Stillwater complex (Archean Proterozoic (?) Quartz monzonite differs from granodiorite by containing more alkali feldspar, usually more biotite and less hornblende, and oligoclase instead of andesine as the plagioclase mineral. Is granite a syenite? Because of its coloring, it is often confused with granite, but whereas granite contains more than 20% quartz, quartz monzonite is only 5-20% quartz.Rock with less than five percent quartz is classified as monzonite. [citation needed], Quartz monzonite bedrock from a USGS drill core at western, The examples and perspective in this section, Learn how and when to remove this template message, The Church of Jesus Christ of Latter-day Saints, "The Geology of New Hampshire: Part II - Bedrock Geology", https://en.wikipedia.org/w/index.php?title=Quartz_monzonite&oldid=1091687780, This page was last edited on 5 June 2022, at 19:04. Sphene (titanite) and apatite are common accessory minerals. Quartz is present in significant amounts. 2.8 % Li2O over 2.8 meters at 174.5 meters down hole (SGP-005) 2.4 % Li2O over 6.0 meters at 16.0 meters down hole (GRP-003) 2.4 % Li2O over 4.9 meters at 78.5 meters down hole (GRP-003) 1.3 % Li2O over 10.5 meters at 30.5 meters down hole (GRP-005) 2.1 % Li2O over 8.8 meters at 69.0 meters down hole (GRP-008) Small amounts of quartz and feldspathoids may occur. [5] The alkali feldspar is typically orthoclase. Rocks similar to those of the type area have been described from Norway (akerite), Montana (yogoite, shonkinite), Sakhalin Island off the Pacific coast of Russia, and other localities throughout the world. Vernal Mesa Quartz Monzonite. 1; noun monzonite A granular igneous rock with a composition intermediate between syenite and diorite, containing approximately equal amounts of orthoclase and plagioclase. Many syenite and granite samples are actually monzonites. The GRP dykes crosscut plutonic intrusive rocks of Monzonite composition, exhibiting medium to coarse grained Plagioclase crystals within a fine to medium grained mafic groundmass. Normally it is not possible to determine the composition of these rocks. This rock type is found in a wide variety of colors. in America may be granite (monzogranite) or adamellite in Europe. The term is now deprecated. What is monzonite porphyry? Contacts with the. Check 'monzonite' translations into French. A sample from France. Approximately equal amounts of alkali and plagioclase feldspar, very little quartz, and a subordinate amount of mafic minerals. Because of its coloring, it is often confused with granite, but whereas granite contains more than 20% quartz, quartz monzonite is only 520% quartz. Monzonite is composed mostly of plagioclase and alkali feldspar. Monzonite is an intermediate igneous intrusive rock composed of approximately equal amounts of K-feldspars and Na-plagioclase with minor amount of quartz (<5%) and ferromagnesian minerals (hornblende, biotite and pyroxene).. What type of rock is quartz monzonite? It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock. Monzonite is composed mostly of plagioclase and alkali feldspar. Width of sample 6 cm. Updates? [10], The Bingham mine consists of porphyry copper deposits hosted in altered monzonite. The dominant mineral is alkali feldspar, usually orthoclase. There are 10 establish routes ranging from 5.6 to 5.10d. Quartz monzonite, also called adamellite, intrusive igneous rock (solidified from a liquid state) that contains plagioclase feldspar, orthoclase feldspar, and quartz. Monzonite contains little or no quartz. monzonite composition. Although monzonite itself is not a particularly well-known or widespread rock type, but it has given part of its name (monzo-) as a prefix to several other varieties of plutonic rocks (monzogranite, monzogabbro, foid monzosyenite, etc.). See all related content quartz monzonite, also called adamellite, intrusive igneous rock (solidified from a liquid state) that contains plagioclase feldspar, orthoclase feldspar, and quartz. At high degrees of partial melting of the crust, granitoids such as tonalite, granodiorite and monzonite can be produced, but other mechanisms are typically . Quartz, nepheline, and olivine, which are occasionally present, produce quartz, nepheline, and olivene monzonites. Moissanite has a refractive index from 2.65 -. So the situation is really complicated and in my opinion it should be better for everyone if we all follow one classification scheme (shown below), although it definitely is not without its own problems. Monzonite is an intermediate igneous intrusive rock composed of approximately equal amounts of