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Zoning in plagioclase felspar

Published online by Cambridge University Press:  14 March 2018

James Phemister
James Phemister*
Affiliation:
H.M. Geological Survey
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Extract

During the examination of the basalts of Calciferous Sandstone age which are mapped on the one-inch Sheet 23 (Hamilton, Lanarkshire) Scotland, the peculiarities of zoning exhibited by the porphyritic felspar were studied in some detail. As only a summary of the details is possible in the memoir explanatory of the geology of this Sheet, the description of the zoning is offered here, and some conclusions regarding the magmatic history of the zoned felspars are presented.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 23 , Issue 145 , June 1934 , pp. 541 - 555
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1934

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References

page 542 note 1 The numbers refer to registered slices in the Geological Survey Collection of Scottish rocks.

page 544 note 1 Compare Bowen, N. L. , The evolution of the igneous rocks. Princeton, 1928, Chap. xvi and p. 289 Google Scholar

page 547 note 1 Duparc, L. and Rcinhard, M., La determination des plagioclases darts les coupes minces. Mem. Soc. Phys. Hist. :Nat. Genbve, 1924, vol. 40, p. 32. [M.A. 3-34.]Google Scholar

page 547 note 2 According to C. Harloff (Zonal structure in plagioclases. Leidsche Geol. Mededeel., 1927, vol. 2, p. 111) it is not possible to obtain the exact percentages of anorthite in the minute zones of oscillatory-zoned plagioclase by this method, and the compositions shown in the diagram must be regarded as approximations.

page 547 note 3 Homma, F., Über das Ergebnis yon Messungen an zonaren Plagioklasen aus Andesiten. Schweiz. Min. Petr. Mitt., 1932, vol. 12, pp. 345-352. [M.A. 5-436.]Google Scholar

Paliuc, G., Untersuchungen der Plagioklase einiger tertiärer Ergussgesteine Siebenbiirgens (Rum~nicn). Ibid., 1932, vol. 12, 423-444. [M.A. 5.]Google Scholar

Ghika-Budesti, S., Les plagioclases des banatites. Ibid., 1931, vol. 11, pp. 12-26.Google Scholar [M.A. 5-436.]

page 548 note 1 Harker, A., Natural history of igneous rocks. London, 1909, p. 232.Google Scholar

page 551 note 1 Iddings, J. P., Igneous rocks. New York, 1909, vol. 1, p. 177.Google Scholar

page 551 note 2 Fenner, C. N., The Katmai magmatie province. Journ. Geol. Chicago, 1926, vol. 34, pp. 700-703.Google Scholar

page 554 note 1 Registered rock slices in the Geological Survey collection of Scottish rocks