ultramafic rocks contain

Ultramafic rocks ( ultramafites or ultramafolites) are igneous and metamorphic rocks that consist predominantly of mafic (ferromagnesian) and related minerals.The more important primary mafic minerals are olivine, pyroxene, hornblende, mica, garnet, and opaque ores; the most abundant secondary or metamorphic minerals are serpentine, chlorite, amphibole, epidote, and magnetite. Ultramafic Rock. Shown in the photo is a specimen of peridotite. Ultramafic rocks are those containing >18 % MgO and <45 % SiO 2 and include igneous rocks (dunites, peridotites) and metamorphic rocks (talc carbonate and serpentinite). ULTRAMAFIC COMPLEXES Ultramafic complexes can be divided into three major categories: Alpine, Alaskan and Layered intrusive types. No ultramafic rocks are shown in Solano and Ultramafic rocks are locally cut by gabbroid and pyroxenite veins. Gabbroic rocks enclosed in the serpentinite often contain the actinolite-prehnite-pumpellyite assemblage without calcite (Muraoka, 1977MS, 1977). It is poor in silica, in the 40% or less range. 2007a). Characterized in large part by serpentinite-matrix melanges containing blocks and slabs of ultramafic and other rocks: Stratigraphic units: Feather River peridotite, Kings River ophiolite, Kings-Kaweah ophiolite melange Unakite. Ultramafic rocks contain a high levels of iron and manganese, low levels of silica and high concentration of such toxic elements as nickel, chromium, and cobalt, the soil resembles the oxisols on basic igneous rocks, but they are variable as the forest they bear. Site 780 (19°32.5'N, 146°39.2'E) is located on the western side of Conical Seamount near the summit, at a depth of 3083.4 mbsl. It should be used only as a general guide to the presence of ultramafic rocks that may contain asbestos. Mafic rocks are low in silica, in the 45-50% range. These rocks are rare on the surface, but make up peridotite, the rock of the upper mantle. This is a coarse-grained rock and that contains at least 90 percent pyroxene minerals. Ultramafic Rocks ... assuming excess H 2 O. Peridotites also contain an aluminous phase, either plagioclase, spinel, or garnet. As a result, a distinctive type of vegetation develops on these soils. In hand specimen, chromite is mostly easily seen in fresh specimens of dunite . An igneous rock with a very low silica content and rich in minerals such as hypersthene, augite, and olivine. Igneous rock - Igneous rock - Mineralogical components: The major mineralogical components of igneous rocks can be divided into two groups: felsic (from feldspar and silica) and mafic (from magnesium and ferrous iron). More than 700 different types of igneous rocks are known. Opaque accessory mineral is often chromite . A granite that contains significant amounts of epidote. Igneous rocks form from the cooling and hardening of molten magma in many different environments. Ultramafic rocks also contain elevated amounts of chromium and nickel which may be toxic to plants. Sulfide bodies containing Ni, Cu and PGE are commonly found in pyroxenitic layers near the stratigraphic level that plagioclase first becomes a cumulus mineral (150 m below to 500 m above the mafic-ultramafic boundary) or mineralisation may also occur at the base of cyclic units (Hoatson, 1998). Part 5. Pyroxenite is an ultramafic igneous rock that contain pyroxene group minerals such as augite, diopside, hypersthene, bronzite or enstatite. The felsic minerals include quartz, tridymite, cristobalite, feldspars (plagioclase and alkali feldspar), feldspathoids (nepheline and leucite), muscovite, and corundum. The structural relations between the ultramafic rocks and the "country rock" are seen best in the Silla Gibara hill mass 5 km southeast of Gibara. Ultramafic refers to the extremely mafic rocks composed of mostly olivine and some pyroxene which have even more magnesium and iron and even less silica. Ultramafic rocks Their low silica and gas contents make them very fluid; i.e., they have a low viscosity, or resistance to flow. Ultramafic rock forms when rock of a very low silica content, even lower than that of mafic rock, solidifies. See more. Gabbroic rocks can also contain olivine, though in much lower amounts so that the serpentine remains limited. Gabbroids from the Berezovka massif contain ultramafic xenoliths. Earth material; Plutonic rock; Ultramafic intrusive rock. Also Pyroxenite contain olivine and oxide minerals, when it occurs in layered intrusions or nepheline. Subtopics: Hornblendite Peridotite Pyroxenite. Instead, alteration of pyroxenes and plagioclases forms other hydrated minerals such as amphibole, chlorite, and talc, which also modify the physical properties of these rocks. Ultramafic definition, ultrabasic. 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