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What is the first mineral to crystallize basaltic magma?

Let's supposed you have a basaltic magma at depth the earth's surface.?

  • Some of the minerals with the highest melting point crystallize and settle to the bottom of the magma. Are the first minerals that crystallize and settle to the bottom of the magma higher or lower in silica content than the remaining magma? why?

  • Answer:

    Lower in Silica; Mafic (basaltic) rocks SiO2 < 50% FeO and MgO typically < 10 wt%, crystalise at temperatures up to ~1300°C. While Felsic (rhyolitic) rocks SiO2 >70% Fe-Mg: ~ 2%, crystalise at temp < 900°C

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Im also stuck on this questiooon =/ lol

Sergio

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