تعيين منشأ فلزات كانسارهاي روي و سرب با سنگ ميزبان كربناتي در ناحيه كوهبنان -بهباد: شواهد كاني شناسي ژئوشيميايي و الگوي عناصر كمياب خاكي

Metal source determination of carbonate-hosted zinc-lead deposits in the Kuhbanan-Bahabad area: evidence from mineralogy, geochemistry and rare earth elements patterns

The zinc-lead deposits of Kuhbanan-Bahabad are situated in the Upper Permian carbonate rocks. Petrography studies on the carbonate host-rocks shows that these rocks, opposite to the other carbonates of the stratigraphy succession, have considerable primary auto morph sulfide minerals. Morphological and textural relations show that these minerals forms during primary to late stages of diagnosis. In some cases, frequency of sulfide minerals exceeds up to 5%. Geochemical studies on various rock types of foot-wall, host-rock and hanging-wall reveals that the host-rock has a unique chemical characteristic. High metal contents and similarity of rare earth elements (REEs) distribution patterns between ore types and host-rock shows that the metals originated from the host-rock. Local surveys in the mineralized area show contemporaneous exhalation with host-rock formation and caused metal enrichments of Upper Permian sediments. In turn, source rock and host-rock of these ore deposits are the same rocks and these roles were played by the Upper Permian carbonate rocks.