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Late Paleozoic cyclic strata of Euramerica; recognition of Gondwanan glacial signatures during periods of thermal subsidence

M. R. Gibling and Michael C. Rygel
Late Paleozoic cyclic strata of Euramerica; recognition of Gondwanan glacial signatures during periods of thermal subsidence (in Resolving the late Paleozoic ice age in time and space, Christopher R. Fielding (editor), Tracy D. Frank (editor) and John L. Isbell (editor))
Special Paper - Geological Society of America (2008) 441: 219-233

Abstract

In paleoequatorial parts of Europe and North America, late Paleozoic cyclic successions are widely inferred to reflect glacio-eustasy. However, many of these successions accumulated in basins in the Pangean collisional zone, where variations in tectonics and sediment supply could also have generated cyclic successions. Cyclic successions are ubiquitous in the Maritimes Basin of Atlantic Canada but are especially prominent in the Visean and Bolsovian to Cantabrian, when subsidence rates on coastal plains were low and probably steady during periods of thermal subsidence. During relatively humid climatic conditions in the Bolsovian to Cantabrian, fluvial systems generated clastic cyclic successions with deep valleys and mature interfluve paleosols, providing strong evidence for alternate rise and fall of sea level-a characteristic glacio-eustatic feature. Under arid conditions in the Visean, with few rivers, carbonate-evaporite rhythms formed with little evidence for incision. Comparisons with near- and far-field records for Gondwanan glacial activity suggest that these two periods correspond to sea-level changes on the order of a few tens of meters, probably due to melting and accumulation of small ice caps rather than continent-wide ice sheets. Cyclic successions that formed in basins undergoing steady thermal subsidence may provide the most reliable evidence for glacio-eustasy in the paleoequatorial realm.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 441
Title: Late Paleozoic cyclic strata of Euramerica; recognition of Gondwanan glacial signatures during periods of thermal subsidence
Title: Resolving the late Paleozoic ice age in time and space
Author(s): Gibling, M. R.Rygel, Michael C.
Author(s): Fielding, Christopher R.editor
Author(s): Frank, Tracy D.editor
Author(s): Isbell, John L.editor
Affiliation: Dalhousie University, Department of Earth Sciences, Halifax, NS, Canada
Affiliation: University of Nebraska Lincoln, Department of Geosciences, Lincoln, NE, United States
Pages: 219-233
Published: 2008
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-8137-2441-6
Meeting name: Late Paleozoic ice age; toward a more refined understanding of timing, duration, and character
Meeting location: Salt Lake City, UT, USA, United States
Meeting date: 20050821Oct. 21, 2005
References: 91
Accession Number: 2008-123133
Categories: Stratigraphy
Document Type: Serial Conference document
Bibliographic Level: Analytic
Annotation: NSF Grant EAR-0417578
Illustration Description: illus. incl. sect., strat. cols., 2 tables, geol. sketch map
N45°00'00" - N47°00'00", W64°00'00" - W60°00'00"
Secondary Affiliation: University of Wisconsin Milwaukee, USA, United StatesState University of New York College at Potsdam, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200847
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