| 黔东留茶坡组硅质岩元素地球化学特征与形成环境 |
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| 引用本文： | 杨恩林,陈恨水,陈焕,吴波,陈宇,杨友,罗建均.黔东留茶坡组硅质岩元素地球化学特征与形成环境[J].矿物学报,2011,31(3):406-411. |
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| 作者姓名： | 杨恩林 陈恨水 陈焕 吴波 陈宇 杨友 罗建均 |
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| 作者单位： | 1. 贵州地矿局117地质队,贵州贵阳,550018
2. 贵州地质工程勘查院,贵州贵阳,550008 |
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| 基金项目： | 贵州地矿局“地质科研项目” |
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| 摘 要： | 黔东晚震旦世一早寒武世留茶坡组硅质岩，具有展布广、层位稳、厚度大等特征，并具有热水沉积的岩石学证据。代表性剖面硅质岩主量元素分析结果显示，ｗ（SiO：）为93．41％一96．32％，均值95．23％，表示其为化学成分纯净的硅质岩；TFeO、MnO相对富集，A12O3、TiO2、MgO含量相对较低，与热水沉积物相似，表明具有热水沉积特征；研究区硅质岩的Ba／Sr和U／Th等比值均大于1，以及稀土总量偏低（∑REE为9．22×10^6～24．04X10^6），Ce负异常（0．44～0．76），重稀土富集等特征，表现出热水沉积岩的元素地球化学特征；而其At／（A1＋Fe＋Mn）、K2O／Na20、CaO／（CaO＋Fe）和MgO／A12O3等比值的均值分别为0．46，1．86，0．33和0．19，也暗示出研究区热水沉积硅质岩受到一定程度陆源物质的影响。综合研究表明，典型剖面硅质岩形成于大洋盆地向大陆边缘台地过渡环境。
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| 关 键 词： | 留茶坡组硅质岩 元素地球化学 沉积环境 黔东松桃-岑巩-三都 |
Elemental Geochemistry and Sedimentary Environment of the Liuchapo Siliceous Rocks in Songtao-Cengong-Sandu,Eastern Guizhou Province |
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| YANG En-lin,CHEN Hen-shui,CHEN Huan,WU Bo,CHEN Yu,YANG You,LUO Jian-jun.Elemental Geochemistry and Sedimentary Environment of the Liuchapo Siliceous Rocks in Songtao-Cengong-Sandu,Eastern Guizhou Province[J].Acta Mineralogica Sinica,2011,31(3):406-411. |
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| Authors: | YANG En-lin CHEN Hen-shui CHEN Huan WU Bo CHEN Yu YANG You LUO Jian-jun |
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| Institution: | YANG En-lin1,CHEN Hen-shui1,CHEN Huan1,WU Bo1,CHEN Yu2,YANG You1,LUO Jian-jun1(1.The Geological Team 117,Guizhou Bureau of Geology and Mineral Resources,Guiyang 550018,China,2.Guizhou Prospecting College of Geological Engineering,Guiyang 550008,China) |
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| Abstract: | The Liuchapo siliceous rocks in Songtao-Cengong-Sandu,eastern Guizhou province,stable with high thickness,were widely deposited during the terminal Sinian to early Cambrian,and were proved to be hydrothermal sedimentary with the evidence of petrology.The major elements analysis of the typical profiles showed that the content of SiO2 ranged from 93.41% to 96.32%(mean value being 95.23%),indicating that it was a pure chemical composition of siliceous rocks.The TFeO and MnO contents are relatively high,and the... |
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| Keywords: | siliceous rock Liuchapo formation elemental geochemistry sedimentary environment Songtao-Cengong-Sandu of eastern Guizhou Province |
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