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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. 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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Gabbro forms from molten rock, called magma, that rises out of the mantle and hardens deep within the crust. The copper occurs in coarse grained gabbro along the contact of the Coldwell Complex similar to the Marathon Deposit. Beneath the dikes lies a third layer consisting of huge deposits of gabbro rock -- the fossilized remains of ancient magma chambers. |
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