Primary Study on the Origin of Lacutrine Dolostones of Permian, Sangtanghu Basin, Xinjiang
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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。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 quasicontemporaneous phase, and patchy dolostone formed with leaching dolomitization of volcanic material in burial diagenetic phase.
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Key words:
- Santanghu Basin /
- Permian /
- lacustrine dolostones /
- dolomitization models
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