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Autometasomatic alteration of gabbro, Kap Edvard Holm intrusive complex, East Greenland

Published online by Cambridge University Press:  05 July 2018

R. Elsdon
R. Elsdon*
Affiliation:
Department of Geology, University College, Dublin 4, Ireland
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Abstract

A local area of the Kap Edvard Holm Upper Layered Series gabbro has been converted into a quartz-albite-epidote ilmenite rock by leaching of iron and with a net mass loss. Among the textural changes is the dissolution of the magnetite matrix of magnetite-ilmenite lamellar intergrowths. This is an extreme example of a series of low-temperature changes occurring throughout the intrusion due to the reaction of the gabbro with a volatile-rich phase which separated during the magmatic stage and remained trapped within the walls of the intrusion. The Fe-rich fluid formed by this autometasomatic process is similar to those responsible for the genesis of Cornwall-type magnetite deposits. The probable temperature range for the process is 400–550°C.

Type
Research Article
Information
Mineralogical Magazine , Volume 45 , Issue 337 , 1982 , pp. 219 - 225
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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