BackgroundThe elongated, E-W-trending Tahalra volcanic field covers an area of about 1800 sq km in the Hoggar Province of southern Algeria. The large volcanic field lies WSW of the town of Tamanrasset and was active from the Miocene to the Holocene, producing alkaline strombolian cones and lava flows. The high point of the volcanic field, which was constructed over a basement of Precambrian metamorphic and plutonic rocks of the Tuareg shield, lies near its eastern end. A dozen trachytic-to-rhyolitic lava domes and spines formed during the Pliocene, and Pliocene-to Pleistocene activity formed about 100 small strombolian basaltic (mostly basanitic) cones. The most recent activity during the Pleistocene and Holocene produced about 20 maars and cones along the northern margin of the volcanic field.
Smithsonian / GVP volcano information
See also: Sentinel hub | Landsat 8