布谷马西地区白垩系下统盐类沉积特征及沉积旋回划分  

THE SALT DEPOSIT FEATURES AND SEDIMENTARY CYCLE DIVISION OF LOWER CRETACEOUS IN CUCKOO MARCY REGION

作　　者：栾元滇 岳伟佳 孟令远 

机构地区：[1]山东省地矿工程勘察院,山东济南250014 [2]烟台市水文水资源勘测局,山东烟台254000

出　　处：《化工矿产地质》2014年第4期208-214,共7页Geology of Chemical Minerals

摘　　要：布谷马西地区大地构造位于刚果盆地中部,盆地基底为元古界,上覆厚层白垩系。该区发现多处钾盐矿,均产于白垩系下统盐类沉积中。盐类沉积为光卤石岩和石盐岩互层韵律沉积,其间发育连续分布的沥青页岩4层,以该4层沥青页岩为标志,将盐类沉积划分为4个沉积旋回,每一旋回均为一次大的沉积事件。其中Ⅰ旋回、Ⅲ旋回上部、Ⅳ旋回中部光卤石岩沉积厚度较大,为钾盐矿主矿层赋矿层位,Ⅳ旋回顶部也是钾石盐型钾盐矿的成矿有利地段。Cuckoo Marcy region is located in central Congo Basin which basement rock belongs to Proterozoic verlying thick bedded cretaceous layer. There are sevsral potash mines has been discovered all occur in Lower cretaceous salt deposit which are carnallitolite and halilyte alternating rhythmic sedimentation developing 4 continuously distributional bituminous shale, the salt deposit has been divided into 4 sedimentary cycle marked by this 4 layers,every of which is a Large sedimentary events. The depositional carnallitolite is thicker in Cycle Ⅰ, upper cycle Ⅲ and middle cycle Ⅳ which are hosting ledge of potash mine. Top cycle Ⅳ also is the regions favorable for mineralization.

关 键 词：布谷马西 白垩系下统 盐类沉积 沉积旋回 钾盐矿 

分 类 号：P619.211[天文地球—矿床学]