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首页> 外文期刊>Contributions to Mineralogy and Petrology >The composition of brines in the early diagenetic mineralization of the Permian Kupferschiefer in Germany
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The composition of brines in the early diagenetic mineralization of the Permian Kupferschiefer in Germany

机译：德国二叠纪Kupferschiefer早期成岩成矿作用中的盐水成分

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The Kupferschiefer is an approximately 0.5 m thick black marly shale of Lower Zechstein age in Germany. If one includes some of its footwall and hanging wall, it contains 300 Mt Cu, 800 Mt Zn and 300 Mt Pb. The regional pattern of metal distribution demonstrates its relationship to Variscan and Permian tectonic structures. Faults and the topographic relief of the basement apparently controlled the uprise and lateral migration of reducing and slightly acid hot brines from deeper crustal levels to supply the metals for the mineralization of the Proto-Kupferschiefer. Deep fluids are mainly richer in Zn than Pb and richer in Pb than Cu. Mixing of such slightly acid fluids with slightly alkaline formation waters (seawater) caused a gradient in pH from about three to eight and in sulfide concentration. Most of the sulfide came from dissolved pyrite which was very light in sulfur isotopes. This gradient controlled the sequential precipitation of bornite, chalcopyrite, (chalcocite), galena and sphalerite, which is observed in a lateral and vertical zoning of these sulfides. The fluids experienced a fractionation of the metals during migration over meter to kilometer distances from the tectonically controlled vents within the unconsolidated Proto-Kupferschiefer. Close to the vents the sulfide deposits attained concentrations up to 2% Zn + Pb + Cu. The migration of the metals over large distances took place in unconsolidated sediment. Thus the major mineralization of the Kupferschiefer has to be classed as an early diagenetic process.
机译：Kupferschiefer是德国下西施泰因时代约0.5 m厚的黑色泥质页岩。如果其中包括一些底壁和悬挂壁，则其中包含300 Mt铜，800 Mt锌和300 Mt铅。金属分布的区域格局表明了其与瓦里斯坎和二叠纪构造构造的关系。地下室的断层和地形起伏明显地控制了来自较深地壳水平的还原性和微酸性热盐水的上升和横向迁移，从而为原库珀费尔舍夫矿化提供了金属。深层流体中锌的含量主要高于铅，而铅的含量则高于铜。将这种弱酸性流体与弱碱性地层水（海水）混合会导致pH值从约3到8的梯度以及硫化物浓度的梯度。大部分硫化物来自溶解的黄铁矿，在硫同位素中非常轻。该梯度控制了褐铁矿，黄铜矿，（方铅矿），方铅矿和闪锌矿的顺序沉淀，这在这些硫化物的横向和垂直分区中都可以观察到。流体在未固结的Proto-Kupferschiefer内从构造控制的喷口向米至千米的距离迁移过程中经历了金属的分馏。在排气孔附近，硫化物沉积物的浓度最高可达2％Zn + Pb + Cu。金属的长距离迁移发生在未固结的沉积物中。因此，Kupferschiefer的主要矿化必须归类为早期成岩作用。

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