Hostname: page-component-78c5997874-dh8gc Total loading time: 0 Render date: 2024-11-14T23:16:17.511Z Has data issue: false hasContentIssue false
  • English
  • Français

I.—A Case of Metamorphism of Chalk

Published online by Cambridge University Press:  01 May 2009

Geo. C. Gough
Geo. C. Gough
Affiliation:
Professor of Natural History, Royal Agricultural College, Cirencester.
Get access Rights & Permissions [Opens in a new window]

Extract

Cases of metamorphosed limestones where the calcium carbonate has been converted by contact with some igneous magma into a calc-silicate rock are by no means rare, one of the best known being the conversion of the Coniston Limestone of the Lake District by the Shap Granite into a rock with various calc-silicate and other minerals such as Wollastonite, Omphacite, etc., as described by Messrs. Harker and Marr. But as far as I know, no case has been recorded where ordinary white chalk has been similarly changed. Dr. Hibsch describes a case of baculite marl containing Foraminifera which has been altered by contact with dolerite. The Foraminifera disappear and the rock becomes a granular limestone with epidote, forming a calc-silicate hornstone. This seems the nearest case to the alteration in co. Antrim I am about to describe.

Type
Original Articles
Information
Geological Magazine , Volume 4 , Issue 4 , April 1907 , pp. 145 - 148
Copyright
Copyright © Cambridge University Press 1907

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

page 145 note 1 Q.J.G.S., 1891.

page 145 note 2 Verhandlungen Geol. Reichsanstalt, 1889, p. 204.

page 145 note 3 Trans. G. S., vol. iii.

page 148 note 1 Q.J.G.S., vol. liii (1897).