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Metamorphosed Lamprophyres and the Late Thermal History of the Moines

Published online by Cambridge University Press:  01 May 2009

M. R. W. Johnson  and
I. W. D. Dalziel
M. R. W. Johnson
Affiliation:
Grant Institute of Geology, University of Edinburgh.
I. W. D. Dalziel
Affiliation:
Grant Institute of Geology, University of Edinburgh.
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Abstract

Certain lamprophyres in Moidart exhibit at least three sets of minor structures (cleavages, lineations and small-scale folds). During the formation of the first set the lamprophyres acquired a schistose fabric: hornblende and biotite laths crystallized along the axial surfaces of tightly compressed folds. The deformation episodes recognized in the lamprophyre sheets post-date the main episodes of major and minor folding (F1-F3) that affected the surrounding Moine gneisses. The existence of a metamorphic fabric in these lamprophyres raises interesting problems—was the thermal energy required to “metamorphose” the lamprophyres derived from deformational heat, or by a heat flow from the Moine country rocks, or were the lamprophyres deformed during cooling and consolidation from the magmatic state (autothermal metamorphism) ?

Type
Articles
Information
Geological Magazine , Volume 103 , Issue 3 , June 1966 , pp. 240 - 249
Copyright
Copyright © Cambridge University Press 1966

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References

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