宁晋—辛集石盐田石盐矿床特征及其成因探讨

Characteristics and genesis of halite deposit in Ningjin-Xinji halite field

为了进一步查明宁晋—辛集石盐田石盐矿床的基本特征,采用二维地震、钻探、采样化验等综合勘查方法开展了石盐资源普查工作,对束鹿凹陷宁晋—辛集石盐田含盐范围、矿体厚度、矿石品位等进行了分析,并结合以往研究资料探讨了构造条件、沉积环境及古气候等成矿影响因素。结果表明:宁晋—辛集石盐田含盐面积约202 km^2,矿床厚度34.23~323.25 m,NaCl平均含量为86.08%,盐田石盐矿332+333+(334)?资源总量共计367.57亿t,矿床规模属大型。古地貌和构造条件为盐类物质的沉积提供可容空间,周缘凸起老地层的剥蚀为盐类物质的沉积提供了丰富的物源,区内次级凸起的分隔性决定了水体的封闭性,有利于古湖水的咸化,耦合干旱炎热的古气候条件,古盐湖蒸发浓缩形成了束鹿凹陷巨厚层状的石盐矿床。

Census work of halite resources has been carried out to ascertain basic feature of halite deposit in Ningjin-Xinji halite field,based on comprehensive exploration method of 2-D seismic,exploration drilling and sampling test.Meanwhile,salinity range,orebody thickness and mineral taste have been analyzed in Ningjin-Xinji halite field of Shudong depression.And combined with previous studies,metallogenic factors were discussed of structural conditions,sedimentary environment and the ancient climate.The results showed,the salt area of Ningjin-Xinji halite field is about 202 km^2.Orebody thickness are 34.23 ~ 323.25 m.The mean content of Na Cl is 86.08%.The total amount of salt resources is 332 + 333 +(334) ? 367.57 billion tons.The scale of the deposit is large.Palaeogeomorphology and tectonic conditions can afford a space for deposition of salt material.The erosion of the old stratum in the periphery provides rich for the deposition of salt material.The separation of the secondary bulge determines the closure of the water,which is conducive to the salinization of the ancient lake.The large and thick halite field is based on the ancient climate of drought heat and evaporates and condensed of ancient lake in Shudong depression.