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Tahalra Volcanic Field

Medan gunung api · Algeria · 1467 m

The dark-green and bluish-gray areas extending across this NASA Landsat false-color image depict the elongated, E-W-trending Tahalra volcanic field, which covers an area of about 1,800 km2 in the Hoggar Province of southern Algeria. About 100 small basaltic cones formed during the Pliocene and Pleistocene, and the most recent activity during the late-Pleistocene and Holocene, produced about 20 maars and cones along the northern margin of the volcanic field.
The dark-green and bluish-gray areas extending across this NASA Landsat false-color image depict the elongated, E-W-trending Tahalra volcanic field, which covers an area of about 1,800 km2 in the Hoggar Province of southern Algeria. About 100 small basaltic cones formed during the Pliocene and Pleistocene, and the most recent activity during the late-Pleistocene and Holocene, produced about 20 maars and cones along the northern margin of the volcanic field. · Foto: NASA Landsat 7 image (worldwind.arc.nasa.gov) · Wikimedia Commons
Tipe
Medan gunung api
Negara
Algeria
Wilayah
Northern Africa Volcanic Regions / West Central Sahara Volcanic Province
Ketinggian
1467 m
Koordinat
22.670, 5.000
Letusan terakhir
Tidak diketahui
Kondisi tektonik
Intraplate / Continental crust (> 25 km)
Bentuk lahan
Cluster
Batuan utama
Trachybasalt / Tephrite Basanite
Ringkasan geologi

The large E-W elongated Tahalra volcanic field covers an area of about 1,800 km2 in the Hoggar Province of southern Algeria. It lies WSW of the town of Tamanrasset and was active from the Miocene to the Holocene, producing alkaline Strombolian cones and lava flows. The field was constructed over Precambrian metamorphic and plutonic rocks of the Tuareg shield. A dozen trachytic-to-rhyolitic lava domes and spines formed during the Pliocene, and Pliocene-to Pleistocene activity formed about 100 small basaltic (mostly basanitic) cones. The most recent activity, during the Pleistocene and Holocene, produced about 20 maars and cones along the northern margin.

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