komatiite

(redirected from Komatiites)

komatiite

[kō′mäd·ē‚īt]
(petrology)
A mantle-derived igneous rock with a high content of magnesium, particularly magnesium oxide.
References in periodicals archive ?
"What is exciting is that this discovery comes at the 50th anniversary of the discovery of komatiites in the Barberton Mountain Land by Wits Professors, the brothers Morris and Richard Viljoen," says Wilson.
Arndt, "Magnesium and iron isotopes in 2.7 Ga Alexo komatiites: Mantle signatures, no evidence for Soret diffusion, and identification of diffusive transport in zoned olivine," Geochimica et Cosmochimica Acta, vol.
When the mantle cooled off as Earth grew up, it stopped making those komatiites.
However, the Maryland team examined volcanic rocks that flourished in the first half of Earth's history, called komatiites, and found that these have a different type of composition than what they, or anyone, would have, expected.
& TARNEY, J., 1997.--Dynamic melting in plume heads: The formation of Gorgona komatiites and basalts.
Komatiites are ultramafic volcanic rocks that occur mainly in Archean and Paleoproterozoic greenstone belts.
Temperatures up to[?]1700-1900 K were initially derived from Galileo spacecraft data, suggesting that the magmas might be ultra-basic, similar to the komatiites that erupted on Earth earlier in its history.