摘要
经过几年的地质勘查工作，１９９１年，终于查明了中国第一座杂卤石矿床，它的含钾量相当于一座中型规模的氯化钾矿床。杂卤石矿床赋存并富集于下中三叠统二级背斜鞍部，与石膏和硬石膏共生，交互成层，并受其控制和保护；矿床具有以杂卤石矿为中心的对称沉积韵律，一方面是潮上膏坪环境浅水盆地中的残余浓缩卤水与石膏发生同生交代作用形成，另一方面又是膏坪汇流水与残余浓缩卤水混合蒸发沉积而成。杂卤石矿化学成分接近理论值，Ｋ２Ｏ含量平均８％。矿石经系统农业肥效试验证明增产显著。在一定条件下，矿粉能完全溶于水，并可提纯为商品钾盐以至硫酸钾化学纯。杂卤石矿可为工业利用。除介绍杂卤石矿的识别方法外，作者还引进非金属矿床含矿建造的概念，根据与杂卤石矿共生的岩石组合特征、矿床形成时所处的大地构造环境，指出杂卤石矿赋存于海相碳酸盐岩—硫酸盐岩建造中。这一建造也就是寻找杂卤石矿（及与其共生伴生的其它非金属矿）的方向和目标。
By the geological exploration in a few years,the first polyhalite deposit of China was finally proved,whose K reserves is equal to a kalium chloride deposit in medium scale. It exists and concentrates in the saddle of an orderⅡanticline of lower-middle Triassic,coexisting and alternating with gypsum and anhydrite, controlled and protected by them.There is a symmetric sedimentary rhythm with a polyhalite center in this deposit,formed by the cogenetic metasomasis of relic concentrated brine with gypsum in shallow basin of the gypsum flat environment above tidal level and the evaporation sedimentation of the mixture of gypsum flat drainage water with rilic concentrate brine.The chemical composition of polyhalite is similar to the theoretical value,K20 average 8%.Through the systematic fertility test,the ore has been proved to be evidently availabe in agriculture to increase production.Under some conditions,the ore powder is competely soluble in water and can be purified to produce commercial kalisalt,even kalisulphate with chemical purity.Besides briefing on the identification method of polyhalite ore,this paper refers to the concept of ore formation of nonmetallic deposit and points out that this polyhalite deposit exists in the ocean facies cabornate rock -sulphate rock formation according to the rock assemblge paragenetic with polyhalite and the geotectonic environment during forming ore deposit.This ore formation is the direction and target in searching for polyhalite ore(and the other nonmetallic ore accompanying,coexisting with it).
出处
《云南地质》
1996年第1期52-61,共10页
Yunnan Geology
