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tholeiite |
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tholeiite [thō′lēยทə‚īt] (petrology) A group of basalts composed principally of plagioclase, pyroxene, and iron oxide minerals as phenocrysts in a glassy groundmass. Any rock in the group. 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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| Aitutaki; low % melting) show steep slopes and tholeiites low slopes (e. 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. Olivine precipitation appears to begin and end early in tholeiite rock suites creating a restricted range of olivine Fo contents (e. |
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