Answering the following questions about magma/lava: a.) Why would rhyolite depos

Question

Answering the following questions about magma/lava:

a.) Why would rhyolite deposits be less common than granite deposits?

b.) In the process of a magma cooling and crystallizing, if the original melt contained large amounts of iron, why isn't quartz a ferromagnesian mineral?

c.) How could a researcher use magmatic differentiation to determine if a batholith is the result of one body of magma cooling and crystallizing or multiple bodies of magma?

d.) Differentiate the three types of magma based on their igneous compositions, temperatures, and silica contents.

Explanation / Answer

a). Granite and rhyloite are both igneous roc and felsic in nature. Felsic rocks, in general, form the bulk of the continental plates.  The surface of the earth is covered by oceanic and continental crustal materials, granite very common. Rhyolite is extusive rocks and which magmas are very viscous, which makes them more likely to remain below the surface and cool intrusively than to make it to the surface. hence rhyolite deposits be less common than granite deposits.

b). In the process of a magma cooling and crystallizing, if the original melt containes large amounts of iron than it is not quartz a ferromagnesium mineral because  as a magma begins to crystallize, early-forming minerals like olivine will remove iron from the melt and lock it away in solid crystals, thus preventing later minerals from using iron in their molecular structures.

c). Three types of magma based on their igneous composition, temperature and silica contents are as follows:

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