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Tin-Amzi granite dome, Ahaggar Mtn (Hoggar Mtn), Tamanghasset Province, Algeria

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Intrusive F/Li/Na/K-rich leucogranite (525-538 My) dome in granulitic gneisses.
Topaz (F)-muscovite (Li) granite in the deep parts of the cupola, topaz-zinnwaldite granite in the upper parts of the intrusion.
Frequent dykes of topaz-muscovite porphyric microgranite above the cupola.
These microgranites show miarolitic cavities with cassiterite (Ta), wolframoixiolite, ferberite and scheelite.
Late tardimagmatic evolution of granites :
- Mobilization (by vapor fluids) of Sn in the miarolitic system.
- Transfer of W (liquid phase) in granites.
- REE are extracted by fluids from the deeper parts of the cupola and reconcentrated at the top of the intrusion.
- Loss of F and Li in topaz-muscovite granites and microgranites (extraction by a liquid phase).

Mineral List

23 entries listed. 12 valid minerals.

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Kesraoui, M. (1990). Greisenisation et minéralisations W-Sn à Tin-Amzi (Hoggar central). Typomor-phisme des minéraux et aspect géochimiques (Doctoral dissertation, Thèse de Magister, IST/UST 1-1. B.. 180p).

Suzaki, R., Kolli, O., Mokrane, K., Boutaleb, A., Taguchi, S., Yonezu, K., & Watanabe, K. (2013) Granite Related Mineralization of Tungsten in Hoggar, Southern Algeria. ASEAN Paper ID 109

Kesraoui, M., & Nedjari, S. (2002). Contrasting evolution of low-P rare metal granites from two different terranes in the Hoggar area, Algeria. Journal of African Earth Sciences, 34(3), 247-257.

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