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Sedimentary rhythms in the Jurassic and Cretaceous of Svalbard

Published online by Cambridge University Press:  01 May 2009

Henning Dypvik
Henning Dypvik
Affiliation:
Department of Geology, University of Oslo, P.O.Box 1047, Blindern, N-0316 Oslo 3, Norway
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Abstract

The Janusfjellet Subgroup on Svalbard consists on a 400 to 500 m thick sequence representing shallow marine depositional environments. Coarsening-upward units, often separated by carbonate beds, are commonly found in rhythmic developments. Rhythmicities (285000(?) and 850000(?) years) in the sedimentary sections show periods which may reflect pulses in nearby sea-floor spreading or strike-slip fault regimes. An astronomical control of the cycles cannot be excluded, although such changes most probably should be expected in superimposed episodes of shorter duration.

Type
Articles
Information
Geological Magazine , Volume 129 , Issue 1 , January 1992 , pp. 93 - 99
Copyright
Copyright © Cambridge University Press 1992

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