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Itarare Subgroup
High-latitude ice and climate control on sediment supply across SW Gondwana during the late Carboniferous and early Permian
Late Paleozoic Ice-Age rhythmites in the southernmost Paraná Basin: A sedimentological and paleoenvironmental analysis
U-Pb Zircon Dating of Ash Fall Deposits from the Paleozoic Paraná Basin of Brazil and Uruguay: A Reevaluation of the Stratigraphic Correlations
Recurrent emplacement of non-glacial diamictite during the late Paleozoic ice age
Age constraints of the glaciation in the Paraná Basin: evidence from new U–Pb dates
FIRST REPORT OF FEEDING TRACES IN PERMIAN BOTRYCHIOPSIS LEAVES FROM WESTERN GONDWANA
First Articulated Sponge from the Paleozoic of Brazil, and a New Organization of the Order Hemidiscosa
Millennial-scale climate cycles in Permian–Carboniferous rhythmites: Permanent feature throughout geologic time?
In the early Pennsylvanian, glacial lobes draining from an ice sheet probably centered on the northern highlands of Namibia (Windhoek ice sheet) reached the eastern margin of the marine-flooded Paraná Basin in southeastern and southern Brazil. Here, the glacier lobes extended at least 50 km across the depositional surface and terminated in a grounded tidewater system. The late Paleozoic paleolatitude of 40°–50°S of the Paraná Basin is consistent with a temperate warm-based regime for the glaciers. Accumulation of glacially influenced sediments in the main northern depocenter of the rapidly subsiding cratonic depression may have been preceded by deposition of proglacial sandy deposits (Lagoa Azul Formation; terrestrial?). Glacier displacement seems to have been controlled mainly by glacial-estuarine or attenuated fjord-like coastal inlets. The glacial lobes initially moved over highly eroded Precambrian to early Paleozoic crystalline rocks, then middle Paleozoic sedimentary rocks, and eventually over their own deposits. Multiple advance-retreat phases left a carpet of subglacial and meltwater deposits both on land and along the basin margin, although the former deposits have been almost completely eroded away. Continued, albeit less intense, tectonic subsidence of the basin led to southward displacement of the depocenter and more widespread sediment deposition. An ice cap centered on the Rio Grande do Sul shield was drained by lobes that flowed along radially distributed preglacial valleys. On the western basin margin, reduced numbers of lobes not connected to a recognizable major ice mass (or masses) seem to have moved toward the southeast. Destabilized glacigenic debris (mainly sand, diamicton, and mud) accumulated proglacially on the basin ramp and moved downslope by mass-flow processes, resulting in thick and laterally extensive packages of sand and diamicton interbedded with laminites and shales (Lagoa Azul, Campo Mourão, and Taciba Formations). Ubiquitous dropstones in laminites and in massive silty-clayey diamictons point to deposition by rain-out from sediment plumes and icebergs. Repetitive sedimentary cycles consisting of alternations between limited terrestrial facies and intraformational evidence of subglacial processes indicate that glacial conditions in the Paraná Basin persisted for 17–27 m.y. Glacial deposits are overlain by shallow-marine deltaic, coal-bearing sandstone of the Rio Bonito Formation and equivalent beds.
The Bashkirian to Sakmarian-Artinskian Itararé subgroup provides a record of the evolution of the Permian-Carboniferous glaciation in the Paraná Basin (Brazil). The glaciogenic succession was deposited under the influence of glaciers incoming from southwestern Africa. This paper presents an overview of the third-order sequence stratigraphy of that succession and a biostratigraphic summary, showing that: (1) the most complete and thick outcrop portion of the glaciogenic succession occurs in the northeastern part of the Paraná Basin, where several (at least nine) major cycles of ice advance and retreat can be recognized during the development of the Itararé subgroup; (2) biostratigraphically, two well-defined stratigraphic gaps within the Permian-Carboniferous succession are recognized, one within the Itararé subgroup, related to the Lapa–Vila Velha incised valley fill, and another at the Itararé–Rio Bonito boundary, both of which represent regional sequence boundaries; and (3) the transition between palynozones Crucisaccites monoletus and Vittatina costabilis is associated with the maximum flooding surface represented by the marine Lontras Shale, a regional marker bed located in the upper third of the glaciogenic succession.