How To Use Peridotite In A Sentence
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Diamonds sometimes contain minute inclusions of the minerals garnet, olivine, and pyroxene, which indicate formation in two major mantle rock-types, peridotite and eclogite.
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They comprise at least six large bodies which range in composition from peridotite cumulates through gabbros and norites to syenites, although the full compositional spectrum is not present in each intrusion.
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The spinels have low Mg number in comparison with Alpine-type peridotites, suggesting hydrothermal alteration in which Cr is preferentially retained in spinel.
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Enstatite occurs in plutonic basic and ultrabasic rocks such as peridotite and norite, and also in some high-grade metamorphic rocks.
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Field relations also rule out a direct genetic link between mantle peridotites and upper crustal rocks exposed on the island.
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The trace elements analysis shows that limburgite is the product of partially melting of mantle peridotite and diagenesis did not undergo the crustal contamination.
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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.
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Besides the dyke swarms, the northern section is composed mainly of serpentinised peridotite and gabbro masses, although there are small areas of extrusive volcanic rocks.
MacQuarie Island, Australia
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The basalt, inferred to be of Miocene age, appears to be an alkali basalt that contains xenoliths of ultramafic rocks (peridotite and pyroxenite) up to a few centimeters in size.
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The mantle is thought to be made up mostly of peridotite, a type of rock composed of iron, magnesium, silicon, and oxygen.
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The original home of platinum is in basic igneous rocks, such as peridotites, pyroxenites, and dunites, where it has been found in small, scattered crystals intergrown with olivine, pyroxene, and chromite.
The Economic Aspect of Geology
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The resulting rock, called serpentinite, has a much lower density than the original peridotite, thereby increasing the relative buoyancy of the future ophiolite - and with this its chances of obduction.
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Beneath continents, the Serpentosphere is mainly composed of antigorite alpine peridotite/serpentinite and may be several kilometers thick.
At it Again
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The magma contains components of the sediments and weathered oceanic crust from the Nazca plate as well as the peridotite in the mantle beneath South America.
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Field observations show that the gabbroperidotite section had already cooled to amphibolite - to greenschist-facies conditions when the dykes intruded.
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Beneath continents, the Serpentosphere is mainly composed of antigorite alpine peridotite/serpentinite and may be several kilometers thick.
At it Again
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It is clear nevertheless that transforms are sites where deep-seated rocks, such as serpentinized peridotite (derived from the upper mantle), are relatively common.
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Dolerite dykes that cut the peridotite show chilled margins and local metasomatic calcic alteration.
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C peridotite and dunite the upper mantle is composed of ultramafic rock called peridotite which is mostly olivines and pyroxenes.
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The enclaves in the mentioned basaltoids represent peridotites, pyroxenites and gabbroid rocks.
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The formation and preservation of the peridotite mylonite in particular presents problems of interpretation.
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Beneath ocean basins and adjacent to spreading centers, oceanic Serpentosphere is continuously generated by the interactions of deep circulating marine composition water – partly in super-critical state –with harzburgitic peridotite in a process referred to as serpentinization.
At it Again
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Enstatite occurs in plutonic basic and ultrabasic rocks such as peridotite and norite, and also in some high-grade metamorphic rocks.
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The intellectual and creative processes by which we improve infrastructural code are no less natural than the geological forces that turn granite into gneiss, limestone into marble and peridotite into serpentine.
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The intellectual and creative processes by which we improve infrastructural code are no less natural than the geological forces that turn granite into gneiss, limestone into marble and peridotite into serpentine.
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Type I peridotites are interpreted to be the residua remaining after extraction of a partial melt.
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Such rocks are important in defining ages for crustal rocks underlying the peridotite.
