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Inverse relation between ice extent and the late Paleozoic glacial record of Gondwana

Gustavo Gonzalez-Bonorino and Nicholas Eyles
Inverse relation between ice extent and the late Paleozoic glacial record of Gondwana
Geology (Boulder) (November 1995) 23 (11): 1015-1018

Abstract

The late Carboniferous-earliest Permian age estimate (300-280 Ma) for maximum ice volume during late Paleozoic glaciation of Gondwana is challenged. Past estimates assume a direct relation between extent of depositional glacial record and former ice cover; this assumption cannot be sustained, given that the glacial record is composed predominantly of glacially influenced marine strata that accumulated on the margins of ice-covered areas. We argue that Gondwana ice cover expanded in the Early Carboniferous in response to polar position, availability of moisture from a mediterranean sea, and epeirogenic uplift of the Gondwana interior. In Namurian time (ca. 325 Ma), Gondwana ice cover attained a maximum extent of about 21X10 (super 6) km (super 2) , nearly the area of maximum Pleistocene ice cover. Despite extensive ice cover, the depositional record is meager; continental glacial deposits are poorly preserved on a regional unconformity. Thereafter, extensional subsidence of intracratonic basins promoted marine flooding, fragmentation of the ice cover, and the accumulation of thick glacially influenced marine deposits. In Stephanian-Asselian time (ca. 285 Ma), ice cover had decreased to about 15X10 (super 6) km (super 2) , but glacial marine strata were being deposited and preserved across a very large area of the Gondwana supercontinent.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 23
Serial Issue: 11
Title: Inverse relation between ice extent and the late Paleozoic glacial record of Gondwana
Affiliation: University of Toronto, Environmental Earth Sciences, Scarborough, ON, Canada
Pages: 1015-1018
Published: 199511
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 36
Accession Number: 1996-002276
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199601
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