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Prof. Basem Ahmed Zoheir :: Publications:

Title:
Epithermal gold mineralization at Wadi Abu Khushayba, southwestern Jordan
Authors: M. Al-Hwaiti, B. Zoheir, B. Lehmann, I. Rabba
Year: 2010
Keywords: Not Available
Journal: Not Available
Volume: Not Available
Issue: Not Available
Pages: Not Available
Publisher: Not Available
Local/International: International
Paper Link: Not Available
Full paper Basem Ahmed Zoheir_Abu Khushayba, OGR_2010.pdf
Supplementary materials Not Available
Abstract:

features of an epithermal low-sulfidation gold system. The quartz-lode and quartz-carbonate mineralization is characterized by open-space textures, typically with sharp-walled veins and multi-stage brecciation of the late Neoproterozoic (~560 Ma) rhyolitic and granophyric host rocks. Silicic alteration by cryptocrystalline quartz is abundant; potassic alteration is expressed by muscovite and K-feldspar blastesis, commonly with dispersed hematite laths. Sulfide content is low. Relict pyrite and chalcopyrite occur in comb and cockade quartz. Gold occurs disseminated in the volcanic and subvolcanic wall rocks and as late vein infill. The coexistence of vapor-rich and liquid-rich fluid inclusions in quartz, quartz textures, and the presence of adularia and calcite in the vein mineralogy suggest boiling concomitant with gold deposition in a structural setting favoring high fluid flow. Fluid inclusions in quartz define a temperature range of 350–380 °C and low salinity (~1.5–7 wt.% NaC1 equiv.) for the ore system. Pressure is estimated at 200–250 bars, indicating a maximum paleo-depth of 2500 m (hydrostatic). It appears likely that the Wadi Abu Khushayba system represents the near-surface epithermal expression of a larger unexposed mesothermal system. Such mesothermal systems are typical elsewhere in the Arabian–Nubian Shield, but are not exposed in southwestern Jordan where the present-day erosional level is close to the unconformity of the transgressive Early Cambrian platform sedimentation

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