Syenite - Wikipedia
网页Syenites are products of alkaline igneous activity, generally formed in thick continental crustal areas, or in Cordilleran subduction zones. The formation of syenites can be theorized to be from the melt of granitic or igneous protolith to a fairly low degree of partial melting.
Syenite : Formation, Composition, Classification, Uses - Geology …
网页2023年10月20日 · Syenite is a coarse-grained, plutonic (intrusive) igneous rock that primarily consists of the minerals feldspar, typically orthoclase feldspar, and often includes smaller amounts of other minerals such as hornblende, mica, or amphibole.
Syenite | Igneous, Intrusive, Plutonic | Britannica
网页Syenite, any of a class of intrusive igneous rocks essentially composed of an alkali feldspar and a ferromagnesian mineral. 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).
Syenite - Igneous Rocks - Sandatlas
网页Syenite is an igneous rock that solidified slowly in the crust in a similar manner to granite. A true syenite (sensu stricto) is also compositionally resembling granite. The most notable difference is the absence or very low quantity of quartz while it …
正长岩 - 百度百科
网页英文名syenite一词来自埃及地名Syene，原指该地所产的红色粗粒角闪石黑云母花岗岩。将此名用来称呼缺少石英的由角闪石和长石组成的结晶岩石
Syenite: A Coarse-grained Granite-Like Plutonic Rock
网页2023年7月6日 · Syenite is a coarse-grained, mostly light-colored intrusive rock with an intermediate to felsic composition. It has mainly alkali feldspar, lesser plagioclase, and one or more mafic minerals. Also, it may have a small amount of quartz.
碱性正长岩_百度百科
网页碱性正长岩（alkali feldspar syenite）又称含副长石碱性正长岩（foid bearing alkali syenite），是一种以碱性长石为主，而暗色矿物为碱性辉石或碱性角闪石的正长岩。.
Syenite - an overview | ScienceDirect Topics
网页Syenite is a coarsely crystalline plutonic intermediate rock consisting chiefly of alkali feldspar with less than 5% quartz and/or feldspathoid. Clinopyroxene, hornblende, biotite mica, or olivine may be present in minor proportions.
Syenite - Encyclopedia.com
网页2018年5月8日 · syenite A saturated, coarse-grained, igneous rock consisting of essential alkali feldspar and ferromagnesian minerals (biotite, hornblende, arfvedsonite, aegirine-augite, and/or aegirine) and accessory apatite, zircon, and iron oxides. The feldspar constitutes more than 65% of the rock.
Syenite - SpringerLink
网页Syenites are holocrystalline coarse- to medium-grained intermediate igneous rocks in which the dominant mineral is alkali feldspar. Most syenites are hypersolvus rocks in which the feldspar is micro- or cryptoperthitic alkali feldspar (“alkali feldspar syenite” of Streckeisen, 1976) but two-feldspar (i.e., subsolvus) syenites with albite ...
- 某些结果已被删除