释义 |
Definition of dunite in English: dunitenounˈdʌnʌɪtˈdənīt mass nounGeology A green to brownish coarse-grained igneous rock consisting largely of olivine. Example sentencesExamples - In the field, the boundary between crustal units and mantle units is marked by a zone of sheared serpentinite, which overlies more massive largely serpentinized, harzburgite and dunite.
- Its lower part displays alternating bands of peridotite, pyroxenite, and dunite, but dunite is dominant throughout most (and especially the upper part) of the unit.
- It comprises massive websterites and clinopyroxenites, usually interlayered with relatively subordinate dunite.
- The lowermost rocks are serpentinized dunite and harzburgite, which are best exposed in the NE of the ophiolite.
- Stratigraphically from bottom to top it is composed of sheared serpentinite on the basal thrust, layered harzburgitedunite, layered dunite with chromitite, and harzburgite with finegrained gabbro.
Origin Mid 19th century: from the name of Dun Mountain, New Zealand, + -ite1. Definition of dunite in US English: dunitenounˈdənīt Geology A green to brownish coarse-grained igneous rock consisting largely of olivine. Example sentencesExamples - Stratigraphically from bottom to top it is composed of sheared serpentinite on the basal thrust, layered harzburgitedunite, layered dunite with chromitite, and harzburgite with finegrained gabbro.
- In the field, the boundary between crustal units and mantle units is marked by a zone of sheared serpentinite, which overlies more massive largely serpentinized, harzburgite and dunite.
- It comprises massive websterites and clinopyroxenites, usually interlayered with relatively subordinate dunite.
- The lowermost rocks are serpentinized dunite and harzburgite, which are best exposed in the NE of the ophiolite.
- Its lower part displays alternating bands of peridotite, pyroxenite, and dunite, but dunite is dominant throughout most (and especially the upper part) of the unit.
Origin Mid 19th century: from the name of Dun Mountain, New Zealand, + -ite. |