A Re—Os isotope study of ultramafic xenoliths from the Matsoku kimberlite
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Keywords:
Metasomatism
Peridotite
Xenolith
Phlogopite
Ultramafic rock
Infiltration (HVAC)
Xenolith
Phlogopite
Lapilli
Diatreme
Country rock
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Metasomatism
Peridotite
Phlogopite
Xenolith
Trace element
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Peridotite
Xenolith
Metasomatism
Chromite
Phlogopite
Carbonatite
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Peridotite
Xenolith
Metasomatism
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Diatreme
Phlogopite
Xenolith
Breccia
Phenocryst
Ultramafic rock
Mineral redox buffer
Diopside
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Phlogopite
Xenolith
Lapilli
Diatreme
Country rock
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Phlogopite
Xenolith
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Peridotite
Metasomatism
Xenolith
Carbonatite
Lile
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23.0±1.2 Ma was obtained by Rb-Sr method for a phlogopite-bearing spinel lherzolite from the Horoman peridotite complex in the Hidaka metamorphic belt, Hokkaido, Japan. The age is essentially identical to the oldest ages of the country metamorphic rocks reported so far in the Hidaka metamorphic belt, and may indicate the time of a metasomatic event which occurred in the wedge mantle. This metasomatic event may have occurred during uplift of this mantle fragment under mantle conditions contemporaneously with elevation of the Hidaka metamorphic belt resulting from collision between the Eurasian and North American plates.
Peridotite
Metasomatism
Phlogopite
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