Trachyte is the usual silica-rich end member of the alkaline magma series, in which alkaline basaltic magma experiences fractional crystallization while still underground.
What is trachyte made of?
trachyte, light-coloured, very fine-grained extrusive igneous rock that is composed chiefly of alkali feldspar with minor amounts of dark-coloured minerals such as biotite, amphibole, or pyroxene. Compositionally, trachyte is the volcanic equivalent of the plutonic (intrusive) rock syenite.
What type of rock is Peralkaline trachyte?
A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium. A petrological term for Albite-Anorthite Series.
Is trachyte porphyry intrusive or extrusive?
Trachyte is an extrusive rock, belonging to the alkali series of intermediate volcanic rocks.
Where can you find trachyte?
continental sector
Trachytes are more abundant in the continental sector, and rhyolites are completely absent from the oceanic sector.
What type of rock is trachyte porphyry?
igneous rock
An igneous rock, trachyte primarily consists of alkali feldspars, but also contains plagioclase as well as minor amounts of other minerals, such as olivine, biotite, and pyroxene.
What is Peralkaline granite?
Aplites are equigranular granitic rocks with little mafic component occurring in veins or dykes. Granophyres are granitic rocks in which quartz and feldspar has a granophyric intergrowth.
Is trachyte porphyry felsic or mafic?
Igneous Rocks
| Atlas of Igneous Rocks | ||
|---|---|---|
| Rock Name / Image | Texture | Composition |
| Basalt: Olivine Basalt Porphyry | Porphyritic | Mafic |
| Bostonite (Trachyte Porphyry) | Porphyritic | Intermediate |
| Carbonatite: Siderite Carbonatite | Phaneritic | Ultramafic |
Is trachyte a mineral or a rock mineral rock submit?
Trachyte is a extrusive igneous rock that light coloured is composed mostly of alkali feldspar with minor amount of dark coloured minerals such as biotite, amphibole, or pyroxene. Trachyte is the volcanic equivalent of rock Syenite.
What is alkaline stone?
alkaline rock, any of various rocks in which the chemical content of the alkalies (potassium oxide and sodium oxide) is great enough for alkaline minerals to form. Such minerals may be unusually sodium rich, with a relatively high ratio of alkalies to silica (SiO2), as in the feldspathoids.
