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Author Question: Briefly explain why felsic intrusive rocks are actually more common than mafic intrusive rocks What ... (Read 35 times)

elizabeth18

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on: Jul 15, 2018
Briefly explain why felsic intrusive rocks are actually more common than mafic intrusive rocks What will be an ideal response?

Question 2

Why does Bowen's reaction series predict that mafic intrusive rocks should be much more common
  than felsic intrusive rocks? What will be an ideal response?



s.meritte

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Reply #1 on: Jul 15, 2018
Answer to Question 1

Partial melting of mafic oceanic rocks and silica-rich sediments yields magmas richer in silica than the
original magma. Also, assimilation of continental crust into the magma raises the silica values.



Answer to Question 2

If crystal settling produces the magma, there would need to be about 10 times as much mafic magma
present to yield the amount of felsic rock.



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