Gabbro is a dark-colored coarse-grained intrusive igneous rock. It is the most abundant rock in the deep oceanic crust. Gabbro has a variety of uses in the construction industry. It is used for everything from crushed stone base materials at construction sites to polished stone counter tops and floor tiles. Igneous rock composition chart: A chart that illustrates the generalized mineral composition of igneous rocks. By studying this chart, you can see that gabbros and basalts are composed mainly of plagioclase feldspar, micas, amphiboles, and olivine.
Gabbro ( /ˈɡæbroʊ/) is a phaneritic (coarse-grained), mafic intrusive igneous rock formed from the slow cooling of magnesium-rich and iron-rich magma into a holocrystalline mass deep beneath the Earth's surface. Much of the Earth's oceanic crust is made of gabbro, formed at mid-ocean ridges. Gabbro is also found as plutons associated with continental volcanism.
East Pacific Rise Poikilitic Gabbro. Fast-spreading ridge (ca. 65 mm/year) lower oceanic crust is exposed at Hess Deep (Francheteau et a. 1990), which is located close to the Galapagos triple junction between the East Pacific Rise and the Galapagos rift (2°15′N, 101°33′W). We calculated the gabbro protolith Sr concentration to be 100 μg/g and Sr/Sr to be 7, using MELTS (Ghiorso and Sack, 1995) gabbro modal abundances and measured trace element compositions in plagioclase and clinopyroxene cores. MOR primitive glasses have Sr/Sr values close to . –1. 5 (Gale et a. 2013 and PetDB, Lehnert et a. 2000 databases).
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Gabbro is an igneous rock, is coarse-grained, dark-colored and intrusive. It is usually composed mainly of the minerals, calcium-rich plagioclase feldspar and augite. It may also contain small amounts of olivine and orthopyroxene, but very little amounts of quartz, unlike most igneous rocks. It is the most abundant rock in deep oceanic crust, and can be black or dark green in color. Gabbro is related to basalt because it is equivalent in its composition. Interesting Gabbro Facts: Gabbro color depends on its texture and on the environment where the rock is found. It is not a reliable property because it may change within the rock. The top layer of the oceanic crust is basaltic, but the deeper rocks of the oceanic crust is made up of gabbro. On continents, slow cooling allows large crystals to form as it is found within thick lava flows of basaltic composition.
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- DJ Mix – Gabbro