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

尽管对白云岩的成因进行了大量的研究，但仍存在争议。更好地了解白云岩的形成不仅是对地球科学的重大贡献，而且具有重要的经济影响，因为白云岩构成了世界主要石油储量的碳氢化合物储层，并拥有世界上近一半的铅和锌矿床。拟议的研究将旨在确定白云石化的性质和过程及其对不同构造背景下白云岩储层形成的影响。它将识别不同类型的钙钛矿，绘制出它们的空间分布图，并建立它们的共生关系。 它将采用O、C和Sr同位素方法和流体包裹体显微测温法来表征白云石化流体的性质并限制白云石化的时间。短期目标是更好地了解加拿大萨斯喀彻温省Frobisher层和下Shaunavon组以及中国西北部塔里木盆地寒武系白云岩中的石化作用。长期目标是通过调查和比较不同构造背景下橄榄岩的时空分布、岩相学和地球化学特征，提高我们对橄榄岩化的性质和过程的认识。

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.