| 新疆三塘湖盆地二叠系湖相白云岩形成机理初探 |
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| 引用本文： | 李红,柳益群,朱玉双.新疆三塘湖盆地二叠系湖相白云岩形成机理初探[J].沉积学报,2007,25(1):75-81. |
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| 作者姓名： | 李红 柳益群 朱玉双 |
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| 作者单位： | 大陆动力学国家重点实验室(西北大学),西安,710069;西北大学地质系,西安,710069;大陆动力学国家重点实验室(西北大学),西安,710069;西北大学地质系,西安,710069;大陆动力学国家重点实验室(西北大学),西安,710069;西北大学地质系,西安,710069 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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吐哈油田资助项目 |
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| 摘 要： | 利用薄片染色、微量元素和稳定同位素测试等方法对三塘湖盆地中二叠统芦草沟组与湖相暗色泥岩共存的白云岩的形成机理进行了探讨。白云岩分为纹层状藻云岩和斑块白云岩两种类型。白云岩的微量元素和同位素特征表明其形成于较高盐度、高Mg/Ca比、强还原的沉积环境。通过对白云岩镁离子来源的分析，认为纹层状藻云岩形成于准同生期，而斑块白云岩则是在埋藏成岩期火山物质淋滤、交代作用下形成的。
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| 关 键 词： | 三塘湖盆地 二叠系 白云岩 白云化模式 |
| 文章编号： | 1000-0550（2007）01-0075-07 |
| 收稿时间： | 2006-02-27 |
| 修稿时间： | 2006-06-15 |
Primary Study on the Origin of Lacutrine Dolostones of Permian,Sangtanghu Basin, Xinjiang |
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| LI Hong,LIU Yi-qun,Zhu Yu-shuang.Primary Study on the Origin of Lacutrine Dolostones of Permian,Sangtanghu Basin, Xinjiang[J].Acta Sedimentologica Sinica,2007,25(1):75-81. |
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| Authors: | LI Hong LIU Yi-qun Zhu Yu-shuang |
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| Institution: | State Key Laboratory of Continental Dynamics(Northwest University), Xi'an 710069 |
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| Abstract: | The origin of dolostones discussed by means of thin sections staining, trace elements analyzing and isotopes testing, which existed together with lucutrine dark mudstone of Lucaogou Formation, middle Permian, Santanghu Basin. The Lucaogou dolostones were composed of lamellar algal dolostone and patchy dolostone. The characteristics of trace elements and stable isotopes indicated that the dolostones formed in the sedimentary environment with higher salinity, higher Ma/Ca ratio and strong reducibility. By analyzing the source of magnesium ion of Lucaogou dolostones, two types of origin were proposed. Lamellar algal dolostone was formed in quasi-contemporaneous phase, and patchy dolostone formed with leaching dolomitization of volcanic material in burial diagenetic phase. |
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| Keywords: | Santanghu Basin Permian lacustrine dolostones dolomitization models |
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