Genesis of the metamorphosed Um Zeriq Zn-Pb-As-Ag prospect, Sinai, Egypt

摘要

Sub-economic Zn-Pb-As-Ag mineralization occurs in the Um Zeriq area that forms part of the polydeformed and medium-grade metamorphosed Wadi Kid metamorphic complex of southern Sinai, Egypt. The host rocks and the individual sulfide ore minerals have been intensely affected by metamorphism and de-formational events, resulting in total obliteration of primary textures and the formation of textural and minera-logical modifications typical of metamorphosed base metal sulfide deposits. The complete transformation of the silicate mineral assemblage, in the vicinity of the sulfide mineral phases, to chlorite and the reconcentra-tion of the original disseminated mineralization to massive sulfide bodies suggest extensive involvement of metamorphic fluids. The preserved fabric is of a retrograde character, and the overall structural and textural relationships favor syntectonic formation during the main phase of deformation. Silver minerals suggest formation at low temperatures during retrograde cooling.