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Narsarsukite: a new occurrence in peralkaline trachyte, south Greenland

Published online by Cambridge University Press:  05 July 2018

B. G. J. Upton ,
R. Macdonald ,
P. G. Hill ,
B. Jefferies  and
C. E. Ford
B. G. J. Upton
Affiliation:
Department of Geology, Edinburgh, EH9 3JW
R. Macdonald
Affiliation:
Department of Environmental Sciences, Lancaster, LAI 4YR
P. G. Hill
Affiliation:
Department of Geology, Edinburgh, EH9 3JW
B. Jefferies
Affiliation:
Department of Geology, Edinburgh, EH9 3JW
C. E. Ford
Affiliation:
Department of Geology, Edinburgh, EH9 3JW
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Summary

A flinty, spherulitic dyke of peralkaiine trachyte in a Precambrian dyke-swarm consists mainly of albite and aegirine. Within this, euhedral crystals of narsarsukite, Na2(Ti,Fe)Si4O10(F), occur as short prisms elongate parallel to c. This distinguishes them from all previously described narsarsukites, which have tabular habits. Minor phases present include micas, apatite, quartz, pectolite, nordite, and a thorium silicate. Probe analyses are presented for narsarsukite, aegirine, aibite, biotite, apatite, pectolite, nordite, and the thorium silicate.

On mineralogical and geochemical grounds it is unlikely that the narsarsukite-bearing dyke is a differentiate of supposedly mantle-derived basalt-trachyte-comendite magmas in the region. The dyke is colinear with a comendite dyke exposed at lower altitude and it is suggested that the narsarsukite- bearing dyke developed as a rhcomorphic fenite generated by reaction between quartz diorite basement and fugitive alkaline solutions from the subjacent comendite.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 315 , September 1976 , pp. 737 - 746
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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