Trachyandesite is an extrusive igneous rock with a composition between trachyte and andesite. It has little or no free quartz, but is dominated by sodic...

targets – Basaltic lava with a flowing, often ropy appearance Basaltic trachyandesite – Naming system for volcanic rocksPages displaying short descriptions...

example in the intrusive dioritic pluton of El Teniente, Chile and in trachyandesite pumice erupted by El Chichón volcano, Mexico. The name anhydrite was...

Trachybasalt. S2 (Basaltic trachyandesite)—*Sodic and potassic variants are Mugearite and Shoshonite. S3 (Trachyandesite—*Sodic and potassic variants...

mafic compositions. Typical intermediate rocks include andesite and trachyandesite among volcanic rocks and diorite and granodiorite among plutonic rocks...

rock. More specifically, it is a potassium-rich variety of basaltic trachyandesite, composed of olivine, augite and plagioclase phenocrysts in a groundmass...

identified as plagioclase basalt, but now reclassified as basaltic trachyandesite to trachyandesite. The third phase, from 2.75 to 2.52 million years ago, completed...

granite Anorthosite Aplite Basalt Alkali basalt Picrite basalt Basaltic trachyandesite Mugearite Shoshonite Basanite Blairmorite Boninite Carbonatite Charnockite...

basalt-trachybasalt-trachyandesite volcanoes (Ngorongoro also contains trachydacite) and the 1.6-1.5 Ma Oldeani basalt-trachyandesite volcano. The highlands...

million years ago in 5,000 years ago. The island consists primarily of trachyandesite rock. A major explosive eruption around 8000 BCE decapitated its top...