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The role of organic matter during copper enrichment in Kupferschiefer from the Sangerhausen basin, Germany

机译:有机物在德国桑格豪森盆地库珀费尔西弗铜富集过程中的作用

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In a previous study (Sun, Y.-Z., Puttmann, W., 1997, Metal accumulation during and after deposition of the Kupferschiefer from Niederroblingen, Sangerhausen basin, Germany. Applied Geochemistry 12, 577-592) Cu enrichments of up to 20% in the Kupferschiefer have been reported from the Sangerhausen basin, Germany. Petrological and geochemical analyses have shown that Cu was precipitated by two different processes: pyrite replacement (PR) and thermochemical sulfate reduction (TSR). In the present study, the composition of the organic matter has been studied in a profile from the Sangerhausen basin in order to estimate the amount of Cu precipitated by PR and by TSR. Analyses of the soluble organic matter, by GC and GC/MS, and of kerogen by Rock-Eval pyrolysis, indicated that PR is responsible for Cu precipitation with enrichments of less than 8%. Organic matter is not involved in PR but is required as hydrogen donor in the thermochemical formation of H2S through sulfate reduction. In a sample from the bottom section of the Kupferschiefer, with 19.88% Cu, the degree of hydrogen depletion in the organic matter allows one to assess the amount of Cu precipitated by TSR to be approximately 12% (60% of the total Cu). Saturated and aromatic hydrocarbons, kerogen, and possibly methane served as hydrogen donors for TSR. The results argue for stepwise precipitation of Cu sulfides during diagenesis of the shale. First, Cu is precipitated during pyrite replacement, and when the reduced S stored in the sediment is used up, additional H2S is generated by TSR. (C) 2000 Elsevier Science Ltd. All rights reserved. [References: 28]
机译:在以前的一项研究中(Sun,Y.-Z.,Puttmann,W.,1997,来自德国桑格豪森盆地Niederroblingen的Kupferschiefer沉积过程中和沉积后的金属累积。应用地球化学12,577-592)据报道,德国桑格豪森盆地有20%的库普弗切弗(Kupferschiefer)。岩石学和地球化学分析表明,铜是通过两种不同的过程沉淀的:黄铁矿置换(PR)和热化学硫酸盐还原(TSR)。在本研究中,已对Sangerhausen盆地的剖面中的有机物组成进行了研究,以便估算PR和TSR沉淀的Cu量。通过GC和GC / MS对可溶性有机物进行分析,并通过Rock-Eval热解对干酪根进行分析,结果表明,PR导致铜的沉淀,其富集度低于8%。有机物不参与PR,但在通过硫酸盐还原形成H2S的热化学形成过程中,作为氢供体是必需的。在来自Kupferschiefer底部的样品中,Cu含量为19.88%,有机物中氢的消耗程度使人们可以估计TSR沉淀的Cu量约为12%(占总Cu的60%)。饱和和芳香烃,干酪根和可能的甲烷可作为TSR的氢供体。结果证明页岩成岩过程中硫化铜的逐步沉淀。首先,铜在黄铁矿置换过程中沉淀,当沉积物中沉积的还原S耗尽时,TSR会生成额外的H2S。 (C)2000 Elsevier ScienceLtd。保留所有权利。 [参考:28]

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