Pyrite Formation in Organic-rich Clay, Calcitic and Coal-Forming Environments |
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作者姓名: | Gordana DEVIC Petar PFENDT Branimir JOVANCICEVIC Zoran POPOVIC |
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作者单位: | [1]Center of Chemistry, IChTM, Njegogeva 12, 11000 Belgrade, Serbia [2]Faculty of Chemistry, University of Belgrade, POB 158, 11001 Belgrade, Serbia [3]Ministry of Science and Environmental Protection, Department of Geology, Belgrade, Serbia |
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基金项目: | We thank Prof. Stevan Duric (Faculty of Mining and Geology, University of Belgrade) for the X-ray analysis of samples and helpful disscussion of the results. We specially thank Dr. Hermann Wehner (Federal Institute of Geosciences and Natural Resources, Hannover, Germany) for the opportunity to use the GC-MS apparatues. This work was supported in part by the Research Fund of the Republic of Serbia. |
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摘 要: | The early diagenetic characteristics of pyrite formation processes in a Miocene freshwater sequence of mixed sediments (coal fragments in clays, sandstones or shales) alternating with continuous brown coal layers was investigated. Based on abundant minerals, the following main sedimentary environments were distinguished: the illite-montmorillonitic (I-M), calcitic (Ct) and coal-forming environment (CL). For these hydrogeochemically differing environments the effects of limiting factors on the pyrite formation process (availability of sulphate and Fe, amount of organic matter and participation of organic sulphur) were assessed by correlation analysis. Significant differences in the effects of these limiting factors in the particular environments were observed. These differences were explained taking in account the different oxidative activity, Fe-complex and surface complex forming properties of humic substances in dependence of pH of environment and the abundance of sorptionally active clay minerals. In environments having a relatively low pH and containing clay minerals (I-M- and CL-environments) the oxidative activity of humic substances (Hs) on pyrite precursors was greatly prevented however pyrite formation depended on reactive Fe availability as the consequence of complex formation. On the contrary, in environments with a relatively high pH, as it was the calcitic, the oxidative activity of Hs was greatly enhanced, thus oxidizing the sulfur precursors of pyrite. The oxidation degree of organic matter was probably also a consequence of the differing activity of the humic electron-acceptors.
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关 键 词: | 成岩作用 岩石 黄铁矿 煤矿 有机物质 |
收稿时间: | 2005-08-12 |
修稿时间: | 2005-12-11 |
Pyrite Formation in Organic-rich Clay, Calcitic and Coal-Forming Environments |
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Authors: | Gordana;DEVIC;Petar;PFENDT;Branimir;JOVANCICEVIC;Zoran;POPOVIC |
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Institution: | Gordana DEVI(C),Petar PFENDT,Branimir JOVAN(C)I(C)EVI(C),Zoran POPOVIC |
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Abstract: | The early diagenetic characteristics of pyrite formation processes in a Miocene freshwater sequence of mixed sediments (coal fragments in clays, sandstones or shales) alternating with continuous brown coal layers was investigated. Based on abundant minerals, the following main sedimentary environments were distinguished: the illite-montmorillonitic (I-M), calcitic (Ct) and coal-forming environment (CL). For these hydrogeochemically differing environments the effects of limiting factors on the pyrite formation process (availability of sulphate and Fe, amount of organic matter and participation of organic sulphur) were assessed by correlation analysis. Significant differences in the effects of these limiting factors in the particular environments were observed. These differences were explained taking in account the different oxidative activity, Fe-complex and surface complex forming properties of humic substances in dependence of pH of environment and the abundance of sorptionally active clay minerals. In environments having a relatively low pH and containing clay minerals (I-M-and CL-environments) the oxidative activity of humic substances (Hs) on pyrite precursors was greatly prevented however pyrite formation depended on reactive Fe availability as the consequence of complex formation. On the contrary, in environments with a relatively high pH, as it was the calcitic, the oxidative activity of Hs was greatly enhanced, thus oxidizing the sulfur precursors of pyrite. The oxidation degree of organic matter was probably also a consequence of the differing activity of the humic electron-acceptors. |
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Keywords: | early diagenesis pyrite formation humic electron-acceptors calcitic environment illitemontmorillonitic environment coal mixed sediments |
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