DEFINITION OF GRANULITE

A coarse-grained metamorphic rock formed at

high temperatures and pressures. Granulites generally lack a

strong foliation because dehydration reactions remove micas

and other hydrous minerals that are platy, and typically

define the foliation in other metamorphic rocks. Many types

of granulite (such as charnockites) are orthopyroxene-bearing,

with large orthopyroxene grains typically overgrowing

older primary minerals.

The origin of granulites has been controversial, with

abundant evidence indicating that they are residual rocks that

have experienced incipient partial melting, and other evidence

indicating that the rocks have been permeated by carbondioxide–

rich fluids during high temperature–high pressure

metamorphism.

See also METAMORPHISM.

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