Orogenies are subjected to intrusions up to the size of batholiths. Name the type of rock that comes from this?

Orogenies are subjected to intrusions up to the size of batholiths. Name the specific type of rock this type of igneous intrusion.





This is a geology question I have to answer and I'm having problems with it. I thought it might be granite but I thought the answer to the question prior to that one was granite. The question prior was...


"Orogenies are subjected to volcanism, especially in the form of chains of composite cone volcanoes. Name the specific type of rock that comes from this type of volcanism." help please???|||These are worded strangely..





The rock formed at any intrusion is going to depend on the composition of the crust.. so lets assume this orogeny is on the continent, and hence felsic in composition. The igneous intrusion would melt the FELSIC continental crust ...which would make granite.





The question before about the composite volcanoes.. well those are commonly formed at subduction zones.. and at subduction zones we have partial melting of the oceanic (mafic) due to the addition of water via hydrous minerals the mafic magma mixes with the continental (felsic) crust... so INTERMEDIATE rocks form.. such as diorite.





That's the way I understand those questions|||Everything you need to pin point the rock is there. It is extrusive due to volcanism so it is NOT granite or diorite (both are intrusive) and your composition is that which makes up composite cone volcanoes. Comp cone volcanoes are intermediate in composition and therefor your rock in andesite.|||The intrusive could be number of rock-types, but your teacher is almost certainly looking for "granite."


Granite is NOT, incidentally, a volcanic extrusive- I'll let you find that answer on your own though.