Andesite - Wikipedia, the free encyclopedia
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Andesite (pronounced /ˈændəsaɪt/ ) is an extrusive igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture. The mineral assemblage is typically dominated by p...
en.wikipedia.org/wiki/Andesite
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is formed when a magma cools underground and crystallizes or when it erupts unto the surface of the ground, cools and crystallizes. Magma that erupts onto the surface is called lava. When magma cools slowly underground the crystals are large enough to see. ... Compare To: diabase, gabbro, slate, schist...
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www.rockhounds.com/rockshop/rockkey/index.html
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Gabbro is basically a dark colored, coarse grained and intrusive igneous rock. It is chemically equivalent to basalt. The earth's surface is largely underlain by Gabbro within the crust of oceans. It is produced by basalt magmatism at mid o...
http://www.blurtit.com/q394038.html
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Ophiolitic gabbro forms between the ultramafic substratum near the mantle and overlying basaltic lavas, presumably crystallized at depth during the opening of an oceanic basin.
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homepage.mac.com/kvmagruder/earth/collections/Gabbro.ht...
homepage.mac.com/kvmagruder/earth/collections/Gabbro.htm
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Field Journal for geology field trip to Southern Appalachian Mountains ... Mapping Mt. Carmel Gabbro; Charleston Crossroads, Calhoun Mill, Belcher Crossroads ... Mt Carmel gabbro formed as a result of back-arc spreading, solidifying underground in a small magma chamber; 400-500 myo: Ordovician)
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www.usd.edu/~cmarek/appalachians/tuesday.html
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In addition, the latest Ba-Ti-rich mica in the Western Gabbro formed in response to infiltration of fluids derived from adjacent bodies of Ba-rich syenite pegmatite.
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canmin.geoscienceworld.org/cgi/content/abstract/34/5/96...
canmin.geoscienceworld.org/cgi/content/abstract/34/5/967
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