Massive Zn‐Pb‐Ag sulfide mineralization appears conformable with felsic volcanism, developed in an Upper Jurassic volcanic arc to the Southwest (SW) of the Serbo‐Macedonian continent in Northern Greece. The host volcanic sequence of the mineralization comprises mylonitized rhyolitic to rhyodacitic lavas, pyroclastics, quartz‐feldspar porphyries, and cherty tuffs. A “white mica—quartz—pyrite” mineral assemblage characterizes the volcanic rocks in the footwall and hanging‐wall of massive sulfide ore layers, formed as a result of greenschist‐grade regional metamorphism on “clay‐quartz‐pyrite” hydrothermal alteration haloes. Massive ore lenses are usually underlain by deformed Cu‐pyrite and quartz‐pyrite stockworks. Most of the sulfide ore bodies have proximal‐type features. Ductile deformation and regional metamorphism have transformed many of the stockwork structures. The mineralization is characterized by high Zn, Pb, and Ag contents, while Cu and critical metals are low. Primary depositional textures, for example, layering, clastic pyrite, colloform, and atoll textures were identified. The overall textural features of the mineralization indicate it has undergone mechanical deformation. The most prominent features of the effects of metamorphism, folding and shearing, are modification of the ore body morphology toward flattened and boudinage structures and transformation of the ore textures toward the dominance of planar fabrics. Sulfur isotope analyses of sulfides along with textural observations are consistent with a dual source of sulfide sulfur. Sulfur isotope values for sphalerite, non‐colloform pyrite, galena, and chalcopyrite fall in a limited range from −1.6 to +4.8‰ (mean δ³⁴S + 2‰), indicating a hydrothermal source derived from the reduction of coeval seawater sulfate in the convective system. Pyrites with colloform and atoll textures are characterized by a ³⁴S depletion, indicating a bacterial reduction of coeval seawater sulfate. The morphology of ore beds, the mineralogy, sulfide textures, and ore chemistry along with the petrology and tectonic setting of the host rocks can be attributed to typical of a bimodal‐felsic metallogenesis. Although similar in many respects to classic Kuroko‐type volcanogenic massive sulfide mineralization, it has some atypical features, like the absence of barite ore, which is possibly a result of significant temporal depletion in sulfate due to bacterial reduction, a conclusion supported by the widespread occurrence of colloidal and atoll textures of pyrite.

中文翻译：

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与弧型火山作用有关的侏罗纪大规模Zn-Pb-Ag硫化物矿化的背景，硫同位素变化和变质作用（Skra，Vardar带，北希腊）

大量的Zn-Pb-Ag硫化物矿化似乎与长石质火山相符，长石质火山是在希腊北部的塞尔维亚-马其顿大陆西南（SW）的上侏罗世火山弧中发育的。矿化的主火山序列包括流纹岩化至流纹岩化熔岩，火山碎屑岩，石英长石斑岩和乳浊凝灰岩。“白云母-石英-黄铁矿”矿物组合表征了块状硫化矿层下壁和悬挂壁中的火山岩，这是由于对“粘土-石英-黄铁矿”热液蚀变晕的绿片岩级区域变质作用而形成的。大型矿石透镜通常在变形的铜黄铁矿和石英黄铁矿仓库的下方。大多数硫化物矿体具有近端型特征。延性变形和区域变质作用改变了许多储层结构。矿化的特点是锌，铅和银的含量高，而铜和关键金属的含量低。确定了主要的沉积质地，例如分层，黄铁矿碎屑，共形岩和环礁质地。矿化的总体质地特征表明它已发生机械变形。变质作用，折叠作用和剪切作用的最突出特征是，矿石体形态向扁平化和包结结构的改变，以及矿石质地向平面织物的主导地位的转变。硫化物的硫同位素分析以及组织观察与硫化物硫的双重来源是一致的。闪锌矿，非胶状黄铁矿，方铅矿，³⁴ S + 2‰），表示对流系统中的同代海水硫酸盐还原产生的水热源。具有波纹状和环礁质地的黄铁矿的特征是³⁴S耗尽，表明细菌减少了同时代的海水硫酸盐。矿床的形态，矿物学，硫化物的质地，矿石化学以及宿主岩的岩石学和构造背景可归因于典型的双峰长生期成矿作用。尽管在许多方面都与经典的黑口子式火山成矿块状硫化物矿化相似，但它具有一些非典型特征，例如不存在重晶石矿石，这可能是由于细菌减少导致硫酸盐的时间显着减少的结果，这一结论得到了广泛的支持。黄铁矿的胶体和环礁质地的发生。