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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.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

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.

Mineral and/or Locality  
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