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Millennial-scale climate cycles in Permian–Carboniferous rhythmites: Permanent feature throughout geologic time?

2011; Geological Society of America; Volume: 40; Issue: 1 Linguagem: Inglês

10.1130/g32338.1

1943-2682

Daniel R. Franco, Linda A. Hinnov, Márcia Ernesto,

Geological formations and processes

Research Article| January 01, 2012 Millennial-scale climate cycles in Permian–Carboniferous rhythmites: Permanent feature throughout geologic time? Daniel R. Franco; Daniel R. Franco * 1Department of Geophysics, National Observatory, Rua General José Cristino 77, 20921-400 Rio de Janeiro, RJ, Brazil *E-mail: drfranco@on.br. Search for other works by this author on: GSW Google Scholar Linda A. Hinnov; Linda A. Hinnov 2Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA Search for other works by this author on: GSW Google Scholar Marcia Ernesto Marcia Ernesto 3Department of Geophysics, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Rua do Matão, 1226, 05508-900 São Paulo, SP, Brazil Search for other works by this author on: GSW Google Scholar Geology (2012) 40 (1): 19–22. https://doi.org/10.1130/G32338.1 Article history received: 04 Apr 2011 rev-recd: 01 Aug 2011 accepted: 10 Aug 2011 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Daniel R. Franco, Linda A. Hinnov, Marcia Ernesto; Millennial-scale climate cycles in Permian–Carboniferous rhythmites: Permanent feature throughout geologic time?. Geology 2012;; 40 (1): 19–22. doi: https://doi.org/10.1130/G32338.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Two late Paleozoic glacial rhythmite successions from the Itararé Group (Paraná Basin, Brazil) were examined for paleoclimate variations. Paleomagnetic (characteristic remanent magnetization, ChRM) and magnetic susceptibility (Kz) measurements taken from the rhythmites are interpreted as paleoclimatic proxies. Ratios of low-frequency components in the Kz 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.