Trachybasalt

A variety of trachybasalt from Yamalo-Nenets Autonomous Okrug in Russia, known there as enzorite

Satellite image of Bayuda volcanic field in Sudan where nepheline-rich trachybasalt lavas have been erupted during the Holocene epoch^[1]

Trachybasalt is a volcanic rock with a composition between trachyte and basalt. Minerals in trachybasalt include alkali feldspar, calcic plagioclase, olivine, clinopyroxene and likely very small amounts of leucite or analcime.^[2] Trachybasalt is a basalt with high alkali content (5 to 7% Na₂O + K₂O, see TAS diagram).

References[]

^ "Bayuda Volcanic Field". Global Volcanism Program – Volcanoes of the World database. Smithsonian Institution. 5 June 2020. Retrieved 6 August 2020.
^ Trachybasalt

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v t Types of basalts
Basalts by tectonic setting	Flood basalt Mid-ocean ridge basalt Ocean island basalt Volcanic arc basalt
Basalts by form and flow	Columnar basalt Pillow basalt Aa lava Pahoehoe lava
Basalts by chemistry	Tholeiitic basalt Calc-alkaline basalt Alkali basalt Trachybasalt Hawaiite Mugearite Picrite basalt
Important minerals	Olivine Pyroxene Plagioclase Amphibole Magnetite Ilmenite Quartz Cristobalite Tridymite

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Volcanic rocks	Agglomerate Andesite Basalt Basaltic andesite Benmoreite Blairmorite Cinder Dacite Felsite Komatiite Latite Leucitite Nephelinite Obsidian Phonolite Phonotephrite Pumice Rhyodacite Rhyolite Tephriphonolite Trachyandesite Trachybasalt Trachyte Tuff
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