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Post-cumulus disruption of the Lilloise Intrusion, East Greenland

Published online by Cambridge University Press:  01 May 2009

D. W. Matthews
D. W. Matthews
Affiliation:
Department of Mineralogy and Petrology, Downing Place, Cambridge
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Summary

Field, petrographic and chemical evidence from the cumulates of western Lilloise suggest a substantially higher level of exposure in the cumulus pile than is seen on the E side, due to relative subsistence of the western half of the intrusion. It is suggested that the subsistence started while both cumulus pile and the surrounding basalts were still hot and not fully consolidated. When, later, reactivation occurred, the rocks were in a more cohesive state and ‘syenitic’ magma was available for intrusion as discrete sheets and veins.

Type
Articles
Information
Geological Magazine , Volume 113 , Issue 3 , May 1976 , pp. 287 - 296
Copyright
Copyright © Cambridge University Press 1976

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References

Brooks, C. K. 1973. The Tertiary of Greenland: a volcanic and plutonic record of continental break-up. Mem. Ass. Petrol. Geol. 19, 150–60.Google Scholar
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Brown, P. E. 1973. A layered plutonic complex of alkali basalt parentage: the Lilloise intrusion, East Greenland. J. geol. Soc. Lond. 129, 405–18.CrossRefGoogle Scholar
Wager, L. R. 1934. Geological investigations in East Greenland. I. General geology from Angmagssalik to Kap Dalton. Meddr Grønland 105, 1–46.Google Scholar