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Long-period orbital climate forcing in the early Palaeozoic?

Cherns, Lesley, Wheeley, James Robinson, Popov, L. E., Ghobadi Pour, M., Owens, R. M. and Hemsley, Alan Richard 2013. Long-period orbital climate forcing in the early Palaeozoic? Journal of the Geological Society 170 (5) , pp. 707-710. 10.1144/jgs2012-122

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Abstract

Facies indicators and geochemical proxies of early Palaeozoic global climate cooling suggest episodes of fluctuating glacio-eustasy and severe cold or glaciation from the Mid–Late Cambrian to Silurian (c. 85 myr), with a mean frequency of 2.6 myr. Long-period orbital time series predicted through the Phanerozoic are used to generate sine waves to test against these data; the null hypothesis of no orbital influence is rejected with a high confidence level. Cooling episodes appear most frequent through the Late Ordovician leading up to the Hirnantian glacial maximum, but even ‘greenhouse’ intervals of the Early–Mid-Ordovician and early Silurian provide evidence for periodic cooling episodes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Publisher: Geological Society of London
ISSN: 0016-7649
Last Modified: 04 Jun 2017 05:11
URI: http://orca.cf.ac.uk/id/eprint/49390

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