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  2. Rhyolite - Wikipedia

    en.wikipedia.org/wiki/Rhyolite

    Rhyolite magmas can be produced by igneous differentiation of a more mafic (silica-poor) magma, through fractional crystallization or by assimilation of melted crustal rock . Associations of andesites , dacites , and rhyolites in similar tectonic settings and with similar chemistry suggests that the rhyolite members were formed by ...

  3. Magmatic water - Wikipedia

    en.wikipedia.org/wiki/Magmatic_water

    Rhyolitic magma is felsic and the most abundant in silica, potassium, and sodium but the lowest in iron, magnesium, and calcium. [1] [3] The silica composition of rhyolitic magma ranges from 65-75 wt.%. [1] It forms in the lowest temperature range, from about 1200 °F to 1470 °F. [1], [3] Rhyolitic magma has the highest viscosity and gas ...

  4. Magma - Wikipedia

    en.wikipedia.org/wiki/Magma

    Magma can be found in the mantle or molten crust. Magma (from Ancient Greek μάγμα (mágma) 'thick unguent') [1] is the molten or semi-molten natural material from which all igneous rocks are formed. [2]

  5. Types of volcanic eruptions - Wikipedia

    en.wikipedia.org/wiki/Types_of_volcanic_eruptions

    The process powering Plinian eruptions starts in the magma chamber, where dissolved volatile gases are stored in the magma. The gases vesiculate and accumulate as they rise through the magma conduit. These bubbles agglutinate and once they reach a certain size (about 75% of the total volume of the magma conduit) they explode.

  6. Lava dome - Wikipedia

    en.wikipedia.org/wiki/Lava_dome

    Rhyolitic lava dome of Chaitén Volcano during its 2008–2010 eruption One of the Inyo Craters, an example of a rhyolite dome Nea Kameni seen from Thera, Santorini. In volcanology, a lava dome is a circular, mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano.

  7. Andesite - Wikipedia

    en.wikipedia.org/wiki/Andesite

    Over time as crystallization continues and the system loses heat, these reservoirs cool. In order to remain active, magma chambers must have continued recharge of hot basaltic melt into the system. When this basaltic material mixes with the evolved rhyolitic magma, the composition is returned to andesite, its intermediate phase. [27]

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Tuff - Wikipedia

    en.wikipedia.org/wiki/Tuff

    Welded tuff is commonly rhyolitic in composition, but examples of all compositions are known. [18] [19] A sequence of ash flows may consist of multiple cooling units. These can be distinguished by the degree of welding.