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komatiite |
Also found in: Wikipedia, Hutchinson | 0.02 sec. |
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komatiite [kō′mäd·ē‚īt] (petrology) A mantle-derived igneous rock with a high content of magnesium, particularly magnesium oxide. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| The giant massive sulfide deposits of Kidd Creek are genetically associated with the emplacement of a high-temperature volcanic pile of komatiites and rhyolites (Barrie 1999), and several F-Ba rein systems have been linked to rifting, such as the Rio Grande rift and the Rhine Graben, although such rift systems do not necessarily require deeply rooted mantle processes (Hamilton 2003). Scarfe, has shown that komatiite can be created at much higher pressures--and hence depths in the earth --than was commonly believed. 74 Ga--deposition of sequences of tholeiitic basalt, komatiite, felsic turf, iron formation, and abundant clastic sedimentary rocks, accompanied by the emplacement of voluminous, synvolcanic tonalite-trondhjemite plutonic suites and coeval deformation. |
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