柴达木盆地巴仑马海盐湖黏土沉积矿物学及稀有稀散元素地球化学特征

Sedimentary mineralogy and geochemical characteristics of rare and rare elements in the clay of Salt Lake, Balun Mahai, Qaidam Basin

中文关键词:  黏土矿物  物质组成  相关性  盐湖  锂

英文关键词:Clay minerals  Substance composition  Relevance  Salt Lake  Lithium

中文摘要:

      粘土型锂矿也被称之为沉积型锂矿，是重要的锂矿类型之一，它以结构锂或吸附锂的赋矿形式赋存于蒙皂石族矿物、伊利石等黏土矿物的层间或晶格中。近年，笔者团队在柴达木西北部的巴伦马海成盐盆地以粘土层为研究对象，对黏土样品进行了化学全分析、X射线衍射分析、主微量元素含量分析、扫描电镜测试，探讨了粘土层内黏土矿物的物质组成及元素地球化学特征。结果表明，研究区粘土层内的黏土矿物主要由伊利石、绿泥石、伊蒙混层、高岭石等组成。元素地球化学分析显示，锂应该主要赋存于伊利石、绿泥石、伊蒙混层等黏土矿物中，与Si、Al、K、Mg等元素具有较强的正相关性；B的赋存与绿泥石密切相关，与Mg、Fe元素具有较好的正相关性；此外，Rb、Cs与Li在地质过程中具有相似的地球化学行为。

英文摘要:

      Clay-type Lithium ore, also known as sedimentary Lithium ore, is one of the important Lithium ore types. It is endowed with structural Lithium or adsorbed Lithium in the interlayer or lattice of Clay minerals such as monazite group minerals and illite. In recent years, the author"s team has studied the clay layers in the Barunmahay salt-forming basin in northwestern Qaidam. Chemical total analysis, X-ray diffraction analysis, main trace element content analysis, and scanning electron microscope test were performed on clay samples. The Substance composition and elemental geochemical characteristics of Clay minerals within the clay layer were investigated. The results showed that the Clay minerals within the clay layer in the study area mainly consisted of illite, chlorite, imonite mixed layer, kaolinite and so on. The elemental geochemical analysis shows that Lithium is mainly found in the Clay minerals such as illite, chlorite and imonite. In addition, Rb, Cs and Li have similar geochemical behaviors in geological processes.