Modelling of an MVT deposit: Touissit-Bou Beker district (eastern Morocco)

Hydrothermal macroscopic Fe-sepiolite from Oujda Mounts (Middle Atlas, Eastern Morocco)

“…The development of low-temperature hydrothermal systems associated to the rifting events during the evolution of the Central Atlantic magmatic province has been studied in several areas of the Middle Atlas (Auajjar and Boulègue, 2002;Makhoukhi et al, 2000Makhoukhi et al, , 2003 and in the Jebilet mountains (Valenza et al, 2000). In the surroundings of the studied area, these hydrothermal systems were responsible for Pb-Zn mineralizations in the Touissit-Bou Table 3) in a (Al + Fe) VI vs Mg (per formula unit) plot for the analysed sepiolite fibres.…”

“…Bekker (Makhoukhi et al, 2000(Makhoukhi et al, , 2003 and Tazekka (Auajjar and Boulègue, 2002) districts, accompanied by extensive dolomite precipitation and recrystallization. The fluids involved in this process had high salinity, temperatures in the 100-135°C range (Makhoukhi et al, 2003) and were Mg-rich, as supported by the common precipitation or recrystallization of dolomite; these features were acquired during downwards flow of sedimentary-diagenetic waters throughout the Triassic-Jurassic series (Makhoukhi et al, 2000). These hydrothermal systems were variably active during the Jurassic and, given the composition and thermal conditions of the fluids, are compatible with the development of Fe-sepiolite mineralization in veins.…”

Origine du soufre associé aux minéralisations Pb-Zn de type Mississippi Valley de la chaîne des Beni Snassen orientaux (Maroc nord-oriental)

“…The mineralization occurs either as disseminated or open space filling sulfide ore in the Lower Liassic-Carixian carbonate rocks. The close spatial association of the ore bodies to the Late Hercynian Beni Snassen granite led some authors to consider these MVT prospects to be genetically related to the intrusions [3,10]. The objectives of this sulfur isotope study were to determine the source of sulfur and the process responsible for the deposition of lead-zinc ores.…”

“…L'association spatiale des MVT avec les granitoïdes tardi-hercyniens a poussé bon nombre d'auteurs à considérer ces gisements comme étant issus des processus épithermaux, directement ou indirectement connectés à la mise en place des corps magmatiques [3,10].…”