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O que (quem) é ultrabasic - definição
IGNEOUS ROCK TYPE
Ultramafic Rock; Ultrabasic; Ultramafic; Ultra-mafic; Ultramafic rocks; Ultrabasic rock; Ultramafine; Ultrabasic rocks; Ultramafic soil
ultramafic
[??ltr?'maf?k]
¦ adjective Geology relating to or denoting igneous rocks composed chiefly of mafic minerals.
Ultramafic rock
Ultramafic rocks (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are composed of usually greater than 90% mafic minerals (dark colored, high magnesium and iron content). The Earth's mantle is composed of ultramafic rocks.
Wikipédia
Ultramafic rock
Ultramafic rocks (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are composed of usually greater than 90% mafic minerals (dark colored, high magnesium and iron content). The Earth's mantle is composed of ultramafic rocks. Ultrabasic is a more inclusive term that includes igneous rocks with low silica content that may not be extremely enriched in Fe and Mg, such as carbonatites and ultrapotassic igneous rocks.
