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Dolomitization of Siliceous Microfossils in Namurian Concretionary Limestones

Published online by Cambridge University Press:  01 May 2009

B. K. Holdsworth
B. K. Holdsworth
Affiliation:
Geology Department, The University, Keele, Staffs.
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Abstract

Early diagenetic, micritic, carbonate concretions from Namurian goniatite bands in Staffordshire and Derbyshire contain Radiolaria and sponges excellently preserved owing to replacement by ankeritic dolomite anhedra. The microfossils are detectable only by acid etching of limestone surfaces and thin sections. Preservation by the dolomite is believed to occur under restricted conditions in which silica solution and dolomite crystallization post-date a phase of rapid calcite crystallization.

Information

Type
Articles
Information
Geological Magazine , Volume 104 , Issue 2 , April 1967 , pp. 148 - 154
Copyright
Copyright © Cambridge University Press 1967

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References

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