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| 微量元素分析在判别沉积介质环境中的应用——以鄂尔多斯盆地西部中区晚三叠世为例 | |
| 引用本文： | 范玉海,屈红军 王 辉,杨县超 冯杨伟.微量元素分析在判别沉积介质环境中的应用——以鄂尔多斯盆地西部中区晚三叠世为例[J].中国地质,2012,39(2):382-389. |
| 作者姓名： | 范玉海 屈红军 王 辉 杨县超 冯杨伟 |
| 作者单位： | 1. 中煤航测遥感局遥感应用研究院,陕西西安710054;西北大学大陆动力学国家重点实验室,陕西西安710069 2. 西北大学大陆动力学国家重点实验室,陕西西安,710069 3. 延长油田股份有限公司,陕西延安,716000 |
| 基金项目： | 国家科技重大专项(2008ZX05025-006);国家重点基础研究发展规划“973”项目(2009CB219400)联合资助 |
| 摘 要： | 以鄂尔多斯盆地西部中区晚三叠世样品中微量元素测试结果为基础,选用对沉积介质环境反映比较敏感的锶(Sr)、铜(Cu)、钡(Ba)、铀(U)、钛(Ti)、钒(V)、镍(Ni)等微量元素指标,分析研究区地层中微量元素含量及其比值与沉积介质环境之间的对应关系,进而探讨鄂尔多斯盆地西部中区晚三叠世的沉积介质环境。结果表明,鄂尔多斯盆地西部中区晚三叠世延长组长9-长7期基本为温湿气候且变得越来越温暖潮湿;长9-长7期为微咸水相的淡水环境,长7期盐度含量略有增加;长9、长8期水体的氧化还原条件比较正常,长7期变为厌氧环境;长9-长7期垂向上水体分层不强。 |
| 关 键 词： | 微量元素 沉积介质环境 晚三叠世 延长组 鄂尔多斯盆地西部中区 |
The application of trace elements analysis to identifying sedimentary media environment: a case study of Late Triassic strata in the middle part of western Ordos Basin |
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| FAN Yu-hai,QU Hong-jun,WANG Hui,YANG Xian-chao,FENG Yang-wei.The application of trace elements analysis to identifying sedimentary media environment: a case study of Late Triassic strata in the middle part of western Ordos Basin[J].Chinese Geology,2012,39(2):382-389. | |
| Authors: | FAN Yu-hai QU Hong-jun WANG Hui YANG Xian-chao FENG Yang-wei |
| Institution: | 1.Remote Sensing Application Institute of ARSC,Xi’an 710054,Shaanxi,China;2.State Key Laboratory of Continental Dynamics,Northwest University,Xi’an 710069,Shaanxi,China;3.Yanchang oilfield Corporation,Yan’an 716000,Shaanxi,China) |
| Abstract: | This paper deals mainly with sedimentary media environment of Late Triassic epoch in the middle part of western Ordos Basin through identifying the corresponding relationships between trace element compositions and sedimentary media environment on the basis of analytical results of some special trace elements such as Sr,Cu,Ba,U,Ti,V and Ni which are sensitive to sedimentary media environment.The results of the study show that the sedimentary media environment of Late Triassic epoch from Chang-9 to Chang-7 was warm humid climate in general and tended to become increasingly warm and humid in upward direction,indicating the brackish water phase of the freshwater environment with a slight increase in salinity of Chang-7.The redox condition from Chang-9 to Chang-8 was normal,while that of Chang-7 became anoxic.The vertical variation of water column stratification is not obvious from Chang-9 to Chang-7. |
| Keywords: | trace element sedimentary media environment Late Triassic Yanchang Formation middle part of western Ordos Basin |
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