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gabbro |
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gabbro: see basalt basalt (bəsôlt`, băs`ôlt) ..... Click the link for more information. . gabbroAny of several medium- or coarse-grained rocks that consist primarily of plagioclase feldspar and pyroxene. Gabbros are found widely on the Earth and on the Moon. They are sometimes quarried for dimension stone (“black granite”), but the direct economic value of gabbro is minor. Far more important are the nickel, chromium, and platinum minerals that occur almost exclusively in association with gabbroic or related rocks. Magnetite (iron) and ilmenite (titanium) are also found in gabbroic complexes. gabbro [′gab·rō] (petrology) A group of dark-colored, intrusive igneous rocks with granular texture, composed largely of basic plagioclase and clinopyroxene. 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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| hosted by monotonous sequences of clastic rocks intruded by gabbroic to granitic plutons, and metamorphosed to at least the greenschist fades. The Gradaus-Cumaru project area consists of Archean-age greenstone sequence and granitic to gabbroic intrusives, all of which have been intruded by slightly younger granitic bodies, the more important of which is the Cumaru granodiorite stock. The continental environment features the massive intrusions of the midcontinental rift system, such as the Duluth gabbroic complex and associated intrusions, the Nipissing diabase, the huge Muskox Coppermine Mackenzie intrusive event and the Franklin intrusives in the Arctic. |
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