Alkaline Rocks and Carbonatites of the World

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Hoggar (Ahaggar) Recent Volcanism

Hoggar (Ahaggar) Recent Volcanism

The volcanism of the Hoggar extends for over 500 km from southwest to northeast. The area is located on a large lithosphere swell of some 1000 km diameter and one kilometre amplitude (Brown and Girdler, 1980). There are five principal volcanic districts namely, Adrar n'Ajjer, Eggere, Anahef, Atakor and Tahalra. All but Anahef are dominated by alkali basaltic and trachytic volcanism; each of these centres is described separately (Nos 003-00-004 to 003-00-008). Anahef includes a number of intrusive centres, which are described individually. A general description of the deep structure of the Hoggar dome, based on geophysical and petrological data, is given by Lesquer et al. (1988), and Dautria and Girod (1991) discuss the relationship between the regional volcanism and mantle heterogeneity.

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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith