Imperial College Rock Library

Glossary: Wehrlite

    A wehrlite is an ultrabasic igneous rock dominated by essential olivine and clinopyroxene with or without small amounts of orthopyroxene. Accessory minerals include plagioclase, spinel, garnet, ilmenite, chromite and magnetite. Wehrlites are a peridotites and a minor component of the upper mantle where they form due to crystallisation of partial melts. Wehrlite occurs as mantle xenoliths within mantle-derived magmas and within the upper portions of the mantle sequence of ophiolites. It can occur in both xenoliths and ophiolites as veins and dykes. Wehrlite can also form as cumulates within layered intrusions associated with gabbro and norite.

Related Terms

ultrabasic rock, peridotite, ultrabasic rock, cumulate, gabbro, norite, mantle xenolith