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monzonite |
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monzoniteType of igneous rock that contains abundant and approximately equal amounts of plagioclase and potash feldspar, as well as other minerals. The type region is Monzoni, Italy, in the Italian Tirol; similar rocks have been described from Montana, Norway, Sakhalin Island, and other localities. Monzonite is not rare, but it generally occurs in rather small, heterogeneous masses mixed with diorites, pyroxenites, or gabbros. monzonite [′män·zə‚nīt] (petrology) A phaneritic (visibly crystalline) plutonic rock composed chiefly of sodic plagioclase and alkali feldspar, with subordinate amounts of dark-colored minerals, intermediate between syenite and dorite. 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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In terms of composition, these intrusive rocks are quartz monzonites. They are former gold producers that exploited high-grade gold veins hosted in the quartz monzonites of the Idaho Batholith. The Eddy property is underlain by mid Proterozoic sediments of the Purcell Supergroup that have been intruded by quartz diorites and monzonites of the mid-Cretaceous Bayonne plutonic suite and possibly by the Eocene Coryell syenites. |
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