Rhyolites And Granites

Rhyolite is a fine grained igneous rock which is rich in silica.

Rhyolites and granites.

However the abundances of critical trace. The trace element contents of granites and their volcanic equivalents rhyolites are highly variable more so than basalts largely because of the effect of small amounts of accessory phases such as zircon monazite allanite and titanite both in their source regions and during granite crystallization. Rhyolite is similar in composition and appearance to granite but it forms through a. One is intrusive and the other is extrusive.

Please don t take this as always true but it is a close enough estimate in most cases. So if we assume the above to be true then the only difference between the rocks is that one is plutonic and the other is volcanic. Rhyolite extrusive igneous rock that is the volcanic equivalent of granite most rhyolites are porphyritic indicating that crystallization began prior to extrusion. Granites and rhyolites appear to overlap in age although rhyolites built up first with the rhyolite pile thickening as later granites coarsened texturally to medium.

Rhyolite is a silica rich igneous rock found throughout the world. Due to their high content of silica and low iron and magnesium contents rhyolitic magmas form highly viscous lavas they also occur as breccias or in volcanic plugs and dikes rhyolites that cool too quickly to grow crystals form a. Granite is a very hard granular crystalline igneous rock which consists mainly of quartz mica and feldspar and is often used as building stone. In such cases the rock may consist principally of well developed large single crystals phenocrysts at the time of extrusion.

Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock and consequently outcrops of rhyolite may bear a resemblance to granite. So i m going to make a general comment and say that a granite is genetically the same has the same composition as a rhyolite. The cambrian southern oklahoma aulacogen soa exposes shallow seated a type sheet granites emplaced on top of layered mafic bodies and under cover of a type rhyolites this gabbro rhyolite boundary being a crustal magma trap.