Evaporitic brines and copper-sulphide ore genesis at Jbel Haïmer (Central Jebilet, Morocco)
نویسندگان
چکیده
The Jbel Haïmer copper-sulphide mineralisation occurs at 20 km north of Marrakesh in the Variscan Jebilet massif, Morocco. Most ores (up to 3.9 wt% Cu, ?38 ppm Ag, and up 2.9 Au) occur as impregnations NE-SW fault/fracture zones related tectonic breccia. Two independent stages fluid circulation mineral deposition are distinguished. First, Late high temperature-low pressure metamorphism synchronous granite intrusion induced percolation C–H-O-N hydrothermal fluids throughout faults shear zones. drop from lithostatic down hydrostatic values temperatures around 350 ± 50 °C triggered quartz precipitation associated with minor Sn-As-(Co-Ni) deposits finally brecciation. second stage, more recent than Triassic, consists + carbonates, followed by Cu-(Pb-Zn) sulphides (±Ag-Au alloys) fractures crosscutting 240 Ma microdiorite dikes. Mixing evaporitic brines likely coming Triassic formations low salinity aqueous was responsible for Cu-sulphide 220–280 a depth 4–5 km. These base metal-rich similar those nearby Roc Blanc Ag-deposit several other silver metal Morocco, considered having circulated during Central Atlantic Ocean opening.
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ژورنال
عنوان ژورنال: Ore Geology Reviews
سال: 2021
ISSN: ['0169-1368', '1872-7360']
DOI: https://doi.org/10.1016/j.oregeorev.2020.103920