杂卤石是一种重要的含钾矿物，杂卤石矿是我国钾盐工业发展的重要接替钾资源。柴达木盆地北部昆特依盐湖中赋存大量杂卤石，但较低的研究水平已经制约了对该矿物的进一步利用。本项目拟在昆特依盐湖大盐滩矿区以杂卤石沉积为对象，利用综合方法开展研究。通过对钻孔岩芯的矿物学和岩相学分析，查明杂卤石矿的矿物组成和杂卤石的赋存特征，区分不同成因的杂卤石；通过原生石盐包裹体研究，揭示原始成盐母液的组分特征及其变化规律；利用EQL/EVP和PHREEQC程序对获取的各类水体水化学数据进行地球化学模拟，结合硼同位素组成分析，确定对成矿流体形成有重要贡献的水体，讨论水体蒸发过程中的析盐序列及成矿流体的演化过程。在上述研究的基础上，系统阐释研究区成矿流体演化过程及其与杂卤石形成之间的内在联系。本项目的实施将丰富内陆盐湖杂卤石成矿理论，为该地区杂卤石矿的开发提供理论支持，对类似矿床的研究也具有借鉴意义。

Polyhalite is an important potassium-containing mineral and polyhalite deposits will be a replaceable potash resource for development of potash industry in China. Although there exist voluminously polyhalite deposits in Kunteyi Playa of north Qaidam Basin, the utilization of this mineral has been seriously subject to constraint of the low-level or poor study in this area. Choosing the polyhalite in Dayantan mining area of Kunteyi Playa as the main research object, the study will be carried out with comprehensive methods. Through mienralogical and lithological analyses of drillcore samples, the mineral component of polyhalite deposit and the ocuurence feature of polyhalite will be made sure, and the polyhalites with different origins will be identificated. By studying on primary fluid inclusions in halites, the information of environmental temperature and main components of original ore-forming fluids will be obtained and the natures of main components and their variation rule will be revealed. Through the hydrogeochemical simulation by EQL/EVP and PHREEQC computer program, combining analysis of boron isotope composition of natural waters, the main contributors for formation of ore-forming fluids will be confirmed, the salting-out sequences of various water bodies during evaporation and the evolution of ore-forming fluids will be discussed. Based on those study results mentioned above, the evolution of ore-forming fluids will be deciphered and the intrinsic connection relationship between ore-forming evolution and formation of polyhalite deposits will be systematically elucidated. The execution of this project will enrich the ore-forming theory of polyhalite deposit in inland salt lake and be able to provide the theoretical support for exploiting the polyhalite deposits in study area. At same time, these study results will play a significant reference role when studying the analogous deposits.