Glacial paradoxes during the late Paleozoic ice age: Evaluating the equilibrium line altitude as a control on glaciation
The late Paleozoic ice age (LPIA) consists of multiple glaciations that waxed and waned across Gondwana during the Carboniferous and Permian. Three key intervals are evaluated using the concept of the equilibrium-line altitude (ELA) as a control on glaciation to provide insight into two intervals of...
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ftconicet:oai:ri.conicet.gov.ar:11336/68220 2023-10-09T21:47:14+02:00 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 Oscar Fraiser, Margaret L. Koch, Zelenda J. Ciccioli, Patricia Lucia Dineen, Ashley A. application/pdf http://hdl.handle.net/11336/68220 eng eng Elsevier Science info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2011.11.005 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1342937X11003248 http://hdl.handle.net/11336/68220 Isbell, John L.; Henry, Lindsey C.; Gulbranson, Erik L.; Limarino, Carlos Oscar; Fraiser, Margaret L.; et al.; Glacial paradoxes during the late Paleozoic ice age: Evaluating the equilibrium line altitude as a control on glaciation; Elsevier Science; Gondwana Research; 22; 1; 7-2012; 1-19 1342-937X CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ Carboniferous Equilibrium Line Altitude Gondwana Glaciation Late Paleozoic Ice Age Paleoclimate Permian https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.gr.2011.11.005 2023-09-24T18:34:21Z The late Paleozoic ice age (LPIA) consists of multiple glaciations that waxed and waned across Gondwana during the Carboniferous and Permian. Three key intervals are evaluated using the concept of the equilibrium-line altitude (ELA) as a control on glaciation to provide insight into two intervals of paradoxical ice distribution during and following glaciation. The LPIA began in the mid-latitudes during the Viséan in western Argentina with the growth of glaciers in the Protoprecordillera. Glaciation was initiated by uplift of the range above the ELA. In the Bashkirian, deglaciation occurred there while glaciation was beginning at the same latitude in uplands associated with the Paraná Basin in Brazil. Analysis suggests that deglaciation of the Protoprecordillera occurred due to extensional collapse of the range below the ELA during a westward shift in the location of plate subduction. During Late Pennsylvanian-Early Permian peak glaciation for the LPIA, extensive glacimarine deposits indicate that glaciers reached sea level, which corresponds to a major lowering of the ELA due to global cooling. Finally, during the Early to early Late transition out of the LPIA, polar Gondwana was unglaciated. However, three glacial intervals occurred at mid- to high-latitudes in eastern Australia from the Sakmarian to the Capitanian/earliest Wuchiapingian. The magnitude of global cooling during these events is debatable as evidence indicates ice-free conditions and an elevated ELA at the South Pole in Antarctica. This suggests that severe global cooling was not the cause of the final three Australian glaciations, but rather that ELA-related conditions specific to eastern Australia drove these late-phase events. Possible causes for the Australian glaciations include: 1) anomalous cold conditions produced by coastal upwelling, 2) the presence of uplands allowing nucleation of glaciers, 3) fluctuations in pCO 2 levels, and 4) increased precipitation due to the location of the area in the subpolar low pressure belt. Fil: Isbell, ... Article in Journal/Newspaper Antarc* Antarctica South pole South pole CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Argentina South Pole Ela ENVELOPE(9.642,9.642,63.170,63.170) Isbell ENVELOPE(156.400,156.400,-82.367,-82.367) Gondwana Research 22 1 1 19 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Carboniferous Equilibrium Line Altitude Gondwana Glaciation Late Paleozoic Ice Age Paleoclimate Permian https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
Carboniferous Equilibrium Line Altitude Gondwana Glaciation Late Paleozoic Ice Age Paleoclimate Permian https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Isbell, John L. Henry, Lindsey C. Gulbranson, Erik L. Limarino, Carlos Oscar Fraiser, Margaret L. Koch, Zelenda J. Ciccioli, Patricia Lucia Dineen, Ashley A. Glacial paradoxes during the late Paleozoic ice age: Evaluating the equilibrium line altitude as a control on glaciation |
topic_facet |
Carboniferous Equilibrium Line Altitude Gondwana Glaciation Late Paleozoic Ice Age Paleoclimate Permian https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
