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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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| In the Gayot Lake area, Virginia Gold Mines and partner BHP Minerals discovered several Ni-Cu-PGE showings in komatiitic lavas and ultramafic intrusive rocks of the Venus volcano-sedimentary belt. The pyrite-bearing mineralization appears structurally controlled within highly reactive rocks including widespread komatiites, komatiitic basalts and basalts. Hot spot basaltic magmatism is now seen as the most likely cause of giant komatiitic Ni-Cu deposits in the Archean, and Norilsk-type deposits in the Paleozoic (Yakubchuk and Nikishin 2004). |
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