| 陈兴,吴开彬,吴滔,樊洪富,龙建喜,彭成龙,方元,石珉.贵州正安牛都坝地区大竹园组地球化学特征及锂富集机理探讨[J].贵州地质,2025,42(1):17-29 |
| 贵州正安牛都坝地区大竹园组地球化学特征及锂富集机理探讨 |
| Discussion of Geochemical Characteristics and Enrichment Mechanism of Dazhuyuan Formation in Niuduba Area of Zheng’an，Guizhou Province |
| 投稿时间：2024-11-13 |
| DOI： |
| 中文关键词: 大竹园组 锂 氧化环境 古气候 绿泥石 贵州 |
| 英文关键词:Dazhuyuan formation Lithium Paleoclimate Chlorite Guizhou |
| 基金项目:贵州省新一轮找矿突破战略行动项目《贵州1∶5万太白幅(H48E022021)、乐俭幅(H48E022022)、土坪幅(H48E023022)、旺草幅(H48E024022)矿产地质调查》(黔自然资函〔2022〕632 号)、黔地矿科合〔2024〕TD004联合资助 |
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| 中文摘要: |
| 贵州正安牛都坝地区二叠系大竹园组不整合于志留系韩家店组之上，大竹园组中有锂的富集现象。本文通过详细的野外地质调查，对大竹园组开展了主量、微量及稀土元素测试，并结合镜下微观特征及X射线衍射开展研究。结果表明:大竹园组主量元素主要为SiO2、Al2O3、TFe2O3、K2O；其微量元素Li异常富集，Th、U、Nb、Ta、Hf、Zr、Ti相对富集，铝质黏土岩相较于黏土岩更易富集Li、Rb、Ba、K；大竹园组富集轻稀土元素，轻稀土以 La、Ce、Nd 为主，铝质黏土岩相较于黏土岩LREE含量偏低且配分曲线相对平缓，变化范围小，HREE配分曲线位于黏土岩中间。大竹园组沉积环境以开放的氧化环境为主，相对适中的氧化环境更有利于锂富集，CIA值显示较强烈化学作用所代表的炎热潮湿古气候环境有利于锂富集。XRD值显示锂的富集主要与绿泥石相关，其次为伊利石及高岭石，同时铝质黏土岩锂富集可能主要与绿泥石相关，黏土岩中锂富集可能主要与伊利石相关。富锂结构有碎屑状结构，(含)砂质、砂砾质微-泥晶结构。 |
| 英文摘要: |
| The Permian Dazhuyuan Formation in the Niuduba area of Zheng’an，Guizhou is not integrated on the Silurian Hanjiadian Formation，and lithium is enriched in the Dazhuyuan Formation In this paper，through detailed field geological survey，the major，trace and rare earth elements of the Dazhuyuan Formation were tested，and the microscopic characteristics and X-ray diffraction were studied The results show that the major elements of Dazhuyuan Formation are mainly SiO2，Al2O3，TFe2O3 and K2O The trace elements Li are abnormally enriched，Th，U，Nb，Ta，Hf，Zr and Ti are relatively enriched，and Li，Rb，Ba and K are more easily enriched in aluminous clay rocks than in clay rocks Dazhuyuan Formation is rich in light rare earth elements，which are mainly La，Ce and Nd Compared with clay rocks，the LREE content of aluminous clay rocks is low and the partition curve is relatively flat with small variation range The HREE partition curve is located in the middle of the clay rocks The sedimentary environment of Dazhuyuan Formation is dominated by open oxidation environment，and relatively moderate oxidation environment is more conducive to lithium enrichment CIA value shows that hot and humid paleoclimate environment represented by strong chemical interaction is conducive to lithium enrichment XRD results show that the enrichment of lithium is mainly related to chlorite，followed by illite and kaolinite，while the enrichment of lithium in aluminous clay rocks may be mainly related to chlorite，and the enrichment of lithium in clay rocks may be mainly related to illite The Li-rich structure has a clastic structure，(including)sandy and gravel micro-micrite structure |
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