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boninite

   Also found in: Wikipedia 0.01 sec.
boninite [′bän·ə‚nīt]
(petrology)
An andesitic rock that contains much glass and abundant phenocrysts of bronzite and less of olivine and augite.


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2003), and some komatiitic basalts that resemble boninites.
Swarms of these dikes are exposed in the Bonin Islands, and one lava type from this environment, boninite, was named for the islands.
This area hosts a band of low titanium tholeiite and boninite mafic volcanic rocks believed to have been emplaced in high heat flow rifting environments, important for the formation of massive sulphide deposits.
 
 
 
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