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basanite |
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basanite [ˈbæsəˌnaɪt] n (Earth Sciences / Geological Science) a black basaltic rock containing plagioclase, augite, olivine, and nepheline, leucite, or analcite, formerly used as a touchstone [see basalt] 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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Three reference suites from Iceland, Moorea and Tristan da Cunha illustrate (respectively) the tholeiitic series containing basalt to rhyolite, the alkaline series with alkali basalts to trachytes and a strongly alkaline series, beginning with basanite and ultimately yielding phonolite; few oceanic islands contain tholeiiteseries rocks. Carrier rocks are postulated to be nephelinite, basanite and leucitite. |
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