The late Paleozoic ice age (LPIA) consists of multiple glaciations that waxed and waned across Gondwana during the Carboniferous and Permian. Three key intervals are evaluated using the concept of the equilibrium-line altitude (ELA) as a control on glaciation to provide insight into two intervals of paradoxical ice distribution during and following glaciation. The LPIA began in the mid-latitudes during the Viséan in western Argentina with the growth of glaciers in the Protoprecordillera. Glaciation was initiated by uplift of the range above the ELA. In the Bashkirian, deglaciation occurred there while glaciation was beginning at the same latitude in uplands associated with the Paraná Basin in Brazil. Analysis suggests that deglaciation of the Protoprecordillera occurred due to extensional collapse of the range below the ELA during a westward shift in the location of plate subduction. During Late Pennsylvanian-Early Permian peak glaciation for the LPIA, extensive glacimarine deposits indicate that glaciers reached sea level, which corresponds to a major lowering of the ELA due to global cooling. Finally, during the Early to early Late transition out of the LPIA, polar Gondwana was unglaciated. However, three glacial intervals occurred at mid- to high-latitudes in eastern Australia from the Sakmarian to the Capitanian/earliest Wuchiapingian. The magnitude of global cooling during these events is debatable as evidence indicates ice-free conditions and an elevated ELA at the South Pole in Antarctica. This suggests that severe global cooling was not the cause of the final three Australian glaciations, but rather that ELA-related conditions specific to eastern Australia drove these late-phase events. Possible causes for the Australian glaciations include: 1) anomalous cold conditions produced by coastal upwelling, 2) the presence of uplands allowing nucleation of glaciers, 3) fluctuations in pCO 2 levels, and 4) increased precipitation due to the location of the area in the subpolar low pressure belt. Fil: Isbell, ... |
format |
Article in Journal/Newspaper |
author |
Isbell, John L. Henry, Lindsey C. Gulbranson, Erik L. Limarino, Carlos Oscar Fraiser, Margaret L. Koch, Zelenda J. Ciccioli, Patricia Lucia Dineen, Ashley A. |
author_facet |
Isbell, John L. Henry, Lindsey C. Gulbranson, Erik L. Limarino, Carlos Oscar Fraiser, Margaret L. Koch, Zelenda J. Ciccioli, Patricia Lucia Dineen, Ashley A. |
author_sort |
Isbell, John L. |
title |
Glacial paradoxes during the late Paleozoic ice age: Evaluating the equilibrium line altitude as a control on glaciation |
title_short |
Glacial paradoxes during the late Paleozoic ice age: Evaluating the equilibrium line altitude as a control on glaciation |
title_full |
Glacial paradoxes during the late Paleozoic ice age: Evaluating the equilibrium line altitude as a control on glaciation |
title_fullStr |
Glacial paradoxes during the late Paleozoic ice age: Evaluating the equilibrium line altitude as a control on glaciation |
title_full_unstemmed |
Glacial paradoxes during the late Paleozoic ice age: Evaluating the equilibrium line altitude as a control on glaciation |
title_sort |
glacial paradoxes during the late paleozoic ice age: evaluating the equilibrium line altitude as a control on glaciation |
publisher |
Elsevier Science |
url |
http://hdl.handle.net/11336/68220 |
long_lat |
ENVELOPE(9.642,9.642,63.170,63.170) ENVELOPE(156.400,156.400,-82.367,-82.367) |
geographic |
Argentina South Pole Ela Isbell |
geographic_facet |
Argentina South Pole Ela Isbell |
genre |
Antarc* Antarctica South pole South pole |
genre_facet |
Antarc* Antarctica South pole South pole |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2011.11.005 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1342937X11003248 http://hdl.handle.net/11336/68220 Isbell, John L.; Henry, Lindsey C.; Gulbranson, Erik L.; Limarino, Carlos Oscar; Fraiser, Margaret L.; et al.; Glacial paradoxes during the late Paleozoic ice age: Evaluating the equilibrium line altitude as a control on glaciation; Elsevier Science; Gondwana Research; 22; 1; 7-2012; 1-19 1342-937X CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.gr.2011.11.005 |
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Gondwana Research |
container_volume |
22 |
container_issue |
1 |
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1 |
op_container_end_page |
19 |
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1779310206726963200 |