The juxtaposition of a Triassic evaporite diapir with the organic matter-rich Fahdene Formation (Albian-Vra-conian) along major faults in the Slata ore district raises the question of the roles played by halokinesis, hydrocarbons, and tectonics in mineralization. The Slata mining district, located in the Tunisian salt diapiric zone, contains Ba-Pb-(± Zn) ore hosted in the Aptian carbonates. The mineralogical paragenetic sequence consists of barite (Ba-1)–galena ± sphalerite ± calcite (Ca-1)–barite (Ba-2) and finally, late calcites (Ca-2 and Ca-3). Fluid inclusions from early barite reveal that it was precipitated from a warm (134°–157°C), H₂O-NaCl-KCl-CaCl₂, moderately saline (13.3–24.6 wt % NaCl equiv) basinal brine. This fluid is thought to have resulted from the mixing of a deep-seated, hot, metal-bearing fluid with a cooler, dilute SO42−-rich fluid. Early calcite and cogenetic sulfides (galena and sphalerite) precipitated from fluids of similar salinities and temperatures as the barite-forming fluids, but with the additional involvement of hydrocarbons. Sulfur isotope data suggest that thermochemical sulfate reduction of Triassic gypsum was the main source of reduced sulfur for sulfides. Late barite precipitated as a result of the mixing between a Ba-rich, hot, ascending fluid with a cooler, dilute Triassic sulfate-rich fluid in the absence of hydrocarbons. The homogeneous Pb isotope compositions of galena along with the Sr isotope compositions of barite point to a Paleozoic reservoir as the main source of metals with a contribution from the Triassic-Cretaceous rocks. The emplacement of the ore occurred during the Eocene-Miocene Alpine compressional tectonic activity that triggered the circulation of Paleozoic-derived metal-bearing fluids.

中文翻译：

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突尼斯Slata地区与盐Diapir相关的密西西比河谷型Ba-Pb-（±Zn）矿石的成因：晕岩作用，碳氢化合物迁移和高山造山作用

在Slata矿区的主要断层上，三叠纪蒸发岩底辟与富有机质的Fahdene组（Albian-Vra-conian）并置，提出了卤代动力学，碳氢化合物和构造在成矿作用中的作用的问题。位于突尼斯盐底界的Slata矿区含有Aptian碳酸盐中的Ba-Pb-（±Zn）矿石。矿物学上的共生序列由重晶石（Ba-1）–方铅矿±闪锌矿±方解石（Ca-1）–重晶石（Ba-2）组成，最后是晚方解石（Ca-2和Ca-3）。早期重晶石的流体包裹体表明它是从温暖的（134°–157°C）H ₂ O-NaCl-KCl-CaCl ₂沉淀出来的。，中度盐水（相当于当量NaCl的13.3–24.6 wt％）盆地盐水。这种流体被认为是由深层的，热的，含金属的流体与较冷的，稀的富含SO42-的流体混合而成的。早期方解石和共生硫化物（方铅矿和闪锌矿）是从盐度和温度与重晶石形成的流体相似的流体中沉淀出来的，但还涉及到碳氢化合物。硫同位素数据表明，三叠纪石膏的热化学硫酸盐还原是硫化物还原硫减少的主要来源。在不存在烃类的情况下，由于富Ba的热上升流体与较冷的稀Triassic富硫酸盐流体之间的混合，导致后期重晶石沉淀。方铅矿的均匀Pb同位素组成以及重晶石的Sr同位素组成指向古生界储层，作为三叠系-白垩纪岩石的主要金属来源。矿石的堆积发生在始新世-中新世高山压缩构造活动中，该活动触发了古生代含金属流体的循环。