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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, sphalerite
Quartz (silicification), chlorite, phengite
Illite, chalcopyrite, pyrrhotite M
Pyrite, calcite
- Late stage
Vein breccia fillings, comb quartz with microcrystalline quartz and chalcedony.
Quartz, adularia
Calcite, chlorite
Phengitic illite
Various sulfides

Evolution : 130-80 bars, 320-180°C.

Mineral List

27 valid minerals.

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- Marignac, Ch. (1988): Bull. Minéral., 111, 359-381.

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