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On the Differentiation of the Glen More Ring-dyke, Mull

Published online by Cambridge University Press:  01 May 2009

Cath Koomans  and
Ph. H. Kuenen
Cath Koomans
Affiliation:
University of Leyden
Ph. H. Kuenen
Affiliation:
University of Groningen.
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Summary

New analyses are given of the Glen More Ring-dyke. The basic end of the variation diagram is found to differ considerably from that of the Normal Magma Series. The magma variation is explained by gravitative sinking of augite and iron-ore (and plagioclase), the olivine of the Normal Series playing only a subordinate part. Various objections are brought forward to the explanation of the magmas by hybridization. The peculiar microscopic aspect of the intermediate rocks is tentatively attributed to pneumatolytic emanations from the lower reaches of the column. It is shown that a gradual transition from basic to acid already existed before the final consolidation of the magma took place.

Type
Original Articles
Information
Geological Magazine , Volume 75 , Issue 4 , April 1938 , pp. 145 - 160
Copyright
Copyright © Cambridge University Press 1938

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References

BIBLIOGRAPHY

(1)“Tertiary and Post-Tertiary geology of Mull, etc.” Mem. Geol. Surv., Scotland, 1924.Google Scholar
(2)Holmes, A., and Harwood, H. F., “The age and composition of the Whin Sill and the related dykes of the north of England,” Min. Mag., xxi, 1928, 493–542.Google Scholar
(3)Holmes, A., and Harwood, H. F., “The tholeiite dykes of the north of England,” Min. Mag., xxii, 1929, 1–52.Google Scholar
(4)“The Geology of Ardnamurchan, etc,” Mem. Geol. Surv., Scotland, 1930.Google Scholar
(5)Niggli, P., and Lombaard, B., “Das Bushveld als petrographische Provinz,” Schweiz. Min. u. Petr. Mitt., xii, 1933, 110–186.Google Scholar
(6)Nockolds, S. R., “The Production of Normal Rock Types by Contamination and their bearing on Petrogenesis,” GEOL. MAG., LXXI, 1934, 31–9.Google Scholar
(7)Holmes, A., “The Idea of Contrasted Differentiation,” Geol. Mag., LXXIII, 1936, 228–238; Ibid., LXXIV, 1937, 189–191.Google Scholar
(8)Nockolds, S. R., “The Idea of Contrasted Differentiation: A Reply,” Geol. Mag., LXXIII, 1936, 529–535.Google Scholar
(9)Reynolds, Doris L., “Demonstrations in petrogenesis from Kiloran Bay, Colonsay: I. The transfusion of quartzite,” Min. Mag., xxiv, 1936, 367–407.Google Scholar
(10)Fenner, C. N., “A view of magmatic differentiation,” Journ. Geol., xlv, 1937, 158–168.Google Scholar