K-feldspars and Na-plagioclase with minor amount of quartz (<5%) and ferromagnesian minerals (hornblende, biotite and pyroxene). A different type of brilliance is what makes it possible to distinguish a moissanite. The dominant structural features in the region strike northwest-southeast. monzodiorite is a coarse-grained igneous rock consisting of essential plagioclase feldspar, orthoclase feldspar, hornblende, and biotite, with or without pyroxene. The southern and central portions of the region contains quartz monzonite. Quartz monzonite, also called adamellite, intrusive igneous rock (solidified from a liquid . Composition profiles and mapping of selected mafic microgranular enclaves (MMEs) in Muchen quartz monzonite in eastern South China give constraints on the interaction between mingled mafic and . Monzonite is an igneous intrusive rock, formed by slow cooling of underground magma that has a moderate silica content and is enriched in alkali metal oxides. ine) in about equal proportions or with slight predom Pyroxenite is an ultramafic igneous rock that contain pyroxene group minerals such as augite, diopside, hypersthene, bronzite or enstatite. From: Introduction to Mineralogy and Petrology, 2014 Download as PDF About this page Igneous rocks An information card with details on the rock formation, mineral content, characteristics, and uses is included. The chief basis for distinction, in brief, is the type of feldspar. Windsorite, ukrainite, masanite, srkedalite, larvikite, vallevarite, amherstite, and kjelsasite are all varieties found in specific locations. Porphyries are rocks that contain large, conspicuous crystals in a finer groundmass of minerals. It usually does not form its own plutons. This is a coarse-grained rock and that contains at least 90 percent pyroxene minerals. Equigranular monzonite of the Bingham stock, the main host for the Bingham porphyry copper deposit, was an augite-actinolite-biotite monzonite before alteration, the same composition as the largely unaltered and unmineralized Last Chance stock adjacent to the mine. The groundmass consists of amphiboles and occasional biotite. These likely formed as a mixture of immiscible granite liquid with cumulates composed of plagioclase and pyroxene, which supports the theory that lunar granites form through silicate liquid immiscibility. Click the photo for the full-size version. Larvikite is a variety from Norway. Albitic to potassic feldspars occur frequently within the rock. Please refer to the appropriate style manual or other sources if you have any questions. Width of sample 7 cm. . It usually does not form its own plutons. Is monzonite a rock? The rock is very coarse grained providing excellent friction. It may be partly due to the different traditions in Europe and North America which can create confusion. About Snow Lake Resources Ltd. It has much less quartz than granite. McKinley Rock is a 350 ft high dome-like andesitic dike formation at the top of Steamboat watershed on the Umpqua National Forest. Quartz monzonite is an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. Alteration has converted some of the monzonite to compositions resembling quartz monzonite or granite, by altering plagioclase to potassium feldspar and emplacing hydrothermal quartz. Geology of the GRP Dyke and Host Rocks The GRP dykes crosscut plutonic intrusive rocks of Monzonite composition, exhibiting medium to coarse grained Plagioclase crystals within a fine to medium grained mafic groundmass. The white light. It is a relatively uncommon rock type. Quartz monzon. Monzonite is defined as rock having less than 5% quartz in its QAPF fraction and in which alkali feldspar makes up between 35% and 65% of the total feldspar content. Ranges in composition from quartz monzonite to granodiorite, composed of quartz, po tassic feldspar, and plagioclase (oligoclase or andes-. Biotite and/or hornblende constitute the dark minerals. Diamonds reflect light in three different ways. The monzonites in fact approach rather closely to the calculated mean composition of the outer . Please refer to the appropriate style manual or other sources if you have any questions. [citation needed], A large pluton in the Atlanta lobe of the Idaho Batholith, near McCall, Idaho, is made of quartz monzonite. The plagioclase is typically intermediate to sodic in composition, andesine to oligoclase. This phase is interpreted as having been coincident with the K-metasomatism of the wall rocks. Feldspar is often perthitic (plagiopclase in alkali feldspar) or antiperthitic (alkali feldspar in plagioclase), which makes it