Typical ocean island basalt (OIB) enriched in most trace elements. One of the best characterised and most used geological reference materials. The same material is used by NASA in all kinds of experiments.
OriginA basaltic pahoehoe lava erupted in 1919, Kilauea caldera, Hawaii
- LILE (Rb, Sr, K, Ba): 20.0-4300 µg/g.
- HFSE (Zr, Hf, Th, U, Nb, Ta) 0.40-170 µg/g.
- Transition metals (Sc, V, Cr, Co, Ni, Cu, Zn, Mo) 4.00-300 µg/g.
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Mafic rocks are characterised by a silica content of 45-52 m/m% and similar to ultramafic rocks also consist mainly of olivine and pyroxenes. They do however often also contain the calcium-rich varieties of feldspar and can contain iron-rich micas such as biotite. Basalts make up the oceanic crust, but can also be found on continents as so called Large Igneous Provinces (LIPs).