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The Petrography and Origin of Deposits filling Solution Pipes in the Chalk near South Mimms, Hertfordshire

Published online by Cambridge University Press:  01 May 2009

J. Thorez ,
P. Bullock ,
J. A. Catt  and
A. H. Weir
J. Thorez
Affiliation:
Institut de Minéralogie, Université de Liège, Belgium
P. Bullock
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
J. A. Catt
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
A. H. Weir
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
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Summary

Pipes and other solution cavities in the Upper Chalk near South Mimms contain deposits unlike those found in similar situations elsewhere in Great Britain. The cavities were formed near the sub-Palaeogene surface, and most of the deposits in them were derived from the basal Palaeogene beds (Thanetian and Sparnacian). A dark brown and very porous clay, which lines many of the pipes, is composed partly of the insoluble residue from the Chalk and partly of clay eluviated from the Palaeogene deposits. The clay was deposited from percolating water in spaces formed by dissolution of chalk at the margins of the pipes.

Type
Articles
Information
Geological Magazine , Volume 108 , Issue 5 , September 1971 , pp. 413 - 423
Copyright
Copyright © Cambridge University Press 1971

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