贵州铜仁中寒武统含钾页岩地质特征与钾富集规律研究  

Study on the Geological Characteristics and Potassium Enrichment of the Middle Cambrian Potassium-containing Shale in Tongren,Guizhou Province

作　　者：蒋天锐[1] 潘文[1] 苏特 施春华 涂灵玲 赵爽[1] 黄丹 周灵 高军波[2,3] JIANG Tianrui;PAN Wen;SU Te;SHI Chunhua;TU Lingling;ZHAO Shuang;HUANG Dan;ZHOU Ling;GAO Junbo(103 Geological Party,Guizhou Bureau of Geology and Mineral Exploration and Development,Tongren 554300,China;College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州省地质矿产勘查开发局一〇三地质大队,贵州铜仁554300 [2]贵州大学资源与环境工程学院,贵州贵阳550025 [3]贵州大学喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025

出　　处：《贵州大学学报（自然科学版）》2024年第4期28-33,共6页Journal of Guizhou University:Natural Sciences

基　　金：贵州省科技支撑资助项目(黔科合支撑[2024]一般128);铜仁市科技局基础研究计划资助项目(铜市科研[2021]39号)。

摘　　要：钾盐是中国生产钾肥的重要战略性矿产资源,中国可用于生产钾肥的可溶性钾矿资源非常短缺,难以保障国家粮食安全生产之需,而难溶性钾矿资源储量丰富,尤其在贵州铜仁地区中寒武统含钾页岩广泛发育。以铜仁地区中寒武统含钾页岩为研究对象,对含钾页岩地质特征、钾赋存状态和富集规律进行研究。结果表明:钾富集层主要赋存于寒武系中统敖溪组第二段(∈_(2)a^(2))含炭质粉砂质页岩中,厚度26~36 m,K_(2)O含量7%~14%,平均约9.59%。钾元素主要赋存形式为微斜长石和伊利石,初步认为富钾页岩物源很可能来自陆源长英质含钾长石的风化。微斜长石、伊利石等含钾矿物主要在台地边缘斜坡偏氧化水体中发生沉积,最终形成富钾页岩。Potassium salt is an important strategic mineral resource for the production of potassium fertilizer in China.However,the soluble potassium mineral resources in China are very scarce,causing it difficult to meet the needs of national food security production.Luckily,the reserves of insoluble potassium mineral resources are abundant,especially the middle Cambrian potassium-containing shale widely developed in Tongren,Guizhou Province.In this study,we take this shale in Tongren as the research object,and focus on the geological characteristics,potassium occurrence,and enrichment rules.The results show that the potassium enriched layer mainly exists in the second section of the middle Cambrian Aoxi Formation(∈_(2)a^(2)),with the thickness of 26-36 m and the K_(2)O content of 7%-14%(avg.=9.59%).The main occurrence of potassium is microcline and illite.and the source of potassium-containing shale is likely derived from the weathering of the terrestrial felsic potassium feldspar.Potassium containing minerals(e.g.,microcline and illite)mainly precipitated at the slightly oxidized water bodies on the slop of the platform margin,and formed the potassium-containing shale.

关 键 词：含钾页岩 地质特征 富集过程 中寒武统 贵州铜仁 

分 类 号：P612[天文地球—矿床学]