Post-cumulus disruption of the Lilloise Intrusion, East Greenland

• Published in: Geological Magazine
• Main Author: Matthews, D. W.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1976
• Subjects: Geology; Greenland; East Greenland
• Online Access: http://dx.doi.org/10.1017/s0016756800043272; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800043272

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.