harder to visually estimate whether the rock sample is monzonite or not. Composition; Mostly plagioclase and alkali feldspar: Monzonite is an igneous intrusive rock, formed by slow cooling of underground magma that has a moderate silica content and is enriched in alkali metal oxides. Rock with less than five percent quartz is classified as monzonite. It is abundant in the large batholiths (great masses of igneous rocks mostly deep below the surface) of the worlds mountain belts. Let us know if you have suggestions to improve this article (requires login). [1], The term adamellite was originally applied by A. Cathrein in 1890 to orthoclase-bearing tonalite (likely a granodiorite) at Monte Adamello, Italy, in 1890, but later came to refer to quartz monzonite. They have roughly equal amounts of alkali feldspar (A) and plagioclase (P), and little or no quartz (Q). Geology & Mineralization | Minera Alamos Inc. Geology & Mineralization The project area is predominantly underlain by Upper Cretaceous intrusive rocks of granodiorite to quartz monzonite composition locally overlain by Lower Tertiary rhyolites and andesites. What is the composition of monzonite? Ward's Monzonite (Quartz Porphyry) When minerals, rocks, and fossils cannot be accurately identified by macroscopic observation and testing, thin section slides can reveal the composition and structure of the specimens on a microscopic level. The plagioclase is typically intermediate to sodic in composition, andesine to oligoclase. How is monzonite made? Quartz monzonite (or adamellite) is an intrusive igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. [2][4], The plagioclase in monzonite is sodium-rich, ranging from oligoclase to andesine, and is moderately well shaped (subhedral to euhedral). This is a process in which high-silica and low-silica components of a magma separate like oil and vinegar. Basic glass is rare so rocks named, except scoria, will normally be silicic. Our editors will review what youve submitted and determine whether to revise the article. Syenodiorite is an obsolescent term for monzonite[1] or for monzodiorite. The distribution of mineralization in this zone is in disseminated form associated with volcanic rocks and porphyries of quartz-monzonite composition; in the replacement zone the occurrence of mineralization is in disseminated, nodular (patchy) form by cavity filling and replacement along the bedding planes. The Pegmatite dyke cross cuts dominantly intrusive rocks of diorite to monzonite composition, exhibiting a gabbroic texture with variable amounts of mafic (Fe-Mg) minerals. A rock with more alkali feldspar is a syenite whereas one with more plagioclase is a quartz diorite. The chief basis for distinction, in brief . Unlike the deep-seated, coarse-grained peridotite, it shows clear signs of having been erupted. [4], Stone Mountain in Georgia is a large quartz monzonite monadnock. Monzonite is composed mostly of plagioclase and alkali feldspar. Such rocks are classified by their relative percentages of quartz, plagioclase, alkali feldspar, and feldspathoid (the QAPF classification). Width of sample 17 cm. monzonite, intrusive igneous rock that contains abundant and approximately equal amounts of plagioclase and potash feldspar; it also contains subordinate amounts of biotite and hornblende, and sometimes minor quantities of orthopyroxene. The Pegmatite dyke cross cuts dominantly intrusive rocks of diorite to monzonite composition, exhibiting a gabbroic texture with variable amounts of mafic (Fe-Mg) minerals. [2] Larvikite is a particular form of monzonite. The pluton comprises three distinct lithologies: a) the basic group of gabbro; b) the intermediate group of monzonite, quartz monzonite, monzogabbro and quartz monzogabbro; and c) the felsic group . [9], Diorite, monzonite, and syenite are found together on the margins of the Paleoproterozoic North China craton. . In this diagram, monzonitic rocks occupy a central position. This article was most recently revised and updated by, https://www.britannica.com/science/monzonite. Accessories are apatite, zircon, sphene, and opaque oxides. [citation needed], Quartz monzonite extracted from a quarry in Little Cottonwood Canyon was used to build several buildings in Salt Lake City, Utah, including The Church of Jesus Christ of Latter-day Saints' Salt Lake Temple, Church Administration Building, and Conference Center, as well as the Utah State Capitol. Rock richer in alkali feldspar is classified as syenite, while rock richer in plagioclase is termed a monzodiorite. 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