兰坪-思茅盆地钾盐成矿研究现状及存在的问题  

RESEARCH STATUS AND ISSUES OF POTASH MINERALIZATION IN LANPING-SIMAO BASIN

作　　者：苗忠英[1] 吕苑苑[1] 高磊[2] 刘松 

机构地区：[1]中国地质科学院矿产资源研究所国土资源部盐湖资源与环境重点实验室,北京100037 [2]中国煤炭地质总局第四水文地质队,河北邯郸056001 [3]中国石油天然气管道局东南亚项目经理部,河北廊坊065000

出　　处：《资源与产业》2017年第3期24-33,共10页Resources & Industries

基　　金：中国地质调查二级项目(N1611)

摘　　要：兰坪-思茅盆地目前是我国唯一的固体钾盐产区,随着勘探程度的深入,其钾盐储量有望进一步增加,为保证国家粮食产量和粮食安全提供有利支撑。文章综述了近年来公开发表的兰坪-思茅盆地钾盐成矿方面的相关文献,得出:1)兰坪-思茅盆地处于特提斯钾盐成矿域,尽管盆地内已经发现了勐野井钾盐矿,但是其规模较小,更大规模的钾盐矿有待被发现;2)盆地以中—新生界沉积盖层为主,下三叠统因构造抬升而缺失,中—上三叠统为海相地层,侏罗系为海陆过渡相,白垩系及以上地层为陆相沉积;3)盆地内钾盐的产层为勐野井组,主要含钾矿物为钾石盐,其次为光卤石;4)Br的相对含量和δ^(11)B、δ^(34)S_(CDT)、^(87)Sr/^(86)Sr的值显示盐岩物源以海水为主,同时受陆源水和火山活动的影响;5)钾盐矿床化学类型、成盐物质来源和成盐时代等方面与呵叻盆地相似,但呵叻盆地主要的含钾矿物为光卤石。针对兰坪-思茅盆地钾盐资源勘查,在今后的工作中需进一步厘清成盐物质来源和成盐时代,也需要加强与邻区钾盐成矿模式的对比研究。Lanping-Simao basin is the only known basin producing solid potash with its reserve probably to be increased as exploration goes forwards, providing supports in China＇s crop production and security. This paper reviews published references regarding Lanping-Simao basin in potash mineralization. 1 ） Lanping-Simao basin is located within Tethys potash mineralization domain with only a small discovery Mengyejing sylvite mine with potential for large discovery; 2 ） Basin is composed of Mesozoic-Cenozoic cap, with lower Triassic missing due to lift, middle to upper Triassic marine facies, Jurassic marine-continental transitional facies, and Cretaceous and upper continental sediments; 3） The strata bearing potash is Mengyejing formation with sylvite and carnallite; 4） Br and δ^11HB, δ^SCDT, ^87Sr/^86Sr imply a marine source, and less blended with continental and volcanic resource; 5 ） Its chemicals, potash mineralization source and age are similar with Thai Khorat basin whose major potash mineral is carnallite. This paper presents suggestion for exploration in Lanping-Simao basin in further clarifying the source of potash and mineralization age and in boosting mode comparison with its adjacent potash areas.

关 键 词：兰坪-思茅盆地 钾盐 微量元素 同位素 成矿机理 

分 类 号：P619.211[天文地球—矿床学]