Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-25T07:18:58.278Z Has data issue: false hasContentIssue false
  • English
  • Français

The Pen-y-gader Dolerite and its Metasomatic Effects on the Llyn-y-gader Sediments

Published online by Cambridge University Press:  01 May 2009

R. G. Davies
R. G. Davies
Affiliation:
Department of Geology, University College of Wales, Aberystwyth.
Get access Rights & Permissions [Opens in a new window]

Abstract

A petrochemical study of the Pen-y-Gader dolerite has been made. The intrusion produced a mild thermal metamorphism in the country sediments and then a late-stage metasomatism affecting the dolerite as well as producing spilosites and adinoles in the country rocks. The main metasomatism involved the introduction of sodium with small amounts of boron and fluorine into the sediments. The range of activity beneath the intrusion was governed by the porosity of the sediments affected, coarsegrained bands being followed for greater distances. The chemical and mineralogical variations within the dolerite have also been compared with those observed in certain of its ophitic neighbours.

Type
Articles
Information
Geological Magazine , Volume 93 , Issue 2 , April 1956 , pp. 153 - 172
Copyright
Copyright © Cambridge University Press 1956

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

List Of References

Agrell, S. O., 1939. The Adinoles of Dinas Head, Cornwall. Miner. Mag., xxv, 305–337.Google Scholar
Cox, A. H., 1925. The Geology of the Cader Idris Range. Quart. Journ. Geol. Soc., lxxxi, 539–592.CrossRefGoogle Scholar
Cox, A. H., and Wells, A. K., 1927. The Geology of the Dolgelly District, Merionethshire. Proc. Geol. Assoc., xxxviii, 265–318.CrossRefGoogle Scholar
Dewey, H., 1915. On spilosites and adinoles from north Cornwall. Trans. Roy. Geol. Soc. Cornwall, xv, 71–84.Google Scholar
Ramsay, A. C., 1866. Geology of North Wales. Mem. Geol. Surv., III, 27.Google Scholar
Shapiro, L., and Brannock, W. W., 1952. Rapid Analysis of Silicate Rocks. U.S. Geol. Surv. Circular, 165.Google Scholar