EAE1011 - The Earth system: From the core to the atmosphere - S1 2025 Course Materials & Test Answers | learning.monash.edu

You obtain a sample of a crystallised lava and

find that it is felsic (contains quartz and feldspar). What does the

composition of the lava tell you about crystal fractionation processes in the

magma chamber?

That the magma chamber still had a lot of Fe and

Mg when the eruption occurred, so a lot of crystal fractionation had taken

place.

That the magma chamber had almost no Fe and Mg

when the eruption occurred, so relatively little crystal fractionation had

taken place.

That

the magma chamber had almost no Fe and Mg when the eruption occurred, so a lot

of crystal fractionation had taken place.

100%

That

the magma chamber still had a lot of Fe and Mg when the eruption occurred, so

relatively little crystal fractionation had taken place.

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