Partial melting of the upper mantle results in initial (\"primitive\") melt that
ID: 804113 • Letter: P
Question
Partial melting of the upper mantle results in initial ("primitive") melt that has the chemical composition of (circle best answer): rhyolite; peridotite; basalt; granite; limestone Which of the following processes influence changes in magma composition after initial partial melting (circle best answers (there may be more than one))?; crystal fractionation; mixing of the magma with sea water; reaction of the magma with the atmosphere, assimilation of adjacent continental crust; mixing of sea water and the magma; mixing of liquid outer core with magmaExplanation / Answer
2)c basalt
As crust is the product of mantle melting, the chemical composition of Earth's mantle must be somehow reflected in the compositions of melt (usually basalts) as well as peridotite residue.
3)a,d,f
Fractional crystallization/Crystal fractionalization is a process that changes the composition of magma as it makes its way toward the surface.
Crystal settling, assimilation, and magma mixing influence the composition of the magma. Geochemists study the minerals and the chemistry of the lava to determine which processes were involved and how big of a role each one played.