Examples of eclogite

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The preservation of abundant igneous plagioclase, however, indicates that the body largely failed to equilibrate at eclogite-facies conditions.
In some cases it is ambiguous, however, whether these porphyroclastic assemblages represent remnants of a granulite-facies assemblage or an eclogite-facies assemblage.
The eclogite sheets and pods are generally sheared and retrogressed to amphibolites at the margins of such bodies.
Therefore, granulite-facies assemblages would indicate metastability at high pressures if they pre-dated eclogite-facies metamorphism.
In larger (> 10 m) mafic bodies, however, several 'fresh' eclogite zones occur, separated by a network of amphibolitefacies alteration and shear zones.
All felsic gneisses, where unaffected by subsequent eclogite or amphibolite-facies metamorphism, show evidence for granulite-facies equilibration.
The layering and amphibolite-facies foliation of the enclosing gneisses commonly wraps eclogite pods, truncating eclogite-facies structures.
Sanders (1988) also reported titanite as a product of a high-pressure excursion within the eclogite facies in samples that he studied.
In terms of timing of eclogite facies metamorphism and retrogression, two studies are pertinent.
Figure 2 displays a steep decompression path, which is consistent with rapid exhumation of eclogite, which is also implied by the presence of the symplectites.
Pegmatites occur in boudin necks, in curved fractures within the eclogite and on the margin of the body.
We describe the spatial and temporal relationships between the different assemblages and structures that show that the granulite-facies assemblages pre-date the eclogite-facies metamorphism.
The undeformed state of these bodies may indicate that these bodies also behaved metastably under eclogite-facies conditions.
There is a continuous petrographic range from essentially anhydrous eclogite to a blueschist metabasite with garnet and sodic amphibole but no omphacite.
The eclogite is best preserved in the interiors of thick sheets and/or pods.

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