兰坪—思茅盆地古新统粘土矿物研究与成盐环境探讨

Clay Minerals of Paleocene in Lanping-Simao Basin and A Tentative Discussion of Salt-forming Environment

中文关键词:  兰坪—思茅盆地  粘土矿物  XRD  成盐阶段  成盐环境

英文关键词:Lanping-Simao basin  Clay minerals  XRD  Salt-forming epoch  Salt-forming environment  

中文摘要:

      云南兰坪—思茅盆地是我国重要的成钾盆地,对盆地内勐野井组层位的泥砾岩段(成盐阶段)粘土样品进行XRD分析;同时对滇中楚雄盆地的相同层位(元永井组)粘土样品进行了XRD对比分析。实验结果表明,兰坪—思茅盆地内的样品中粘土矿物组合为伊利石+绿泥石,表明了在成盐阶段较为干旱的古气候条件与较高的古盐度;而楚雄盆地一平浪样品中除伊利石+绿泥石组合外,还含有伊利石/蒙皂石混层矿物,反映了当时的古气候条件与兰坪—思茅盆地相比较为湿润。通过计算样品中各种粘土矿物的相对含量,指出兰坪—思茅盆地成盐阶段更晚,成盐作用更强。结合前人的研究成果探讨了兰坪—思茅盆地的成盐环境,指出盆地南部卤水较北部浓缩程度更高,南部成盐条件优于北部。

英文摘要:

      Yunnan Lanping-simao basin is an important basin with K salt deposition in China.The clay minerals samples exist in Paleocene Mengyejing formation of muddy gravel phase(salt-forming epoch) in Lanping-simao basin including the samples of the same strata(Yuanyongjing Formation) in Chuxiong basin of central Yunnan are experimented by the method of XRD.The experiment results show that the dominant assemblage of clay minerals in Lanping-simao basin are illite and chlorite,and indicates that the dry paleoclimate ...