黔北务—正—道铝土矿床不活动元素地球化学与质量平衡计算
Immobile Elements Geochemistry and Mass Balance Calculate of Bauxite in Wuchuan-Zheng'an-Daozhen Area,Northern Guizhou Province,China
查看参考文献20篇
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文摘
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贵州务川—正安—道真(务—正—道)铝土矿属于古风化壳沉积型铝土矿床,是黔中—渝南铝土矿成矿带的重要组成部分。铝土矿产于中下志留系韩家店组(S1-2hj)泥页岩或上石炭统黄龙组(C2h)灰岩的侵蚀面上,含矿层位为中二叠统梁山组(P2l)。根据元素地球化学特征及相关分析表明,Ti、Zr、Nb、Cr、Th、Ga、Hf、Ta及V在铝土矿矿化过程中均为不活动元素。特别是Ti在铝土矿矿化过程中性质最稳定,故可对其用于质量平衡的计算。铝土矿化过程中一些元素的质量变化可以通过不活动元素在铝土矿(岩)和中下志留系韩家店组 (S1-2hj)泥页岩中的含量变化来估算。计算结果显示,大多数活动元素从铝土矿体系中移走,部分Si、Mg、K、Fe以及少量的弱活动性Al向下渗透,并沉淀为伊利石(绢云母、绿泥石)、赤铁矿和石英或非晶体硅。通过系统研究和质量平衡计算,可初步确定S1-2hj泥页岩为务—正—道铝土矿主要的成矿原岩。 |
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其他语种文摘
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Bauxite deposits located in the Wuchuan-Zheng'an-Daozhen,northern Guizhou province,are important bauxite resources of bauxite belt of central Guizhou and south Chongqing belongs to paleo-weathering crust sedimentary deposits.Bauxites occur in argillite and shale of lower-middle Silurian Hanjiadian group(S1-2 hj),or onthe limestone erosion surface of Upper Carboniferous Huanglong Formation(C2h).Ore controlling strata are middle Permian Liangshan Formation(P2l).Geochemistry of immobile elements and correlation coefficients show that Al, Ti,Zr,Nb,Cr,Ga,Hf,Ta,Th and V were immobile during the bauxutization process.Furthermore,Ti was proved to be the most immobile element during the bauxitization process and was used for mass change calculations. Mass changes were calculated by using the concentration ratio of immobile elements for the different bauxite rocks and the argillite and shale of lower-middle Silurian Hanjiadian Formation(S1-2hj).Mass changes suggest obviously removal of mobile elements from the system.Considerable Si,Mg,K,Fe and minor Al seeped downward and were precipitated as illite(sericite,chlorite),hematite and quartz or amorphous silica.Through systematic study and the mass balance calculation,we can conclude that the main source of the bauxite deposits in the Wuchuan-Zheng'an-Daozhen areas was the underlying argillite and shale of lower-middle Silurian Hanjiadian formation(S1-2 hj). |
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来源
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矿物学报
,2011,31(3):397-405 【核心库】
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关键词
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不活动元素地球化学
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质量平衡
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务—正—道铝土矿
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地址
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1.
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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贵州省有色金属和核工业地质勘查局, 贵州, 贵阳, 550005
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贵州省有色金属和核工业地质勘察局七总队, 贵州, 贵阳, 561000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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中国科学院知识创新工程重要方向项目
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中国科学院贵阳地球化学研究所矿床地球化学中国科学院重点实验室基金
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文献收藏号
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CSCD:4327425
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