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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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| 111 Ga Griffin gabbros (formerly Hurwitz gabbros) [#4e] are presumably linked to breakup along the Trans-Hudson margin (Aspler el al. By analyzing the transitions between different minerals in the gabbros and the changes in the crystalline structure, geologists will be able to reconstruct the evolution of the lower crust, says Henry J. The total length of the strike now covering the favourable contact of the intrusive gabbros of the Coldwell Complex and the older volcanic and sedimentary rocks now exceeds 12 km. |
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