ECLOGITE from GLENELG (Scotland) dated 1.08Ga - Linked to the Grenville Orogeny

Description

ECLOGITE
The fresh rock can be striking in appearance, with red to pink garnet (almandine-pyrope) in a green matrix of sodium-rich pyroxene (omphacite).
Eclogite typically results from high-pressure metamorphism of mafic igneous rock (typically basalt or gabbro) as it plunges into the mantle in a subduction zone.
Eclogite
Glenelg, Scotland
(close to the Eilean Donan castle)
Metamorphic
Mafic (Fe,Mg-rich)
Specimen is a 2.14g endcut
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Glenelg is the only
eclogite !
Sm–Nd mineral–whole-rock dates
for Glenelg eclogite
indicated that peak eclogite-facies metamorphism occurred around c.
1.08 Ga, which was correlated with the Grenvillian orogeny.
The Grenville orogeny was a long-lived Mesoproterozoic
mountain-building event associated with the assembly of the supercontinent Rodinia
. Its record is a prominent orogenic belt which spans a significant portion of the North American continent, from Labrador to Mexico, as well as to Scotland, which was geographically close at this time... and situated on south hemisphere !
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