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tholeiite

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

tholeiite An extraordinarily abundant, fine-grained, igneous rock consisting of essential calcium-plagioclase, subcalcic augite, and pigeonite, with interstitial glass or fine quartz-feldspar intergrowths. Tholeiite is a type of basalt, oversaturated with silica; it occurs as plateau lavas on the continental crust and as the main extrusive component of the ocean floor. Compare MID-OCEAN-RIDGE BASALT.

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AILSA ALLABY and MICHAEL ALLABY. "tholeiite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 9 Dec. 2009 <http://www.encyclopedia.com>.

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