| 甘肃北山红山铁矿区硅质岩地球化学特征及其成因意义 |
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| 引用本文： | 王磊,杨建国,王小红,谢燮.甘肃北山红山铁矿区硅质岩地球化学特征及其成因意义[J].西北地质,2012(3):32-40. |
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| 作者姓名： | 王磊 杨建国 王小红 谢燮 |
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| 作者单位： | 西安地质矿产研究所,陕西西安710054 |
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| 基金项目： | 中国地质调查局地质专项“甘肃北山营毛沱-玉石山铁铜多金属矿产调查”（1212011085090） |
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| 摘 要： | 甘肃北山地区红山铁矿区硅质岩与铁矿体紧密伴生,且有些硅质岩本身就是铁矿石。常量元素分析表明:硅质岩普遍具有高Si、高Fe、低Al特征,K2O含量普遍高于Na2O,且Fe/Ti值为57.14～218.74,(Fe+Mn)/Ti值为57.54～224.16,Al/(Al+Fe+Mn)值为0.05～0.14,均符合热水沉积硅质岩的特征,但存在少量陆源物质介入。稀土微量元素分析表明:硅质岩大部分微量元素相对于克拉克值亏损,稀土元素总量低,经北美页岩标准化后,Ce异常明显或微明显,Eu呈现明显的正异常,重稀土相对轻稀土富集;δCe值为0.93～1.05,平均为0.99;La/Ce值为0.43～0.49,平均为0.44,更接近于大陆边缘硅质岩的特征。综合以上地球化学特征,硅质岩具有明显的热水沉积成因属性,同时有陆源组分的加入,进而得出红山铁矿为与热水沉积成因有关的铁矿床,当时形成环境为大陆边缘环境。
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| 关 键 词： | 硅质岩 地球化学 热水成因 甘肃北山 |
Geochemical Characteristics of Chert of Hongshan Iron Deposit in Gansu Province and Its Petrogenic Significance |
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| WANG Lei,YANG Jian-guo,WANG Xiao-hong,XIE Xie.Geochemical Characteristics of Chert of Hongshan Iron Deposit in Gansu Province and Its Petrogenic Significance[J].Northwestern Geology,2012(3):32-40. |
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| Authors: | WANG Lei YANG Jian-guo WANG Xiao-hong XIE Xie |
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| Institution: | (XiPan Institute of Geology and Mineral Resources, XiPan 710054, China) |
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| Abstract: | The chert from Hongshan iron deposit is closely associated with the iron ore body, and some cherts are iron ores themself. Chemical analysis of the chert shows that it generally has the features of high content of Si and Fe, low content of AI, and higher content of KzO than NazO, and the ratio of Fe/Ti is between 57. 14-218.74, （Fe＋Mn） /Ti is between 57.54-224. 16, A1/ （Al＋Fe＋Mn） is between 0. 05- 0. 14, which are all according with the features of hydrothermal sedimentary chert, but with little terrigenous materials. Trace element analysis of the chert shows that most of the trace elements are lower than the Clarke value and the total REE is lower. Normalized by the North American shale, HREE is richer than LREE, and the geochemical characteristics of the chert indicate that they are hydrothermally sedimentary origin, but with existence of certain continental sources. So it can he concluded that the Hongshan iron deposit is associated with hydrothermal depesite with terrigenous materials and it was formed in the environment of continental margin. |
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| Keywords: | chert geochemical characteristics hydrothermal origin Beishan |
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