Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-23T20:08:04.070Z Has data issue: false hasContentIssue false
  • English
  • Français

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.
Get access Rights & Permissions [Opens in a new window]

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.

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Bathurst, R. G. C, 1958. Diagenetic fabrics in some British Dinantian limestones. Lpool Manchr geol. J., 2, 11–36.CrossRefGoogle Scholar
De Laubenfels, M. W., 1955. In Treatise on invertebrate paleontology, E, Archaeocyatha and Porifera, Geol. Soc. America and Kansas Univ. Press, 21–122.Google Scholar
Holdsworth, B. K., 1964. Radiolarian nature of the thicker-shelled goniatite faunal phase in some Namurian limestone “ bullions ”. Nature, Lond., 201, 697–9.CrossRefGoogle Scholar
Holdsworth, B. K., 1966 a. Radiolaria and sponges in Namurian “bullion” limestones. Proc. geol. Soc. Lond., 1630, 34–5.Google Scholar
Holdsworth, B. K., 1966 b. Radiolaria from the Namurian of Derbyshire. Palaeontology, 9, 319–329.Google Scholar
Holdsworth, B. K., 1966 c. A preliminary study of the palaeontology and palaeoenvironment of some Namurian limestone “bullions”. The Mercian Geologist, 1, 315–337.Google Scholar
Howie, R. A., and Broadhurst, F. M., 1958. X-ray data for dolomite and ankerite. Am. Miner., 43, 1210–13.Google Scholar
Krauskopf, K. B., 1959. The geochemistry of silica in sedimentary environments. In Silica in sediments, Society of economic palaeontologists and mineralogists Special Publication No. 7, 4–19.Google Scholar