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Undersaturated Potassic Lavas and Hypabyssal Intrusives in North Johore

Published online by Cambridge University Press:  01 May 2009

P. L. C. Grubb
P. L. C. Grubb
Affiliation:
C.S.I.R.O. Mineragraphic Investigations Section, c/o University, Parkville, N.Z., Victoria, Australia
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Abstract

An interesting occurrence of highly potassic lavas and hypabyssal intrusives of assumed Tertiary age is described from North Johore. The thickest lava flow is gravitatively differentiated showing a basal horizon of potassic ankaramite and basanite grading up into highly potassic bolitized flow tops of leucite-tephrite composition. Evidently the parent magma was close to a biotite pyroxenite in composition and possibly an assimilation product of peridotite by granite.

Type
Articles
Information
Geological Magazine , Volume 102 , Issue 4 , August 1965 , pp. 338 - 346
Copyright
Copyright © Cambridge University Press 1965

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References

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