Ultramafic rocks

OKUM-NP

Komatiites are presently no longer formed on Earth. This reference material gives a window into the very beginnings of our planet.
Origin
Komatiite from Serpentine Mt. in McArthur Township, Ontario Canada
Source producer
IAG
Characteristics
  • 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.
Suitable for
LA-ICP-MS
LIBS
µXRF
XRF
Product information sheet
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Ultramafic rocks

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.