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Trachy-ophitic texture in Carboniferous basalts

Published online by Cambridge University Press:  14 March 2018

R. B. Elliott
R. B. Elliott*
Affiliation:
Department of Geology, University of Nottingham
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Extract

Many Jedburgh-type olivine-basalts of Carboniferous age in Scotland are characterized by a sub-ophitic texture in their groundmass and a flow structure of their lathy felspar phenoerysts. These characteristics have been frequently reported in the writings of Geikie, Flett, Bailey, Tyrrell, MacGregor, and others and are recognized as important textural features. In the main, however, they have been described as independent features and have been regarded as unrelated phenomena. Tyrrell (1909) alone has remarked on parallel felspars enclosed in plates of augite, and since his description appeared at an early date and has been available to subsequent workers, the lack of further examples indicates either that his discovery has been overlooked or that the texture is very rare.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 218 , September 1952 , pp. 925 - 928
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1952

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References

page 925 note 1 McRobert, R. W., Igneous rocks of Teviot and Liddesdale. Trans. Edinburgh Geol. Soc., 1920, vol. 11, pp. 86–103. [M.A. 1–92.]Google Scholar

page 928 note 1 Daly, R. A. and Barth, T. F. W., Dolerites associated with the Karroo system, South Africa. Geol. Mag., 1930, vol. 67, pp. 97–110 Google Scholar.

page 928 note 2 Tyrrell, G. W., The petrology of the Auchinedeu district, Kilpatrick Hills. Trans. Geol. Soc. Glasgow, 1909, vol. 13, pp. 337–343 Google Scholar.

page 928 note 3 Krokström, T., On the ophitic texture and order of crystallization in basaltic magma. Bull. Geol. Inst. Univ. Upsala, 1932, vol. 24, pp. 197–216 Google Scholar.