黔中石炭系九架炉组含铝岩系中锂分布规律  

Distribution pattern of lithium in aluminum-bearing rock series of the Carboniferous Jiujialu Formation in central Guizhou Province,China

作　　者：蔡路 陈华 杨瑞东[1] 董艳杰 梁鹏 周东东 高爽 杨明坤 CAI Lu;CHEN Hua;YANG Ruidong;DONG Yanjie;LIANG Peng;ZHOU Dongdong;GAO Shuang;YANG Mingkun(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;115th Geological Brigade,Bureau of Geology and Mineral Exploration and Development,Guizhou Province Guiyang 551400,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]贵州省地质矿产勘查开发局一一五地质大队,贵州贵阳551400

出　　处：《古地理学报》2025年第2期383-394,共12页Journal of Palaeogeography:Chinese Edition

基　　金：贵州省找矿突破战略行动重大协同创新项目(黔科合战略找矿[2022] ZD002、[2022] ZD003);贵州省战略性关键金属超常富集成矿动力学重大研究计划(地勘2024-2);国家自然科学基金(编号:U23A2027)联合资助。

摘　　要：黔中清镇—修文地区铝土矿资源丰富,累计查明铝土矿资源量4.28×10^(8) t,初步估算石炭系九架炉组(C_(1)jj)含矿岩系中Li_(2)O的远景资源量16.84×10^(4) t,具有潜在综合利用前景。利用黔中地区130条含铝岩系岩石地球化学剖面数据,研究九架炉组中锂的分布规律。结果显示,随着九架炉组寒武系基底地层由老变新,Li_(2)O含量逐渐增大,基底为高台—石冷水组时,九架炉组中Li_(2)O含量相对较高,且分布连续稳定。Li_(2)O含量按岩性:铝质黏土岩>铝土岩>黏土岩>铝土矿>铁质黏土岩、赤铁矿,按矿石自然类型:致密状铝土矿>碎屑状铝土矿>>土状—半土状铝土矿。在铝土矿顶底处,由致密状铝土矿向铝质黏土岩、铝土岩转变的岩性过渡带中,Li_(2)O易富集(≥2000μg/g),形成“Li_(2)O异常富集层(铝质黏土岩、铝土岩)—铝土矿—Li_(2)O异常富集层(铝质黏土岩、铝土岩)—铝土矿”的垂向分布特征。九架炉组中Li_(2)O含量受基底地层Li_(2)O背景值、母岩的风化程度、岩性和矿石类型等因素控制。基底Li_(2)O背景值越高,含铝岩系中Li_(2)O的含量相对越高。随着母岩风化程度的加深,Li_(2)O经历先增加后减少的过程,在30%≤Al_(2)O_(3)≤55%、25%≤SiO_(2)≤45%、0.75≤Al/Si≤2.2的区间,Li_(2)O值明显富集。同时,优选出长冲河矿区、坛罐窑矿区2个矿区,Li_(2)O含量较高(≥2000μg/g),且横向分布相对连续稳定,有较好的综合利用前景。The Qingzhen-Xiuwen area in central Guizhou Province is rich in bauxite resources,with a total iden tified bauxite resource of 4.28×10^(8) t.The preliminary estimate is that the prospective resource of Li_(2)O in the ore-bearing rock series of the Carboniferous Jiujialu Formation(C_1jj)is 16.84×10^(4) t,which has potential for comprehensive utilization.This study utilized geochemical profile data from 130 aluminum-bearing rock formations in the Guiyang area to investigate the distribution pattern of lithium in the Jiujialu Formation.The results showed that as the Cambrian basement strata of the Jiujialu Formation changed from old to new,the Li_(2)O content gradually increased.When the basement was the Gaotai Shilengshui Formation,the Li_(2)O value in the Jiujialu Formation was relatively high and the distribution was continuous and stable.Li_(2)O content is determined by lithology:aluminum clay rock>bauxite rock>clay rock>bauxite>iron clay rock,hematite.According to the natural type of ore:dense bauxite>detrital bauxite>>soil semi soil bauxite.At the top and bottom of bauxite,in the lithological transition zone from dense bauxite to aluminum clay rock and bauxite rock,Li_(2)O is easily enriched(≥ 2000 μg/g),forming a vertical distribution characteristic of “Li_(2)O abnormal enrichment layer(aluminum clay rock,bauxite rock)-bauxite-Li_(2)O abnormal enrichment layer(aluminum clay rock,bauxite rock)-bauxite”.The Li_(2)O content in the Jiujialu Formation is controlled by factors such as the Li_(2)O background value of the basement strata,the degree of weathering of the parent rock,lithology,and ore type.The higher the background value of Li_(2)O in the base,the relatively higher the content of Li_(2)O in the bauxite series.As the weathering degree of the parent rock deepens,Li_(2)O undergoes a process of first increasing and then decreasing.In the range of 30%≤Al_2O_3≤ 55%,25%≤SiO_(2)≤ 45%,and 0.75≤Al/Si≤ 2.2,Li_(2)O values are signifi cantly enriched.At the same time,two mining areas,Changchongh

关 键 词：黔中 寒武系 九架炉组 含铝岩系 锂 地球化学 分布规律 

分 类 号：P632.2[天文地球—地质矿产勘探]