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Conditions of Ore-Mineralization and Geochemical Correlation of Rare-Elements at the Robat Pb-Zn Deposit, West of Khomein, Central Iran

机译:伊朗中部霍梅宁以西Robat Pb-Zn矿床的矿石矿化条件和稀土元素的地球化学关系

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The Robat geological study area is located 32 Km west-northwest of Khomein town. From the geo-structural point of view, it is in the median part of the Sanandaj-Sirjan zone [1], and from the mineralization aspect it is part of the Malayer-Esfahan Pb-Zn metallogenic belt [2]. The main hostrock of Pb-Zn ore-mineralization at the Robat deposit is the upper parts of the orbitolina-bearing limestone at its contact with the overlying unit of marl. Ore mineralization is characterized by vein-veinlet, fracture-filling and replacement textures, associated with silica, carbonate, argillic and hematitic alterations [3]. Geochemical trends of minor elements in ore represent positive correlation of Sb, Ag, Cu, Bi, Sn, Fe, U, Th, W, V, Zr and Y with Pb and Zn. Fluid inclusion study of samples indicates that primary fluid inclusions mainly consist of liquid, having an average temperature of homogeneity in the range of 160°C to 270°C, having the most frequency in the range of 180°C to 190°C at an average of 5 to 10 wt% NaCl equivalent for salinity. Based on the graph of pressure variations versus salinity (representing paleo-depth), it is understood that ore-mineralization at the Robat deposit is estimated to have formed at less than 50 bars pressure representing depths shallower than 200 m. Fluid inclusion study renders that the low salinity could be resulted from dilution by meteoric waters, also indicating that boiling could be the major mineral precipitation process. Therefore, it is concluded, based on these studies, besides field evidence, that the Robat Pb-Zn deposit shows strong affinity with MVT Pb-Zn mineralization type.
机译:罗巴特地质研究区位于霍梅宁镇西北西北32公里处。从地质构造的角度来看,它位于Sanandaj-Sirjan带的中部[1],从成矿作用来看,它是Malayer-Esfahan Pb-Zn成矿带的一部分[2]。 Robat矿床中Pb-Zn矿石矿化的主要地层是与石灰岩上覆单元接触的含眶石的石灰岩的上部。矿石矿化的特征是脉状小孔,裂缝充填和置换质地,伴有二氧化硅,碳酸盐,泥质和半矿物的变化[3]。矿石中微量元素的地球化学趋势表明Sb,Ag,Cu,Bi,Sn,Fe,U,Th,W,V,Zr和Y与Pb和Zn正相关。样品的流体包裹体研究表明,一次流体包裹体主要由液体组成,平均温度在160°C至270°C的范围内均匀,最高频率在180°C至190°C的范围内。盐度平均为5-10 wt%NaCl当量。基于压力变化与盐度的关系图(代表古深度),可以理解的是,据估计在Robat矿床的矿化作用是在小于50 bar的压力下形成的,代表的深度小于200 m。流体包裹体研究表明,低盐度可能是由流域水稀释造成的,也表明沸腾可能是主要的矿物沉淀过程。因此,基于这些研究,除现场证据外,得出的结论是,Robat Pb-Zn矿床显示出与MVT Pb-Zn矿化类型的强亲和力。

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