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Hertzian fracture, a principal mechanism in the emplacement of the British Tertiary intrusive centres

Published online by Cambridge University Press:  01 May 2009

Dov Bahat
Dov Bahat
Affiliation:
Department of Geology and Mineralogy, Ben Gurion University of the Negev, Beer Sheva, Israel
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Summary

In the British Tertiary intrusive centres emplacement of cone-sheets, ring-dykes and related magmatic bodies followed in shape and sequence the pattern of Hertzian fracture produced in the country rock by the magmatic diapir. In Ardnamurchan doming of the country rock, conic fracture and intrusion of cone-sheets started the development of the intrusive centre. Following that, pressure was reduced and strain relaxation occurred which resulted in arcuate and median fractures. These fractures were later on intruded by magma, hence ring-dykes (curved flanges) were formed. Resumption of pressure initiated the second cycle of cone fractures (and inner cone-sheets of centre 2).

Type
Articles
Information
Geological Magazine , Volume 117 , Issue 5 , September 1980 , pp. 463 - 470
Copyright
Copyright © Cambridge University Press 1980

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