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III.—An Irish Augitite

Published online by Cambridge University Press:  01 May 2009

Bernard Hobson
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Extract

When writing my paper “On the Igneous Rocks of the South of the Isle of Man,” I was led to compare a Manx melaphyre, from Scarlet Point, with a rock described by Prof. E. Hull as a melaphyre, occurring at Ballytrasna, near Limerick, and belonging to the “Upper Trap-band,” a little below the basal shales of the Coal-measures. Through the kindness of Prof. Hull, a chip of the rock was sent to me by the Irish Geological Survey. The specimen was black and basaltic-looking. I did not obtain satisfactory sections of it in time for my paper, but have since had excellent ones made. On examining them I was immediately struck by the resemblance of the rock to the augitite of Paschkapole, between Velmin and Boreslau, in Bohemia, with a section of which I compared it. Professor Hull describes the rock of Ballytrasna as containing “numerous large crystals and groups of banded felspar”; but I failed to find a single felspar in four sections, nor did I observe any in Allport's section, No. 1902, from the same locality, which agrees with my sections.

Type
Original Articles
Information
Geological Magazine , Volume 9 , Issue 8 , August 1892 , pp. 348 - 350
Copyright
Copyright © Cambridge University Press 1892

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References

page 348 note 1 See paper by Prof. Nicholson and Mr. Marr, with Appendix; Quart. Journ. Geol. Soc. vol. xlvii. pp. 512–514 (1891).Google Scholar

page 348 note 2 Plate 71, fig.

page 348 note 3 Quart. Journ. Geol. Soc. vol. xlvii. (1891), pp. 432–450 (reprinted with additions in Yn Lioar Manninagh, 1892, pp. 337–348).Google Scholar

page 348 note 4 “On the Microscopic Structure of the Limerick Carboniferous Trap Eocks,” GEOL. MAG. 1873 (pp. 153–161), p. 157. Prof. Hull gives a list of papers relating to the geology of these rocks.Google Scholar

page 348 note 5 Mentioned by Eosenbusch, H., Mikroskopische Physiographie der Massigen Gesteine (1887), p. 821.Google Scholar

page 349 note 1 Loc. cit. p. 157.Google Scholar

page 349 note 2 In the British Museum (Natural History).

page 349 note 3 Op. at. pp. 339–340.Google Scholar

page 349 note 4 Term proposed by Iddings, J. P., “On the Crystallization of Igneous Rocks,” Phil. Soc. Washington Bulletin, vol. xi. (1889), p. 73, for “porphyritic constituents” in Rosenbusch's sense.Google Scholar

page 349 note 5 On the Microscopic Structure and Composition of British Carboniferous Dolerites, Quart. Journ. Geol. Soc. vol. xxx. (1874), pp. 529–567.Google Scholar