黔北牛都坝地区下二叠统大竹园组中锂矿化体地质地球化学特征  

Geological and geochemical characteristics of lithium mineralization body in Lower Permian Dazhuyuan Formation at Niuduba area of North Guizhou

作　　者：杨仕江 罗伟 庞鸿 苟建彬 石杰 梁潇 YANG Shijiang;LUO Wei;PANG Hong;GOU Jianbin;SHI Jie;LIANG Xiao(The 3rd General Team of Guizhou Nonferrous Metals and Nuclear Industry Geological Survey Bureau,Zunyi 563000,Guizhou,China;College of Engineering and Technology,Zunyi Normal University,Zunyi 563006,Guizhou,China)

机构地区：[1]贵州省有色金属和核工业地质勘查局三总队,贵州遵义563000 [2]遵义师范学院工学院,贵州遵义563006

出　　处：《矿产与地质》2025年第1期11-17,共7页Mineral Resources and Geology

基　　金：贵州省基础研究(自然科学)项目黔北地区中二叠世铝土矿(岩)中锂超常富集机理研究(编号:黔科合基础-ZK[2021]一般204);贵州省自然资源厅新一轮战略找矿项目(黔自然函﹝2023﹞119号);遵义市科技计划项目(遵市科合HZ字[2024]144号)共同资助。

摘　　要：贵州北部务川—正安—道真地区下二叠统大竹园组中除蕴藏有巨量的铝土矿资源外,尚赋存有大量的锂矿资源,近年来,在其南部的牛都坝向斜内勘查发现了锂矿化体(以Li_(2)O≥0.2%圈矿)。本文报道了牛都坝地区各类岩(矿)石锂含量特征及新发现锂矿化体的地质地球化学特征,并为该地区进一步找寻锂矿资源提出指导建议。大竹园组铝土岩中Li_(2)O含量为0.127%~0.754%(平均0.404%),铝质黏土岩中Li_(2)O含量为0.0066%~1.215%(平均0.169%),黏土岩中Li_(2)O含量为0.0012%~0.167%(平均0.019%)。梁山组碳质泥岩Li_(2)O含量为0.0059%~0.0198%(平均0.0103%)。韩家店组泥岩Li_(2)O含量为0.0134%~0.0275%(平均0.0173%)。锂矿化体呈层状、似层状产于牛都坝向斜两翼大竹园组中上部,走向长约6 km,倾向上最大延伸约800 m,厚0.74~3.66 m(平均1.71 m)。锂矿石类型有铝质黏土岩型和铝土岩型,具粒屑结构、泥晶结构,致密状、块状构造。Li_(2)O与Al_(2)O_(3)、A/S呈中等正相关关系,与SiO_(2)、TFe_(2)O_(3)呈弱的负相关关系,表明Al_(2)O_(3)含量的适当增加(<50%),SiO_(2)、TFe_(2)O_(3)含量的降低,有利于锂的富集。务川—正安—道真地区大竹园组中铝土矿品质较低或成矿地质条件较差的地段,是找寻锂矿的有利地段。In addition to abundant bauxite resources,Lower Permian Dazhuyuan Formation in the Wuchuan-Zheng'an-Daozhen area of North Guizhou also contains a large amount of lithium mineral resources.In recent years,lithium mineralization bodies(circled at Li2O≥0.2%)have been discovered in the Niuduba syncline in its south part.This paper reports the lithium content in various types of rocks(ores)and the geological and geochemical characteristics of the newly discovered lithium mineralization body in the Niuduba area.It is further proposed for the future lithium prospecting direction in the area.Within the Dazhuyuan Formation,Li_(2)O content ranges from 0.1273%to 0.754%(average 0.4043%)in bauxite stone,0.0066%to 1.2152%(average 0.1697%)in aluminous claystones,and 0.0012%to 0.1678%(average 0.019%)in claystones.Carbonaceous mudstone from the Liangshan Formation shows Li_(2)O content is 0.0059%to 0.0198%(average 0.0103%),and mudstone from the Hanjiadian Formation ranges from 0.0134%to 0.0275%(average 0.0173%).The lithium mineralization body is layered and located in the middle and upper part of the Dazhuyuan Formation on both flanks of the Niuduba syncline,with a striking length of about 6 km,and a maximum extension of about 800 m on the dipping direction,with a thickness of 0.74~3.66 m(average 1.71 m).Lithium ore types include aluminum clay rock type and bauxite rock type,with granular structure,mud crystal structure,dense and blocky structure.Li_(2)O shows a moderate positive correlation with Al_(2)O_(3)and A/S,and a weak negative correlation with SiO_(2)and TFe_(2)O_(3),indicating that an appropriate increase in Al_(2)O_(3)content(<50%)and a decrease in SiO_(2)and TFe_(2)O_(3)content are beneficial for lithium enrichment.The section of the Dazhuyuan Formation in the Wuchuan-Zheng'an-Daozhen area where the quality of bauxite is low or the geological condition for bauxite mineralization is poor is a favorable location to explore for the lithium deposit.

关 键 词：锂矿化体 铝土岩 大竹园组 地质特征 地球化学特征 贵州北部 

分 类 号：P618.71[天文地球—矿床学]