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The Wadi Bayhan mafic-ultramafic intrusions associated with magmatic PGE-bearing Cu-Ni sulphide deposit are located in the south margin of the Arabian-Nubian Shield,SW Yemen.The intrusions consist of dunite,olivine-pyroxenite,lherzolite,hornblendite,gabbro and gabbronorite.The dunite and lherzolite are the main host rock for the Cu-Ni ores.The new data of the chemical compositions of the rocks have SiO2(50%-53.6%),Al2O3(0-32%) and MgO(4%-28%),and relatively low TiO2(0-3.2%) and K2O+Na2O(0.04%-5.2%).The geochemical characteristics indicate that the parental magma is high-magnesium tholeiitic.Sulfur had reached saturation and immiscible sulfides droplets segregated from silicate magmas before their emplacement.
The Wadi Bayhan mafic-ultramafic intrusions associated with magmatic PGE-bearing Cu-Ni sulphide deposits are located in the south margin of the Arabian-Nubian Shield, SW Yemen. The intrusions consist of dunite, olivine-pyroxenite, lherzolite, hornblendite, gabbro and gabbronorite.The dunite and lherzolite are the main host rock for the Cu-Ni ores. The new data of the chemical compositions of the rocks with SiO2 (50% -53.6%), Al2O3 (0-32%) and MgO (4% -28%), and relatively low TiO2 (0-3.2%) and K2O + Na2O (0.04% -5.2%). The geochemical characteristics indicate that the parental magma is high-magnesium tholeiitic. Sulfur had reached reached saturation and immiscible sulfides droplets segregated from silicate magmas before their emplacement.