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Kaersutite-bearing gabbroic inclusions and the late dike swarm of Kangerdlugssuaq, East Greenland

Published online by Cambridge University Press:  05 July 2018

C. Kent Brooks  and
R. G. Platt
C. Kent Brooks
Affiliation:
Institute of Petrology, University of Copenhagen
R. G. Platt
Affiliation:
Grant Institute of Geology, University of Edinburgh
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Summary

The Kangerdlugssuaq late dike swarm, which strikes at a high angle to the well-known East Greenland coastal swarm, is described and chemical analyses presented. The basic members are characterized by a high potassium content. A variety of kaersutite-bearing gabbroic inclusions in one member of this swarm is described in detail and microprobe analyses of clinopyroxenes, amphiboles, plagioclases, sheet silicates, and spinel minerals are presented. On the basis of this evidence it is deduced that these inclusions derive from a cumulate sequence formed at depths of between 5 and 10 km beneath the Lower Tertiary land surface. It is likely that fractionation of such assemblages causes a transition, at relatively low pressure, from undersaturated to oversaturated compositions, but the products appear to be quantitatively minor.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 311 , September 1975 , pp. 259 - 283
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1975

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Footnotes

1

Present address: Dept. of Geology, Lakehead University, Thunder Bay, Ontario, Canada

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