Origin of dolomite and formation of dolomite reservoirs in different tectonic settings

尽管对白云岩的起源进行了大量的研究，但仍存在争议。更好地了解白云岩的形成不仅对地球科学有重大贡献，而且对经济也有重要影响，因为白云岩构成了世界主要石油储量的油气储集层，并且拥有世界上近一半的铅锌矿。建议的研究将旨在确定白云化的性质和过程及其对不同构造环境下白云岩储层形成的影响。识别不同类型的白云岩，绘制其空间分布图，建立其共生关系。它将采用O、C和Sr同位素方法和流体包裹体显微测温来表征白云化流体的性质，并限制白云化的时间。短期目标是更好地了解加拿大萨斯喀彻温省Frobisher地层和下Shaunavon组的白云化作用，以及中国西北部塔里木盆地的寒武系白云岩。长期目标是通过研究和比较不同构造环境下白云岩的时空分布、岩石学和地球化学特征，提高我们对白云化性质和过程的认识。

The origin of dolomite remains controversial despite a great deal of research on this topic. A better understanding of the formation of dolomite is not only a significant contribution to geoscience but also has important economic impacts because dolomite constitutes hydrocarbon reservoirs for major world petroleum reserves and hosts nearly half of the world's lead and zinc deposits. The proposed research will be aimed at determining the nature and processes of dolomitization and their implications for the formation of dolomite reservoirs in different tectonic settings. It will identify different types of dolomites, map out their spatial distributions, and establish their paragenesis. It will employ O, C and Sr isotopic methods and fluid inclusion microthermometry to characterize the nature of dolomitizing fluids and to constrain the timing of dolomitization. The short-term objective is to achieve a better understanding of dolomitization in the Frobisher Bed and the Lower Shaunavon Formation in Saskatchewan Canada and the Cambrian dolomite in the Tarim Basin in northwestern China. The long-term objective is to advance our knowledge of the nature and processes of dolomitization by investigating and comparing temporal and spatial distributions, petrographic and geochemical signatures of dolomites in different tectonic settings.