地质通报2025，Vol.44Issue(9)：1607-1628,22.DOI:10.12097/gbc.2023.07.014
黔北万山地区含钾页岩中钾的赋存状态、富集机制及资源利用前景
Occurrence state,enrichment mechanism and resource potential of potassium in potassium-bearing shale in the Wanshan area,Northern Guizhou,China
摘要
Abstract
[Objective]China is rich in insoluble potassium mineral resources,especially in the Wanshan area of Guizhou Province.However,the occurrence state and enrichment mechanisms of potassium in potassium-bearing shales remain poorly understood.[Methods]We focus on the potassium-bearing shales in the Wanshan area of Guizhou Province,conducting systematic mineralogical and elemental geochemical analyses to evaluate potassium enrichment processes and utilization potential.[Results]In potassium-bearing shales,potassium primarily occurs in an ionic form within microcline(42.43%～74.22%),followed by illite(<25.27%),with minor amounts present in illite-smectite mixed-layer minerals(<5.10%).The ratios of Al/(Al+Fe+Mn),Fe/Ti,(Fe+Mn)/Ti,MnO/TiO2,U/Th,LaN/CeN,and LaN/YbN,along with the K2O/Na2O-SiO2/Al2O3,SiO2-K2O/Na2O,SiO2-Al2O3,and Cr-Zr diagrams,as well as the rare earth element(REE)distribution patterns,collectively indicate that the potassium-bearing shales were formed in a passive continental margin,with sedimentary materials primarily derived from terrigenous debris.The Al2O3/TiO2 ratios in the potassium-bearing shales range from 21.37 to 30.17(average 25.28),and the Sc/Th ratios range from 0.85 to 1.20(average 1.08),indicating a source material derived from felsic rocks.The values of U/Th,authigenic U,δU,V/Cr,Ni/Co,and V/(V+Ni)consistently indicate that the potassium-bearing shales were formed in an oxidizing environment.The CIA values and ICV values of potassium-bearing shales are 60.78～71.04(average 64.99)and 1～1.72(average 1.18),respectively,reflecting that the sedimentary material has undergone moderate weathering.[Conclusions]Integrated A-CN-K diagram and mineralogical composition of rocks indicate that potassium metasomatism,involving the replacement of plagioclase by K-feldspar during weathering,significantly promoted potassium enrichment.Potassium resources in potassium-bearing shales are difficult to utilize effectively in the short term.However,with future increases in potassium demand and advancements in extraction technology,they may hold significant potential for utilization.关键词
含钾页岩/钾富集/赋存状态/物质来源/贵州万山Key words
potassium-bearing shale/potassium enrichment/element occurrence/material source/Wanshan,Guizhou Province分类
天文与地球科学引用本文复制引用
李松涛,苏特,黄丹,周光红,张兵强,蒋天锐,杨成富,赵富远,王泽鹏,钱应强,谢小明,赵平..黔北万山地区含钾页岩中钾的赋存状态、富集机制及资源利用前景[J].地质通报,2025,44(9):1607-1628,22.基金项目
铜仁市科技局基础研究计划项目《铜仁地区钾矿资源富集规律及靶区优选研究》(编号:铜市科研[2021]39号)和教育部"春晖计划"合作科研项目《贵州滥木厂矿床关键金属铊超常富集机制》(编号:HZKY20220235) Supported by Basic Research Program of Tongren Science and Technology Bureau(No.Tongshikeyan[2021]39)and"Chunhui Plan"Cooperative Scientifc Research Project of Ministry of Education of China(No.HZKY20220235) （编号:铜市科研[2021]39号）
