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andesite |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.03 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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| ? Mentioned in | ? References in periodicals archive | |
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However, the rover's study of a Martian rock called Barnacle
Bill indicates that it resembles andesite, a volcanic rock often formed
by several cycles of heating and cooling, although not as many as
granite. TOC 06-44 was drilled along the same cross section as drill hole
TOC 06-43, but aimed in the opposite direction, to probe the width of
the capping andesite and to define the eastern limit of shallow gold
mineralization just beyond the andesite. The Main
San Jacinto vein, ranges in width from two to over 20 meters, is
composed dominantly of vein breccia, probably of hydrothermal origin,
with a fine-grained quartz-chalcedony matrix containing up to 20%
silicified andesite and vein fragments. |
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