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Milankovitch cyclicity and the Boom Clay Formation: an Oligocene siliciclastic shelf sequence in Belgium

Published online by Cambridge University Press:  01 May 2009

E. Van Echelpoel  and
G. P. Weedon
E. Van Echelpoel
Affiliation:
Instituut voor Aardwetenschappen, Katholieke Universiteit Leuven, Redingenstraat 16, B-3000 Leuven, Belgium
G. P. Weedon
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, U.K.
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Abstract

The Boom Clay Formation of northeast Belgium consists of a sequence of alternating, laterally persistent beds of silt and clay. Power-spectral analysis of grain-size variations indicates regular sedimentary cycles with wavelengths of about 100 and 46cm that had periods of 124 and 57 thousand years (ka) or less. The lateral continuity ofthe beds, combined with the regularity and estimated periods of the cycles, suggests an indirect link to the 100 and 41 ka orbital (Milankovitch) cycles. The variations in meangrain size were caused by changing bottom-water turbulence as controlled by storms and/or glacio-eustatic water depth fluctuations. This study confirms that certain marinesiliciclastic sequences can provide proxy-records of palaeoclimatic variance.

Information

Type
Rapid Communications
Information
Geological Magazine , Volume 127 , Issue 6 , November 1990 , pp. 599 - 604
Copyright
Copyright © Cambridge University Press 1990

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