Aïn Barbar, Edough-Cap de Fer Massif, Constantine District, Constantine Province, Algeria
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|Location is approximate, estimate based on other nearby localities.|
|Latitude & Longitude (WGS84):||36° North , 6° East (est.)|
|Margin of Error:||~36km|
|Köppen climate type:||Csa : Hot-summer Mediterranean climate|
Located in the NE of the Constantine District.
Langhian (16-15 My) terrestrial palaeogeothermal field (stratified aquifer) with polymetallic Fe/Zn/Cu/Pb-veins.
Host rocks : Nappe of Numidian clay-quartz oligo-miocene flysch and Cretaceous clay-carbonate flysch (deeply altered by the high energy geothermal system).
The flyschs are crosscut by microgranite and rhyolite dykes ; propylitic, sericitic and potassic alteration.
The silification is important.
The vein mineralization is located in shear zones (Playfair and Abaïd veins), it is quite complex:
- Early stage
- Main stage
Sphalerite, pyrrhotite H
Quartz (silicification), chlorite, phengite
Illite, chalcopyrite, pyrrhotite M
- Late stage
Vein breccia fillings, comb quartz with microcrystalline quartz and chalcedony.
Evolution : 130-80 bars, 320-180°C.
27 valid minerals.
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- Marignac, Ch. (1988): Bull. Minéral., 111, 359-381.