贵州金沙煤矿东部晚二叠世龙潭组底部铝土质泥岩中镓富集规律及找矿前景  

Gallium Enrichment Rules and Prospecting Prospect in the Bottom Aluminaceous Mudstone of Late Permian Longtan Formation,East Jinsha Coal Mine,Guizhou Province

作　　者：徐建[1] 龙宇 明方平 方生红 XU Jian;LONG Yu;MING Fang-Ping;FANG Sheng-hong(Guizhou Coal Mine Geological Engineering Consulting and Geological Environment Monitoring Center,Guiyang 550006,Guizhou,China)

机构地区：[1]贵州煤矿地质工程咨询与地质环境监测中心,贵州贵阳550006

出　　处：《贵州地质》2024年第2期123-129,共7页Guizhou Geology

摘　　要：研究区位于金沙县东部,龙潭组底部铝土质泥岩中镓含量为24.7269.38 ug/g,平均43.87 ug/g。通过相关关系法,分析了Ga与SiO_(2)、Al_(2)O_(3)、Fe_(2)O_(3)、TiO_(2)的相关关系,其中Ga与SiO_(2)呈中负相关,与Al_(2)O_(3)+Fe_(2)O_(3)+TiO_(2)呈强正相关,表明镓在风化、搬运和沉积过程中更容易追随Al与Ti,主要以离子吸附态或以氢氧化物胶体方式赋存。根据含镓岩系岩性、沉积构造及化石特征,富铝粘土岩系沉积时期由下至上古水深为深-浅-深,氧化还原环境为还原-弱氧化-还原环境,风化作用相对弱-强-相对弱的变化规律。结合大地构造背景,镓的富集有利区为滨海平原及低洼地带,主要经历源岩风化-搬运-再风化淋滤过程。研究区北东部田湾煤矿-沙土-中心一带含矿品位高,为找矿前景区。The study area is located in the east of Jinsha county.The content of gallium in the aluminous mudstone at the bottom of Longtan formation ranges from 24.72 to 69.38 ug/g,with an average of 43.87 ug/g.The correlation between Ga and SiO_(2),Al_(2)O_(3),Fe_(2)O_(3) and TiO_(2) was analyzed by correlation method,in which Ga was moderately negative correlated with SiO_(2) and strongly positive correlated with Al_(2)O_(3)+Fe_(2)O_(3)+TiO_(2),indicating that gallium was more likely to follow Al and Ti in the process of weathering,transport and deposition.It occurs mainly in the ionic adsorbed state or in the form of hydroxide colloid.According to lithology,sedimentary structure and fossil characteristics of gallium-bearing rock series,the water depth of aluminum-rich clay rock series is deep-shallow-deep,the REDOX environment is reduction-weak oxidation-reduction environment,and the weathering is relatively weak,strong and weak.Combined with the tectonic background,the favorable areas for gallium enrichment are coastal plain and low-lying areas,which mainly undergo the process of source rock weathering,transport and reweathering leaching.The Tianwan coal mine-sandy soil-central area in the north east of the study area has high ore grade and is a prospecting prospect area.

关 键 词：金沙县东部矿区 龙潭组 铝土质泥岩 镓 富集 找矿前景 

分 类 号：P618.74[天文地球—矿床学] P534.46[天文地球—地质学]