Glacial paradoxes during the late Paleozoic ice age: Evaluating the equilibrium line altitude as a control on glaciation

Isbell, John L.; Henry, Lindsey C.; Gulbranson, Erik L.; Limarino, Carlos Óscar; Fraiser, Margaret L.; Koch, Zelenda J.; Ciccioli, Patricia L.; Dineen, Ashley A.

doi:10.1016/j.gr.2011.11.005

Cited by 308 publications

(195 citation statements)

References 130 publications

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“…This tectonic event was probably the cause for uplifting the land above the equilibrium-line altitude, leading to net snow accumulation and glacier growth (e.g. Isbell et al 2012).…”

Section: Implications For Paleogeographymentioning

confidence: 99%

“…Since these papers, different studies were performed attempting to determine the extent, timing and paths of LPIA icesheets (e.g. Veevers & Powell 1987, Visser 1987, Santos et al 1996, Gesicki et al 2002, Starck & Papa 2006, Isbell et al 2012.…”

Section: Introductionmentioning

confidence: 99%

“…The other hypothesis suggests several smaller ice masses controlled by the equilibrium-line altitude that expanded and retreated in several glacial-interglacial periods about 1 to 8 Ma-long each, totalizing an ice age of about 72 Ma of duration (e.g. Fielding et al 2008, Isbell et al 2012.…”

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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“…This tectonic event was probably the cause for uplifting the land above the equilibrium-line altitude, leading to net snow accumulation and glacier growth (e.g. Isbell et al 2012).…”

Section: Implications For Paleogeographymentioning

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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“…1). At the time, the Beardmore area was well within the southern polar circle, probably at a latitude higher than 70 o S (Powell and Li, 1994;Lawver et al, 2008;Isbell et al, 2012).…”

Section: Geologic Paleogeographic Paleoenvironmental and Paleoclimamentioning

confidence: 99%

Highly productive polar forests from the Permian of Antarctica

Miller

Knepprath

Cantrill

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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Two stratigraphically closely spaced bedding planes exposed at Lamping Peak in the Upper Buckley Formation, Beardmore Glacier area, Antarctica contain abundant in situ stumps (n=53, n=21) and other plant fossils that allow reconstruction of forest structure and biomass of Glossopteris forests that thrived at Presence of these highly productive fossil forests at high paleolatitude is consistent with hothouse conditions during the Late Permian, prior to the eruption of the Siberian flood basalts.

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“…At this time ecosystems were populated by very different plants from those that have dominated Cenozoic landscapes (e.g., Boyce et al, 2010;Gastaldo et al, 1996;Pfefferkorn et al, 2008), and the Earth's continents were initiating the assembly of the supercontinent of Pangea. There were nonetheless rapid and spatially extensive responses to changing global climates driven by changes in the volume of polar ice at multiple International Journal of Coal Geology 119 (2013) [177][178][179][180][181][182][183][184][185][186] spatial and temporal scales Isbell et al, 2012;Montañez and Poulsen, 2013).…”

Section: Introductionmentioning

confidence: 99%

Late Paleozoic continental warming of a cold tropical basin and floristic change in western Pangea

Tabor

DiMichele

Montañez

et al. 2013

International Journal of Coal Geology

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Glacial paradoxes during the late Paleozoic ice age: Evaluating the equilibrium line altitude as a control on glaciation

Cited by 308 publications

References 130 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

Highly productive polar forests from the Permian of Antarctica

Late Paleozoic continental warming of a cold tropical basin and floristic change in western Pangea

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