Abstract
Smectitic clay, glauconite, pyrite, carbonate cement and silica occur concentrated in concentric zones around several m high and mm wide U-shaped burrows of Bathichnus paramoudrae, common in the Late Cretaceous Chalk of NW Europe. The minerals are authigenic and formed during bacterial metabolism and the decomposition of organic matter in 5 redox zones from aerobic near the burrow wall to anoxic in the surrounding deep sediment. The identification of the succession of redox zones and their specific mineral authigenesis contributes to a better definition of the early diagenetic conditions during deposition of bedded Chalk sequences characterised by a rhythmic vertical variation of the concentrations of the mentioned authigenic minerals.
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© 1995 Springer-Verlag
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(1995). Early diagenesis of chalk. In: The Sedimentology of Chalk. Lecture Notes in Earth Sciences, vol 54. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0028306
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DOI: https://doi.org/10.1007/BFb0028306
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Publisher Name: Springer, Berlin, Heidelberg
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