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Journal of the Geological Society; 1990; v. 147; issue.6; p. 915-918;
DOI: 10.1144/gsjgs.147.6.0915
© 1990 Geological Society of London

SHORT PAPER

Regular and irregular climatic cycles and the Belemnite Marls (Pliensbachian, Lower Jurassic, Wessex Basin)

G. P. WEEDON1 & H. C. JENKYNS2

1 Department of Earth Sciences, The University, Cambridge CB2 3EQ, UK
2 Department of Earth Sciences, The University, Oxford OX1 3PR, UK

Time series of carbonate and organic-carbon values are reported for 10.5 m of the Belemnite Marls. The light and dark marl beds form decimetre-scale couplets and metre-scale bundles. Light marls are carbon-poor and carbonate-rich whereas dark marls and laminated shales are carbon-rich and carbonate-poor. Sediment composition appears to have been indirectly controlled by climate; the regular couplets may record orbital-precession cycles (20 ka). However, the bundles cannot be linked to changes in eccentricity; rather they apparently record irregular, large-amplitude climatic variations with periods of a few hundred thousand years. It should not be assumed that 100–400 ka cyclicity in climate-related sedimentary sequences can be explained only by orbital forcing.




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