Emi Koussi
Koussi, Emi
Shield volcano · Chad · 3415m
- Type
- Shield volcano
- Country
- Chad
- Region
- Northern Africa Volcanic Regions / East Central Sahara Volcanic Province
- Elevation
- 3415m
- Coordinates
- 19.800, 18.530
- Last eruption
- Unknown
- Tectonic setting
- Intraplate / Continental crust (> 25 km)
- Landform
- Shield
- Major rock type
- Trachyte / Trachydacite
Geological summary
The large Emi Koussi volcano at the SE end of the Tibesti Range, a 60 x 80 km massif constructed over a basement of Cretaceous and Paleozoic sandstones, forms the highest summit of the Sahara. Two nested calderas, 12 x 15 km, truncate the dominantly trachytic volcano, whose high point lies on the southern caldera rim of the low-angle pyroclastic shield volcano. The calderas contain several explosion craters, lava domes, and young scoria cones, along with lava flows of recent and pre-modern age (Geze et al., 1959). The Era Kohor (Trou au Natron du Koussi) caldera on the SE floor of the 2nd caldera is 2-3 km wide and 350 m deep. The latest activity in the calderas produced three maars, and numerous basaltic cinder cones; associated lava flows have been constructed both within the calderas and on their outer flanks. The Yi-Yerra thermal area is located on the S flank.
From Wikipedia
Emi Koussi is a high pyroclastic shield volcano that lies at the southeast end of the Tibesti Mountains in the central Sahara, in the northern Borkou Region of northern Chad. The highest mountain of the Sahara, the volcano is one of several in the Tibesti range, and reaches an elevation of 3,447 metres (11,309 ft), rising 3 km (1.9 mi) above the surrounding sandstone plains. The volcano is 60–70 kilometres (37–43 mi) wide and has a volume of 2,500 cubic kilometres (600 cu mi).
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Eruption history
Detailed timeline
No eruption records available.
External links
⚠ For reference only. Not for emergency response.