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Geochemical constraints on the origin of enigmatic cemented chalks, Norfolk, UK

Published online by Cambridge University Press:  17 September 2008

G. WOOLHOUSE ,
J. E. ANDREWS ,
A. MARCA-BELL  and
P. F. DENNIS
G. WOOLHOUSE
Affiliation:
School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
J. E. ANDREWS*
Affiliation:
School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
A. MARCA-BELL
Affiliation:
School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
P. F. DENNIS
Affiliation:
School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
*
†Author for correspondence: [email protected]
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Abstract

Very hard cemented chalk stacks and crusts found locally in the upper part of the Cretaceous Chalk of north Norfolk, UK, are related to solution features. The solution features, mainly pipes and caves, formed after deposition of the overlying Middle Pleistocene Wroxham Crag, probably by routing of sub-glacial, or glacial, melt-waters derived from late Pleistocene glaciers. New geochemical (particularly stable isotope) data shows that cementation of the chalks, although related spatially to the solution features, was not caused by glacier-derived waters. The carbon isotope composition of the chalk cements is typically around −9.5‰, indicative of biologically active soils. Moreover, the oxygen isotope compositions of the cements, around −5‰, are incompatible with water δ18O values much below −9 to −10‰ (which probably precludes isotopically negative glacier-derived water), as resulting palaeo-temperatures are below zero. Taken together, the isotope data suggest chalk cementation occurred under interglacial conditions similar to the present. Dissolved calcium carbonate for cementation came from dissolution of reworked chalk in overlying MIS 12 glacial tills.

Keywords

chalkcemented chalkcalcitepalaeotemperaturestable isotopestrace elements
Type
Original Article
Information
Geological Magazine , Volume 146 , Issue 2 , March 2009 , pp. 291 - 299
Copyright
Copyright © Cambridge University Press 2008

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Footnotes

*

Present address: HR Wallingford, Howbery Park, Wallingford, Oxfordshire OX10 8BA, UK.

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