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V.—Notes on the Wicklow Greenstones

Published online by Cambridge University Press:  01 May 2009

Frederick H. Hatch
Frederick H. Hatch
Affiliation:
28, Jermyn Street, S.W.
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Extract

The Wicklow greenstones occur in sheets and dykes intrusive in the Lower Silurian slates (the equivalent of the Bala beds of Wales) that lie to the east of the main chain of the Leinster granite. Like the Welsh greenstones, they are associated with acid lavas (felsites and keratophyres) and felspathie tuffs, although of slightly later origin than these.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 6 , June 1889 , pp. 261 - 265
Copyright
Copyright © Cambridge University Press 1889

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References

page 261 note 1 Professor Haughton gave a brief description, with two analyses, of the Westaston greenstone as early as 1859 (Trans. Roy. Irish Acad. vol. xxiii. p. 619Google Scholar); but I am referring to microscopical work.

page 261 note 2 “Petrographische Skizzen aus Irland,” Tschermak's Min. u. Pet. Mitth. vol. i. 1878, p. 441.Google Scholar

page 261 note 3 1888, pp. 249 and 266.

page 264 note 1 According to Mr.Hutchings, W. M. (this Magazine for February, 1889, p. 53Google Scholar) the same error has been committed in Cornwall, De la Beche having held certain “schistose trappean rocks,” which Mr. Hutchings has proved to be mechanically metamorphosed greenstones,” for altered ash.

page 264 note 2 Similar alterations are described by Mr. Hutchings in the Tintagel rock (loc. cit.), and by Mr. Teall in a greenstone occurring at Garth near Portmadoc (Brit. Petrog. p. 216).