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Millennial scale climate cycles in Permian-Carboniferous rhythmites; permanent feature throughout geologic time?

Daniel R. Franco, Linda A. Hinnov and Marcia Ernesto
Millennial scale climate cycles in Permian-Carboniferous rhythmites; permanent feature throughout geologic time?
Geology (Boulder) (November 2011) 40 (1): 19-22

Abstract

Two late Paleozoic glacial rhythmite successions from the Itarare Group (Parana Basin, Brazil) were examined for paleoclimate variations. Paleomagnetic (characteristic remanent magnetization, ChRM) and magnetic susceptibility (K (sub z) ) measurements taken from the rhythmites are interpreted as paleoclimatic proxies. Ratios of low-frequency components in the K (sub z) variations suggest Milankovitch periodicities; this leads to recognition of other, millennial-scale variations reminiscent of abrupt climate changes during late Quaternary time, and are suggestive of Bond cycles and the 2.4 k.y. solar cycle. We infer from these patterns that millennial-scale climate change is not restricted to the Quaternary Period, and that millennial forcing mechanisms may have been prevalent throughout geologic time.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 40
Serial Issue: 1
Title: Millennial scale climate cycles in Permian-Carboniferous rhythmites; permanent feature throughout geologic time?
Affiliation: National Observatory, Department of Geophysics, Rio de Janeiro, Brazil
Pages: 19-22
Published: 20111123
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 2012-016321
Categories: StratigraphyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2012009
Illustration Description: illus. incl. geol. sketch map
S25°00'00" - S20°00'00", W54°00'00" - W49°00'00"
Secondary Affiliation: Johns Hopkins University, USA, United StatesUniversidade de Sao Paulo, BRA, Brazil
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201209
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