DEFINITION OF PERIDOTITE

A coarse-grained ultramafic igneous plutonic

rock characterized by abundant olivine, plus lesser quantities

of orthopyroxene, clinopyroxene, amphibole, and micas,

with little or no feldspar. The term peridotite is a general

term for many narrowly defined ultramafic rock compositions

including harzburgite, lherzolite, websterite, wehrlite,

dunite, and pyroxenite. Peridotites are not common in the

continental crust but are common in the lower cumulate section

of ophiolites, in the mantle, and in continental layered

intrusions and ultramafic dikes. Peridotites have unstable

compositions under shallow crustal metamorphic conditions,

and in the presence of shallow surface hydrating weathering

conditions, and commonly become altered to serpentinites

through the addition of water to the mineral structures.

See also IGNEOUS ROCKS.

Title Post:
Rating: 100% based on 99998 ratings. 99 user reviews.
Author:

Terimakasih sudah berkunjung di blog SELAPUTS, Jika ada kritik dan saran silahkan tinggalkan komentar