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黔西北峨眉山玄武岩风化壳三稀矿产资源富集成矿规律
- 作者：
- 郑禄林|魏怀瑞|高军波|陈军|曹胜桃
- 作者单位：
- 贵州大学矿业学院|贵州大学资源与环境工程学院|贵州大学资源与环境工程学院|贵州大学资源与环境工程学院|贵州大学资源与环境工程学院
基金项目：
- 国家自然科学基金项目（41962008）
详细信息：
- 作者简介：
- 郑禄林（1983—），男，贵州大方人，副教授，博士，从事基础地质、安全工程教学及科研工作；贵阳市花溪区贵州大学西校区，贵州大学矿业学院，550025；E-mail:zhenglulin1983@126.com
- 通讯作者：
- isnull
- PDF下载
Accumulation and mineralization regularity of three rare mineral resources in weathering crust of basalt in northwestern Guizhou
- English Author：
- College of Mining,Guizhou University|College of Resources and Environmental Engineering,Guizhou University|College of Resources and Environmental Engineering,Guizhou University|College of Resources and Environmental Engineering,Guizhou University|College of Resources and Environmental Engineering,Guizhou University
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
黔西北上二叠统峨眉山玄武岩顶部与宣威组底部之间发育一套厚度较为稳定的风化壳，其富集三稀元素。为了揭示三稀元素富集规律，选择威宁县石门坎的毛家坪剖面开展元素地球化学研究。结果表明:三稀元素主要富集于风化壳黏土岩中，且表现为上部三稀元素含量高，下部三稀元素含量低，铝土质黏土岩明显比玄武岩富集铌和稀土元素，尤其是高岭石细脉中异常富集铌（w（Nb2O5）=0.059 %）和钇（w（Y）=512.0×10-6），风化壳黏土岩的化学蚀变指数（CIA）多数高达95～100，反映岩石遭受了强烈的化学风化作用。稀土元素球粒陨石标准化配分模式图和微量元素原始地幔标准化蛛网图显示，富铌和稀土元素的风化壳黏土岩物质来源为峨眉山玄武岩。地球元素特征指示成矿环境主要为还原—氧化过渡环境，峨眉山玄武岩遭受长期风化、淋漓作用是形成富稀土元素、铌铝土质黏土岩的关键。
关键词:
铌；风化壳；铝土质黏土岩；富集规律；黔西北
Abstract:
A set of weathering crusts with relatively stable regional thickness developed between the top of the Upper Permian Basalt and the bottom of the Xuanwei Formation in northwestern Guizhou,which is enriched with three rare elements.To reveal the enrichment rules of three rare elements,the Maojiaping section in Shimenkan,Weining County was selected to carry out elemental geochemistry research.The results show that the three rare elements are mainly concentrated in the clay rock of weathering crust,and the content of the three rare elements is high in the upper part and low in the lower part.The aluminite clays are obviously richer in niobium and rare earth elements than basalt,especially in kaolinite veins where niobium (w(Nb2O5)=0.059 %) and yttrium (w(Y)=512.0×10-6) are abnormally enriched.The chemical alteration index (CIA) of weathering crust clays is mostly as high as 95-100,reflecting that the rocks have suffered strong chemical weathering.According to the chondrite normalized partitioning model and the primitive mantle normalized cobweb diagram of trace elements,the weathering crust clays rich in niobium and rare earth elements are derived from the Emeishan basalt.The characteristics of the earth elements indicate that the metallogenic environment is mainly a reduction-oxidation transition environment,and the long-term weathering and leach-ing of basalt is the key to the formation of rich in rare earth elements and niobium aluminum clay rocks.
Keywords:
niobium;weathering crust;aluminous clay rock;regularity of enrichment;northwestern Guizhou
