What type of metamorphic rock is eclogite?

Eclogite is a metamorphic rock consisting of pyroxene omphacite and pyrope-rich garnet. It is a rare but geologically significant rock type. It is common in the upper mantle, especially in regions occupied by subducted oceanic plates.

Is eclogite a metamorphic rock?

eclogite, any member of a small group of igneous and metamorphic rocks whose composition is similar to that of basalt. Eclogites consist primarily of green pyroxene (omphacite) and red garnet (pyrope), with small amounts of various other stable minerals—e.g., rutile.

What rocks form in retrograde metamorphism?

Winkler (1967) has suggested that burial of volcanic rocks intercalated with sediments may result in retrograde metamorphism of the volcanic rocks at the same time as the sedimentary rocks are being progressively metamorphosed….Retrograde metamorphic reactions.

Is eclogite high metamorphic grade?

Eclogite is an attractive, uncommon, crystalline-textured, very high-grade metamorphic rock. It is dominated by green & red minerals. The red is pyrope or almandine garnet. The green is omphacite pyroxene.

What is prograde and retrograde metamorphism?

In metamorphic rock: Retrograde metamorphism. In general, the changes in mineral assemblage and mineral composition that occur during burial and heating are referred to as prograde metamorphism, whereas those that occur during uplift and cooling of a rock represent retrograde metamorphism.

What is prograde metamorphism of pelitic rocks?

Progressive or prograde metamorphism occurs as the temperature and pressure are increased on the rock. Pelitic and quartzo-feldspathic rocks are relatively aluminous, calcareous rocks are relatively rich in the C component, and basic rocks are relative rich in the F component.