Rhyolite Granite Magma Oceanic Crust

Making up the entire ocean crust and much of continental crust.

Rhyolite granite magma oceanic crust.

When the magma solidifies inside the earth s crust it cools slowly forming coarse textured rocks inclusive of granite gabbro or diorite. Concerns the order of crystallization of minerals from magma. 1992 oceanic islands from reunion island indian ocean. 6 as the young hot oceanic plate is subducted under continental crust the subducted slab partially melts and interacts with the upper mantle through.

White mountain magma series of new hampshire usa and southern quebec canada eby 1987 200 165 ma granite 140 110 ma bimodal basalt and rhyolite eby et al. Granite rhyolite basalt gabbro. Oceanic crust is hydrothermally altered causing addition of quartz and sodium. It may have any texture from glassy aphanitic porphyritic and by the orientation of small crystals reflecting the lava flow.

Basaltic magma is hotter than rhyolitic magma because. Rhyolite is an extrusive silica rich igneous rock. Crystallize at a higher temperature than do silicic minerals. Igneous rock most abundant in the the oceanic crust.

Form rhyolite and granite. Typical intrusive formations are batholiths stocks laccoliths sills and dikes. The last rock type to crystallize from magma as the temperature falls is. It is composed predominantly of quartz k feldspar and biotite.

It has a higher melting point. However rhyolite forms as a result of a violent volcanic eruption while granite forms when magma solidifies beneath the earth s surface. Are rich in iron and magnesium. Granite rhyolite basalt gabbro.

Dacitic magma is formed by the subduction of young oceanic crust under a thick felsic continental plate. What type of volcanic rock contains a large number of cavities bubbles that form when gases escape from the molten rock. The rocks that melt to make magma are composed of many minerals not all of which melt under the same conditions. Rhyolite is extrusive equivalent of granite magma.

Most rhyolites are porphyritic indicating that crystallization began prior to extrusion. Geologists regard basaltic magma hawaiian lava for example as the result of the partial melting of ultramafic rock in the. The oceanic crust is most like. Granite obsidian pumice basalt.