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单词 dunite
释义

Definition of dunite in English:

dunite

nounˈdʌnʌɪtˈdənīt
mass nounGeology
  • A green to brownish coarse-grained igneous rock consisting largely of olivine.

    〔地质〕纯橄榄岩

    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:

dunite

nounˈdənīt
Geology
  • A green to brownish coarse-grained igneous rock consisting largely of olivine.

    〔地质〕纯橄榄岩

    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.

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更新时间:2024/10/19 14:27:50