Anukruti posted an MCQ
November 06, 2020 • 03:53 am 30 points
  • IIT JAM
  • Geology (GG)

The dominant constituent of ultramafic rocks in earth's mantle is

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    Sajan sarthak Best Answer

    Peridotite is ultramafic, as the rock contains less than 45% silica. Peridotite Olivine higher and pyroxene also present. It is high in magnesium (Mg2+), reflecting the high proportions of magnesium-rich olivine, with appreciable iron. This high magnesium indicates high temperature. Peridotite is derived from Earth's mantle, either as solid blocks and fragments, or as crystals accumulated from magmas that formed in the mantle

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    Rahul kumar best-answer

    Olivine is the dominant constituent of ultramafic rocks in Earth's Mantle. Olivine is stable in high pressure and temperature condition and hence remain stable and dominant in Mantle's condition.

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    so is it B or C?

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