| 新疆巴音沟蛇绿混杂岩带中硅质岩及硅质泥岩的元素地球化学特征及其形成环境 |
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| 引用本文： | 韩文中,欧阳征健,岳艳,柳益群,周鼎武.新疆巴音沟蛇绿混杂岩带中硅质岩及硅质泥岩的元素地球化学特征及其形成环境[J].西北地质,2009,42(2):55-63. |
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| 作者姓名： | 韩文中 欧阳征健 岳艳 柳益群 周鼎武 |
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| 作者单位： | 1. 西北大学地质学系,陕西,西安,710069
2. 山东科技大学地球信息科学与工程学院,山东,青岛,266510 |
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| 基金项目： | 国家重点基础研究发展规划(973计划) |
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| 摘 要： | 巴音沟蛇绿混杂岩带中成薄层状产出的硅质岩、硅质泥岩的Si02：55．37％～91．19％，Al2O3含量较高，变化在3．07～17．66，TiO2=0．12～0．8，Al2O3与TiO2具有较好的正相关关系，表明它们含有较高比例的陆源泥质沉积物质。样品经北美页岩标准化的稀土模式呈现无Ce负异常（Ce／Ce^＊=1．03～1．45）的平坦稀土谱型，球粒陨石标准化稀土模式为轻稀土富集，Eu具明显负异常的右倾谱型。均显示与大陆边缘沉积硅质岩、硅质泥岩相似的稀土配分模式。它们的（La／Ce）N=0．62～0．92，V／Y=0．32～8．87，Th／U=2．99～6．45，表明这些硅质岩、硅质泥岩形成于与陆源物质输入密切相关的大陆边缘环境，综合大地构造背景、蛇绿岩带中超基性、基性岩元素地球化学以及年代学分析认为，蛇绿岩就位于早石炭世晚期，形成在大陆裂谷向大洋裂谷转换并形成小洋盆的环境。
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| 关 键 词： | 硅质岩 硅质泥岩 蛇绿岩混杂岩带 巴音沟 |
Geochemical Characteristics and Sedimentary Environments of Siliceous Rocks and Siliceous Mudstone——Case Study of Bayingou Ophiolitic Mélange in Xianjiang |
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| HAN Wen-zhong,OUYANG Zheng-jian,YUE Yan,LIU Yi-qun,ZHOU Ding-wu.Geochemical Characteristics and Sedimentary Environments of Siliceous Rocks and Siliceous Mudstone——Case Study of Bayingou Ophiolitic Mélange in Xianjiang[J].Northwestern Geology,2009,42(2):55-63. |
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| Authors: | HAN Wen-zhong OUYANG Zheng-jian YUE Yan LIU Yi-qun ZHOU Ding-wu |
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| Institution: | HAN Wen-zhong, OUYANG Zheng-jian, YUE Yan, LIU Yi-qun, ZHOU Ding-wu(1. Department of Geology, Northwest University , Xi＇an 710069, China;2. Geoinformation Science ＆ Engineering College, Shandong University of Scicence and Technology, Qingdao 266510, China) |
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| Abstract: | The flaggy cherts and argillite in the ophiolitic Mélange of Bayingou have a SiO2 content of 55.37%--91.19%, a high Al2O3 content between 3.07%--17.66%, and a TiO2 content of 0. 12%-- 0.8%, having a good positive correlation between Al2O3 and TiO2, suggesting that they have a relatively high percentage of terrigenous muddy sediments. Moreover, they have typical NASC-normalized flat REE patterns without any visible Ce negative anomaly; and the Eu has an obvious right-hand dipping pattern. All these indicate a REE distribution pattern similar to that of deposited cherts and argillite found in continental margins. In addition, they have a Ce/Ce^＊ ratio of 1.03--1.45, a （La/Ce）N of 0. 62--0.92, a V/Y of 032--8.87, and a Th/U of 2.99--6.45, showing that the cherts and argillite are formed in continental margin settings into which the continental material can be easily transported. Therefore, the Bayingou ophiolite was formed in a transitional environment of continental rift to oceanic rift based on our study. |
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| Keywords: | Cherts argillite Ophiolitic Mélange Bayingou |
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