Komatiites are presently no longer formed on Earth. This reference material gives a window into the very beginnings of our planet.
OriginKomatiite from Serpentine Mt. in McArthur Township, Ontario Canada
- Highly depleted in most trace elements, except for transition metals.
- LILE (Rb, Sr, K, Ba): 1.00 - 365 µg/g.
- HFSE (Zr, Hf, Th, U, Nb, Ta) 0.012 - 17 µg/g.
- Transition metals (Sc, V, Cr, Co, Ni, Cu, Zn) 27.9 - 2460 µg/g.
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Ultramafic rocks are characterised by very low silica (SiO2) content of <45 m/m%. and low potassium. Their principal mineralogy is comprised of Mg and Fe-rich minerals such as pyroxenes and olivine. The Earth's mantle consists of ultramafic rocks. Another term used to describe these rocks is ultrabasic, which includes rocks, that have a low silica content, but are not high in Mg and Fe i.e. carbonatites and ultrapotassic igneous rocks.