Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-23T16:17:29.468Z Has data issue: false hasContentIssue false
  • English
  • Français

Origin of the White Allivalite, Western Cuillin, Isle of Skye

Published online by Cambridge University Press:  01 May 2009

Robert Hutchison
Robert Hutchison
Affiliation:
Department of Earth Sciences, The University, Leeds 2.
Get access Rights & Permissions [Opens in a new window]

Summary

Tholeiitic contact rocks and a wide zone (White Allivalite) rich in primary precipitate calcic plagioclase are marginal to a layered allivalite series in a funnel-shaped intrusion. The high structural level apparently precludes the possibility that the ultrabasic layered rocks are the basal part of an accumulate from a tholeiitic magma. It is suggested, therefore, that a suspension of calcic plagioclase in a liquid more basic than basalt gave rise to an approximately equal volume of layered ultrabasic rocks by fractional crystallization. Emplacement was probably initiated as a tholeiitic cone-sheet complex, followed by the injection of the ultrabasic suspension in a volume sufficiently large to form a funnel-shaped body within the cone-sheet complex.

Type
Articles
Information
Geological Magazine , Volume 105 , Issue 4 , August 1968 , pp. 338 - 347
Copyright
Copyright © Cambridge University Press 1968

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Anderson, F. W. & Dunham, K. C. 1966. The geology of northern Skye. Mem. geol. Surv. U.K.Google Scholar
Black, G. P. 1954. The significance of tridymite in igneous and metamorphic petrogenesis. Miner. Mag., 30, 518–524.Google Scholar
Brown, G. M. 1957. The layered ultrabasic rocks of Rhum, Inner Hebrides. Phil. Trans. R. Soc., B, 240, 3–52.Google Scholar
Brown, G. M. 1963. Melting relations of tertiary granitic rocks in Skye and Rhum. Miner. Mag., 33, 533–562.Google Scholar
Deer, W. A., Howie, R. A. & Zussman, J. 1963. Rock forming minerals, 4. London: Longmans.Google Scholar
Drever, H. I. & Johnston, R. 1966. A natural high-lime silicate liquid more basic than basalt. J. Petrol., 7, 414–420.CrossRefGoogle Scholar
Harker, A. 1904. The tertiary igneous rocks of Skye. Mem. geol. Surv. U.K.Google Scholar
Hutchison, R. 1966. Intrusive tholeiites of the western Cuillin, Isle of Syke. Geol. Mag., 103, 352–363.CrossRefGoogle Scholar
Wager, L. R. 1956. A chemical definition of fractionation stages as a basis for comparison of Hawaiian, Hebridean, and other basic lavas. Geochim. Cosmochim. Acta, 9, 217–248.CrossRefGoogle Scholar
Wager, L. R. & Brown, G. M. 1957. Funnel-shaped layered intrusions. Bull. geol. Soc. Am., 68, 1071–4.CrossRefGoogle Scholar
Wager, L. R. & Deer, W. A. 1939. Geological investigations in East Greenland. Part III, The petrology of the Skaergaard intrusion, Kangerdlugssuag. Medd. om. Grønland, 105, No. 4, 1–352.Google Scholar
Weedon, D. S. 1961. Basic igneous rocks of the southern Cuillin, Isle of Skye. Trans. geol. Soc. Glasgow, 24, 190–212.Google Scholar
Weedon, D. S. 1965. The layered ultrabasic rocks of Sgurr Dubh, Isle of Skye. Scot. J. Geol., 1, 41–68.CrossRefGoogle Scholar