In general, if a body of igneous (source) rock is subjected to partial melting, the magma that is produced is expected to be

If a body of igneous rock is subjected to partial melting, the magma that is produced is expected to be more felsic than the source rock. It means that the magma is rich or high in concentration of silicate minerals. They are also rich in silicon, aluminum, sodium and potassium.

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Water flows along the east coast and across the western tropical pacific towards south america, while they both are directed towards that way,  el niño does not directly affect the southern flow of water along the coast.