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Titaniferous clinohumite from Gardiner Plateau Complex, East Greenland

Published online by Cambridge University Press:  05 July 2018

T. F. D. Nielsen  and
O. Johnsen
T. F. D. Nielsen
Affiliation:
Institute of Petrology and Geological Museum, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen K, Denmark
O. Johnsen
Affiliation:
Institute of Petrology and Geological Museum, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen K, Denmark
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Summary

Titaniferous clinohumite occurs as a major constituent in the centres of late magmatic veins in the Tertiary ultramafic, strongly alkaline Gardiner Plateau Complex in East Greenland (69° N. and 32° W.). The complex is briefly described and an electron microprobe analysis of titaniferous clinohumite is presented. This gives the following: 38·44% SiO2, 2·99% TiO2, 4·87% FeO, 51·89% MgO, 1·3% F, H2Ocalc 1·50%, and total 100·44%. Optical data, density, and unit cell dimensions are also presented. Of magmatic occurrences, titaniferous clinohumite has otherwise only been reported in certain kimberlites and carbonatites.

Type
Research Article
Information
Mineralogical Magazine , Volume 42 , Issue 321 , March 1978 , pp. 99 - 101
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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