M23. Garnet clinopyroxene plagioclase granulite
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Fact sheet
Description: 

This garnet-clinopyroxene-plagioclase granulite comes from Slishwood in the northeastern end of the Ox Mountains inlier, a belt of extremely high-grade metasediments and metabasites whose age is uncertain. The rocks survive widespread Grampian epidote amphibolite facies retrograde alteration.  Conditions of the metamorphism were transitional between the granulite facies and the eclogite facies, and have been dubbed the high-pressure granulite facies.  The unusal intergrowth of clinopyroxene and plagioclase in the rock perhaps resulted from decompression of former sodium-aluminium-rich clinopyroxene (called omphacite) and, if so, then the rock was once eclogite.

In Place
In Time
Location description: 
Slishwood, Northeast Ox Mountains, Co. Sligo, Ireland
Accuracy:
Timescale:
Timescale: 
Proterozoic
Ma = Millions of years ago
In Focus
Type:
Type: 
metamorphic
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