Fine grained igneous rock than contains less than 90 percent mafic minerals, less than 10 percent feldspathoid mineral and less than 20 percent quartz in the QAPF fraction and has a plagioclase to total feldspar ratio less than 0.65. Mafic minerals typically include amphibole or mica; typically porphyritic. Includes rocks defined modally in QAPF fields 6, 7 and 8 (with subdivisions) or chemically in TAS Field T as trachyte or latite.
LeMaitre et al. 2002
See Also: basaltic-trachyandesite, trachyte(TAS), benmoreite, hawaiite, mugearite, potassic-trachybasalt, shoshonite, trachyandesite, trachybasalt, trachydacite
Parents: Fine grained igneous rock (86)
Children: Alkali feldspar trachytic rock (9); Latitic rock (154); Trachytic rock (257)
[Description taken from GeoSciML SimpleLithology201012.rdf]
Category: Analysed material
The different kinds of sample material collected in the field have been classified hierarchically. Examples: “till”, “soil”, “vegetation”. Taken from the “Sample_Types_SHARED” database table.
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