Gabbro 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. It was intruded by basaltic magma of a second period of magmatic activity which formed rocks that commonly are banded, and hence called the layered series. $10.19. Dunite. High pressure is usually found deep below the surface of the Earth. Gabbro can be formed as a massive intrusion by crystallization of pyroxene and plagioclase, or as alternating light plagioclase feldspar and dark clinopyroxene layer. Schist and quartzite may be formed alongside gneiss, along with other types of metamorphic rock formed from igneous rocks. Mafic magmas, formed in Earth’s upper mantle, sometimes contain significant amounts of periodot, garnet (grossular), and diamond known to form at great depths. Gabbro can be formed as a massive, uniform intrusion via in-situ crystallization of pyroxene and plagioclase, or as part of a layered intrusion as a cumulate formed by settling of pyroxene and plagioclase. 21. Location: Gabbro is a fairly common igneous rock, found in many locations worldwide. Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt. When the magma cools at the surface, basalt rock is formed. Basalts are formed by molten rock material … It is composed mostly of the mineral plagioclase feldspar with smaller amounts of pyroxene and olivine. The gabbroic rocks of the layered series as well as the older anorthositic gabbro are cut by intrusive bodies of ferrogranodiorite and granophyre and by late dikes of basalt and aplite. Still further in the southeast (around Todtmoos) is a range of exotic inclusions: gabbro from Ehrsberg, serpentinites and pyroxenites near Todtmoos, norite near Horbach), which are possibly the remnants of an accretionary wedge from a continental collision. Composition. Generally, the slower the molten rock cooled, the larger it’s mineral crystals with K-Feldspar megacrysts forming in special circumstances greater than 5cm. Cumulate gabbros are more properly termed pyroxene-plagioclase orthocumulate. C) The plagioclase feldspars in the granite and rhyolite decompose readily to clay minerals and iron oxides. $13.95. KEY TO MINERALS PYROXENE PLÄGiÖCLASE HORNBLENDE C oUse This igneous rock is A) gabbro C) basalt Gabbro is a large group of dark, coarse-grained, igneous rocks. Gabbro is very similar to basalt in its mineral make up. A) The quartz in the gabbro and basalt decomposes very quickly. As this magma, or molten rock emerges to the surface, it experiences a change in temperature and pressure, which forces it to cool and crystallize, forming rock. The rocks are plutonic, formed when molten magma is trapped under the Earth 's surface and cools into a crystalline mass. Gabbro Gabbro is a dense, mafic intrusive rock. Gabbro is also found as plutons associated with continental volcanism. The processes that creates gneiss can recreate normal granite if carried on long enough, and gneiss can also form from gabbro or shale. Formed from particles that fused together, and composed of ejected fragments. Here, molten material cools very slowly. Mafic rocks contain silicates and are high in magnesium and iron. A thin layer of rocks at or above the oceanic crust are the basalts. Gabbro is a coarse-grained igneous rock that forms when iron-rich magma cools slowly deep within the Earth. Gabbro is a mafic type of rock with a specific composition. 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