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The mineral paragenesis and metamorphic status of garnet-hornblende-pyroxene-scapolite gneiss from Ghana (Gold Coast)

Published online by Cambridge University Press:  14 March 2018

O. von Knorring  and
W. Q. Kennedy
O. von Knorring
Affiliation:
Dept. of Geology, University of Leeds
W. Q. Kennedy
Affiliation:
Dept. of Geology, University of Leeds
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Summary

The main minerals (garnet, pyroxene, hornblende, and scapolite) in certain Dahomeyan (Archaean) garnet-hornblende-pyroxene-scapolite gneisses from Ghana have been separated and analysed. Both the garnet and the pyroxene show marked eclogitic affinities, and the rocks are considered to occupy a transitional position between the amphibolite and eclogite facies. The scapolite is a sulphatic variety containing more than 4 % SO3 and is believed to be a product of autometasomatism. A revised scheme for the distribution of mineral facies within the temperature-pressure field of metamorphism is proposed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 241 , June 1958 , pp. 846 - 859
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1958

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