cycles at controlling glacially influenced deposition at high latitudes. Our results for the LPIA are similar to patterns seen in Pleistocene records.

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

Cited by 42 publications

References 54 publications

First description of subglacial megalineations from the late Paleozoic ice age in southern Africa

First description of subglacial megalineations from the late Paleozoic ice age in southern Africa

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

Orbital and Millennial‐Scale Cycles Paced Climate Variability During the Late Paleozoic Ice Age in the Southwestern Gondwana

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