Discussion
Which of the following is not true for Komatiites ?
Answer: D
The statement not true of komatiites is They are characterized by ophitic texture.
Komatiites are characterised by spinifex texture: long, bladed or skeletal olivine and pyroxene crystals that grew rapidly in a quenched ultramafic lava. Ophitic texture, with pyroxene enclosing plagioclase laths, is typical of dolerite.
The other statements are true. Komatiites are ultramafic lavas with over 18% MgO, erupted at very high temperatures. They are mostly Archaean, because the mantle was hotter then, and they occur in greenstone belts such as Barberton in South Africa, where they were first described.
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