| 山西平朔矿区上石炭统太原组11号煤层沉积地球化学特征及其成煤微环境? |
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| 引用本文： | 秦勇,王文峰,宋党育,张晓东.山西平朔矿区上石炭统太原组11号煤层沉积地球化学特征及其成煤微环境?[J].古地理学报,2005,7(2):249-260. |
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| 作者姓名： | 秦勇 王文峰 宋党育 张晓东 |
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| 作者单位： | 中国矿业大学资源与地球科学学院 江苏徐州 221008 |
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| 基金项目： | 江苏省新世纪学科带头人培养基金;研究生创新项目 |
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| 摘 要： | 山西平朔矿区上石炭统太原组11号煤层具有中硫、高灰、较高有机硫的特征，但其中各煤分层的基本性质差异较大，指示其成煤微环境显著变化。地球化学研究表明，Ca/（Ca＋Fe）、Th/U、Al/Ti、V/Zn、δEu、δCe可作为指示11号煤层沉积水介质盐度的标志，St,d、So,d/Sp,d可分别作为指示水介质氧化还原程度和酸碱度的标志，Ad、V/I、ΣREE可作为指示水介质动力条件的标志。在此基础上，分析了该煤层成煤微环境特征及其演化历程，认为11号煤层形成于波动式海进的半咸水-咸水沉积环境。在此过程中，海水对泥炭沼泽的影响经历了3个发展阶段：第1阶段，泥炭形成于微咸-半咸水条件，水动力条件逐渐增强；第2阶段，泥炭形成于半咸水-咸水条件，水动力条件总体上相对较强，沼泽水体从逐渐加深演化为显著变浅；第3阶段，泥炭形成于半咸水环境，海水影响再次逐渐增强，在泥炭沼泽演化末期水体显著变深，动力条件明显减弱，还原性显著增强。
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| 关 键 词： | 山西 平朔 上石炭统 煤层 地球化学 成煤微环境 半咸水至咸水 |
| 文章编号： | 1671-1505(2005)02-0249-12 |
| 修稿时间： | 2004年8月24日 |
Geochemistry characteristics and sedimentary micro-environments of No.11 coal seam of the Taiyuan Formation of Upper Carboniferous in Pingshuo Mining District,Shanxi Province |
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| Qin Yong,Wang Wenfeng,Song Dangyu,Zhang Xiaodong.Geochemistry characteristics and sedimentary micro-environments of No.11 coal seam of the Taiyuan Formation of Upper Carboniferous in Pingshuo Mining District,Shanxi Province[J].Journal of Palaeogeography,2005,7(2):249-260. |
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| Authors: | Qin Yong Wang Wenfeng Song Dangyu Zhang Xiaodong |
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| Institution: | Institute of Mineral Resources and Geoscience, China University of Mining and Technology, Xuzhou 221008, Jiangsu |
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| Abstract: | The No.11 coal seam of the Taiyuan Formation of Upper Carboniferous in the Pingshuo Mining District is generally characteristic of the middle-sulfur, high-ash and higher-organic sulfur, but there are great differences of the essential identifications among the coal layers, which might imply the remarkable diversification of the coal-forming micro-environments. The results show that the Ca/(Ca＋Fe), Th/U, Al/Ti, V/Zn, δEu andδCe could be used as the salinity indicators, the St,d and So,d/Sp,d respectively as the Eh and pH indicators, and the Ad, V/I and ΣREE as the water-dynamic indicators. Based on the indicators, the coal-forming micro-environments and the evolution of the seam were analyzed. It was considered that the seam was formed under the brackish to salt water micro-environments with the fluctuant transgression and the effect of the paleo-seawater on the peat swamp experienced three stages. The peat was formed in the slightly brackish to brackish micro-environment with the gradually reinforced water-dynamic condition during the first stage, in the brackish to salt water micro-environment with the rather strong water-dynamic condition during the second stage, and in the brackish micro-environment with the distinctly weakened water-dynamic condition during the third stage. |
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| Keywords: | Shanxi Province Pingshuo Upper Carboniferous coal seam geochemistry coal-forming micro-environment brackish water to salt water |
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