Syenite is a coarse-grained intrusive igneous rock with a general composition similar to that of granite, but deficient in quartz, which, if present at all, occurs in relatively small concentrations (< 5%). orthoclase) is the major mineral component of syenite, total feldspar content is > 65%, and quartz is typically lacking. syenites are part of the Kola Alkaline Province. The true syenites are rocks that fit into the area annotated in red. Syenite is the plutonic equivalent of trachyte. More than 90% of the total feldspar content is in the form of alkali feldspar. Monuments, Sculpture, Small Figurines. In New South Wales, a large syenite intruded during the Buildings, As undersaturated melt is produced, forming a nepheline syenite, where orthoclase fluorescent sodalite were found on a beach in Michigan in 2017. Germany, Norway, Portugal, in Plovdiv, Bulgaria and in Ditrău, Romania. The segregation of the silica from the melt leaves it in Syenitic rock that contains quartz can not contain feldspathoids and vice versa — foid-bearing and foid syenites contain no quartz. Plagioclase feldspars may be present in small proportions, less than 10%. Syenite QAPF diagram that shows the quartz (Q), alkali feldspar (A), and plagioclase (P) composition of syenite leucocratic variety of nepheline syenite from Sweden Syenite is a coarse-grained intrusive igneous rock with a general composition similar to that of granite , but deficient in quartz , which, if present at all, occurs in relatively small concentrations (< 5%). Bonewitz, R. (2012). At very low degrees of partial melting a silica Such feldspars often are interleaved as perthitic components of the rock. Nepheline syenite: Canada, 100%. breakup of Gondwana in the Cretaceous. is replaced by a feldspathoid such as leucite, nepheline or analcime. in Malawi in the Mulanje Mountain Forest Reserve. Alkali feldspar granite contains between 20% – 60% quartz. Syenite rock was used to make Conversely in certain conditions, large volumes of anorthite are apatite, titanite, zircon and opaques. For example: "Petrogenetic processes in the ultramafic, alkaline and carbonatitic magmatism in the Kola Alkaline Province: a review", "Episyenites in the Sevilleta National Wildlife Refuge, Socorro County, New Mexico: preliminary results", https://en.wikipedia.org/w/index.php?title=Syenite&oldid=988038078, Short description is different from Wikidata, Articles with unsourced statements from December 2014, Articles with unsourced statements from November 2019, Creative Commons Attribution-ShareAlike License, In Europe syenite may be found in parts of, In Africa there are syenite formations in, In Australia syenite occurs as small intrusive bodies in nearly every state. on beginning to cool, a fully molten silica-rich melt might precipitate its silica-containing components, leaving the silica-depleted melt to form a syenite afterwards. Regions where it occurs in Many different metamorphic processes can lead to episyenitization. The Burntwood Lake alkali-feldspar syenite revisited, west-central Manitoba (part of NTS 63N8) ... two syenite units is the colour of the feldspar; however, petrographic studies are pending. Syenite is not a common rock. Note that Q and F are mutually exclusive. Syenite, any of a class of intrusive igneous rocks essentially composed of an alkali feldspar and a ferromagnesian mineral. Formation of syenites are products of alkaline igneous To produce a syenite, it is necessary to melt a granitic or igneous protolith to a fairly low degree of partial melting. Most syenites are either peralkaline with high proportionsof alkali elements relative to aluminum, or per… An alkali-feldspar-syenite with 5-20% quartz on the QAPF diagram, and no foids The segregation of the silica from the melt leaves it in a state that may favour syenite formation. 4b), and unusually extensive zones of reaction around the mafic bodies, are suggestive of the coexistence of two different magmas. concentration of aluminum relative to alkali and earth-alkali elements The most notable difference is the absence or very low quantity of quartz while it is an essential component of granite. remainder of the melt. Other common accessory mineralsare apatite, titanite, zircon and opaques. potassium is an incompatible element and tends to enter a melt first, whereas occur. Syenites are usually either peralkaline with high proportions of alkali elements relative to aluminum, or peraluminous with a higher concentration of aluminum relative to alkali elements (K, Na, Ca). Aggregate, Landscaping, Making natural cement, Manufacture of Magnesium and Alkali feldspar granite. The volcanic equivalent of syenite is trachyte. Other common accessory minerals This rock type is found in a wide variety of colors. Rämö, 1991 ), and could represent the parental composition to the syenites. Episyenite (or epi-syenite) is a term used in petrology to describe the depletion of silicon dioxide (SiO2) in rock rich in silicon dioxide.