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kimberlite


'kimberlite' can also refer to...

kimberlite

kimberlite

kimberlites

kimberlite

kimberlite

Olivine, and the Origin of Kimberlite

Crystallization of Groundmass Spinel in Kimberlite

Digestion Fractional Crystallization (DFC): an Important Process in the Genesis of Kimberlites. Evidence from Olivine in the Majuagaa Kimberlite, Southern West Greenland

Mantle Mush Compaction: a Key to Understand the Mechanisms of Concentration of Kimberlite Melts and Initiation of Swarms of Kimberlite Dykes

Late Devonian Diamondiferous Kimberlite and Alkaline Picrite (Proto-kimberlite?) Magmatism in the Arkhangelsk Region, NW Russia

A Non-cognate Origin for the Gibeon Kimberlite Megacryst Suite, Namibia: Implications for the Origin of Namibian Kimberlites

Metasomatic Processes in the Central Siberian Cratonic Mantle: Evidence from Garnet Xenocrysts from the Zagadochnaya Kimberlite

Fe-rich Dunite Xenoliths from South African Kimberlites: Cumulates from Karoo Flood Basalts

Olivine in the Udachnaya-East Kimberlite (Yakutia, Russia): Types, Compositions and Origins

Hf Isotope Systematics of Kimberlites and their Megacrysts: New Constraints on their Source Regions

Intensive Variables in Kimberlite Magmas, Lac de Gras, Canada and Implications for Diamond Survival

Cr-Saturation Arrays in Concentrate Garnet Compositions from Kimberlite and their Use in Mantle Barometry

Petrogenesis of Group I Kimberlites from Kimberley, South Africa: Evidence from Bulk-rock Geochemistry

Petrogenesis of Proterozoic Lamproites and Kimberlites from the Cuddapah Basin and Dharwar Craton, Southern India

 

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A brecciated (see breccia), potassic, ultrabasic igneous rock, consisting of megacrysts of olivine, enstatite, Cr-rich diopside, phlogopite, pyrope-almandine garnet, and Mg-rich ilmenite, in a fine-grained groundmass of serpentine, phlogopite, carbonates, perovskite, and chlorite, in varying proportions. Kimberlites contain abundant xenoliths derived from the mantle and, as such, they are extremely useful for investigating mantle mineralogy and chemistry. Many of the mantle-derived xenoliths have been brought up from such great depth that they contain high-pressure minerals, the best known being diamond, the high-pressure form of carbon. Many of the megacrysts of enstatite, Cr-diopside and garnet are likewise thought to be derived from the upper mantle through which the kimberlite ascended, and as such should be termed ‘xenocrysts’. Near the surface, kimberlite is found in clusters of pipe-like bodies called diatremes. Mine workings show that they coalesce at depth and link up with dykes of non-fragmental kimberlite.

Subjects: Earth Sciences and Geography.


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