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III.—Some Tertiary Dykes of the Clyde Area

Published online by Cambridge University Press:  01 May 2009

G. W. Tyrrell A.R.C.Sc., F.G.S.
G. W. Tyrrell A.R.C.Sc., F.G.S.
Affiliation:
Lecturer in Mineralogy and Petrology, Glasgow University.
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Extract

Leidleite and Inninmorite.—Typical rocks of these groups are as yet unknown in the Clyde area. A N.N.W. dyke at Barrassie Sands, near Troon (Ayrshire), has points in common with leidleite. It shows anorthite phenocrysts in a subvariolitic groundmass of acicular felspar and augite, enveloped in a partially devitrified glassy base. A north–south dyke at the north end of Loch Fad, Bute, may perhaps be regarded as a doleritic end-variety of leidleite (see Anderson & Radley, 1916, fig. 2b, p. 208). A pitchstone-like dyke from the Smurig Burn in the south of Arran has all the characters of leidleite, except that it carries rather abundant granular augite, instead of acicular crystals.

Type
Original Articles
Information
Geological Magazine , Volume 4 , Issue 8 , August 1917 , pp. 350 - 356
Copyright
Copyright © Cambridge University Press 1917

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