Typical plume-derived flood basalt enriched in most trace elements. Recharacterized after milling
OriginA flood basalt from the Bridal Veil Flow Quarry east of Portland, Oregon, USA. It is part of the Columbia River large igneous province
- LILE (Rb, Sr, K, Ba): 30.0-15000 µg/g.
- HFSE (Zr, Hf, Th, U, Nb, Ta) 0.80-190 µg/g.
- Transition metals (Sc, V, Cr, Co, Ni, Cu, Zn, Mo) 10.0-400 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).