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Mineral reactions at a peridotite-gneiss contact, Jotunheimen, Norway

Published online by Cambridge University Press:  05 July 2018

W. L. Griffin
W. L. Griffin*
Affiliation:
Mineralogisk-Geologisk Museum, Oslo
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Summary

The assemblage aluminous pyroxenes+ spinel forms reaction zones between olivine-rich and plagioclase-rich layers in the Jotunheimen complex. These zones have probably formed by cooling from high T at moderate P, passing through the ol + plag → pyroxenes + spinel reaction. The absence of garnet, which would be expected to form upon further cooling, is attributed to interruption of the cooling history by rapid uplift. This uplift is demonstrated by symplectitic breakdown of aluminous pyroxenes, with expulsion of Ts and Acm, to yield low-Al pyroxenes, spinel, and plagioclase. The uplift must be Precambrian, and suggests that the Jotun rocks were involved in rapid vertical movements long before the Caledonian thrusting took place.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 296 , December 1971 , pp. 435 - 445
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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Footnotes

1

Publication no. 27 in the Norwegian Geotraverse Project.

2

Present address: Institut for Geologi, Blindern, Oslo.

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