How Does Dunite Form?
Dunite Occurs in Layered, Gabbroic Igneous Complexes (See Gabbro). It Probably Forms from the Accumulation of Dense, Early Crystallizing Grains of Olivine That...
Dunite occurs in layered, gabbroic igneous complexes (see gabbro). It probably forms from the accumulation of dense, early crystallizing grains of olivine that sink to the bottom of low silica magma. Intrusions of dunite form sills or dikes. Some dunite has been altered to form serpentine.
What layer does dunite come from?
Dunite is the olivine-rich endmember of the peridotite group of mantle-derived rocks. Dunite and other peridotite rocks are considered the major constituents of the Earth's mantle above a depth of about 400 km (250 mi).
How is dunite extracted?
Dunite forms either as a cumulate within layered intrusions or as a residue after extraction of partial melt from a pre-existing ultrabasic rock in the mantle. ... It is also found in alpine peridotite massifs that represent slivers of sub-continental mantle exposed during collisional orogeny.
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