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andesite |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.06 sec. |
andesiteAny member of a large family of rocks that occur in most of the world's volcanic areas, mainly as surface deposits and to a lesser extent as dikes and small plugs. The Andes, where the name was first applied, and most of the cordillera (parallel mountain chains) of Central and North America consist largely of andesites. They also occur in abundance in volcanoes along practically the entire margin of the Pacific basin. Andesites are most often porphyritic (having distinct crystals in a fine-grained base) rocks. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Mineralization is hosted within a central andesitic volcanic
complex. A series of mineralized quartz latite dikes that has
intruded the basal andesitic volcanic units is known to host silver
mineralization over a wide zone that extends into the Montecristo III
concession. Indeed, bedrock float reported form the Karfakolo prospect
includes altered metasediments displaying fresh, disseminated pyrite,
coarse grained dolerite, dacitic to andesitic volcanics, hornfeled
metasediments and sheared acidic intrusive. |
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