[6]. A special group of alkali syenites is characterized by the presence of a feldspathoid mineral such as nepheline, leucite, cancrinite, or sodalite (see nepheline syenite). In the Kola Peninsula of Russia two giant nepheline syenite Wikipedia, The Free Encyclopedia. Group - plutonic . Less quartz content would lead to "quartz alkali feldspar syenite". nearly every state. produce plagioclase, and hence a granite, adamellite or tonalite. A true syenite (sensu stricto) is also compositionally resembling granite. https://en.wikipedia.org/w/index.php?title=Syenite&oldid=886262766, Cite this article as: Geology Science. Its name is derived from Syene, Egypt. Chemical composition. Less than that amount would designate the rock as a granite. activity, usually formed in thick continental crustal areas, or in Cordilleran Most syenites are either peralkaline with high proportions of alkali elements relative to aluminum, or peraluminous with a higher concentration of aluminum relative to alkali and earth-alkali elements (predominantly K, Na, Ca). 2nd ed. The feldspar component of syenite is predominantly alkaline in character (usually orthoclase). Syenite is a coarse-grained intrusive igneous rock of the same general composition as granite but with the quartz either absent or present in relatively small amounts (5%).. Building Stone, As Facing Stone, Paving Stone, Garden Decoration, Office These Syenite is intrusive igneous rock that basically composed of an alkali feldspar and a ferromagnesian mineral. a marginally molten rock mass may retain its unmolten silica-rich components, while the molten, silica-depleted fluid cools to form a syenite. Mineral content: orthoclase, with lesser to minor plagioclase, minor mica, augite, hornblende,magnetite etc.Silica (SiO 2) content – 60%-65%. a state that may favour syenite formation. often are interleaved as perthitic components of the rock. Syenites are products of alkaline igneous activity, generally formed in thick continental crustal areas, or in Cordilleran subduction zones. Alkali feldspar, any of several common silicate minerals that often occur as variously coloured, glassy crystals. (2020). Less quartz content would lead to “quartz alkali feldspar syenite”. subduction zones. Name origin: The name of syenite originally Syene that comes from in Egypt. Colour: variable but typically light coloured. The feldspar component of syenite is predominantly alkaline in character (usually orthoclase). minerals are present in syenite most of all, they usually occur hornblende, the Quay with Sphinxes. When ferromagnesian minerals are present in syenite at all, they usually occur in the form of hornblende, amphibole and clinopyroxene. Such feldspars often are interleaved as perthitic components of the rock. Edgeworth mine in Chesterfield, South Carolina.Syenite clasts containing The Suomenniemi alkali-feldspar syenite dikes could be related to last stages of syenite magmatism and represent intrusive dikes radiating around a concealed alkali syenite pluton. Regions where it occurs in significant quantities include the following. It is found in continental settings, and typically results from partial melting of the lower crust. This is required because The syenite intrusion shows wide variations in texture and modal compositions at outcrop scale. Syenite predominant mineral is alkaline charecter.Plagioclase feldspar may be present small amaount less than 10%. Different syenitic rock types cover large part of the diagram. Biotite is rare. Such feldsparsoften are interleaved as perthitic components of the rock. At very low degrees of partial melting a silica undersaturated melt is produced, forming a nepheline syenite, where orthoclase is replaced by a feldspathoid such as leucite, nepheline or analcime. They are used in the manufacture of glass and ceramics; transparent, highly coloured, or iridescent varieties are sometimes used as gemstones. (2019, March 5). Biotite is rare, because in a syenite magma the formation of feldspar consumes nearly all the aluminium, however less Al rich phyllosilicates may be included such as annite. The dominant mineral is alkali feldspar, usually orthoclase. Chemically, syenites comprise a slight amount of silica, incredibly big amounts of alkalies, and alumina. Texture: phaneritic (medium to coarse grained). The feldspar component of syenite is predominantly alkaline in character (usually orthoclase). Recycling: Feldspar and nepheline syenite are not recycled by producers; however, glass container producers use cullet (recycled container glass), thereby reducing feldspar and nepheline syenite consumption. Foid syenites contain significant amount of relatively rare silicate minerals known as feldspathoids (F) which are called foids for simplicity. In, Instead of the usual rock syenite, some of the more important events in New England, Arkansas, Montana, New York (syenite gneisses), Switzerland, Germany, Norway, Plovdiv, Bulgaria, Malawi (Mulanje Mountain Forest Reserve) and Romania (Ditrău). Rock, South Carolina through Taxahaw, South Carolina to the Brewer and Syenite predominant mineral is alkaline charecter. it cools. 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