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

尽管对白云石进行了大量的研究，但关于白云石的起源仍然存在争议。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集层，并拥有世界近一半的铅锌矿床。拟议的研究将旨在确定白云石化的性质和过程，以及它们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白云岩，绘制出它们的空间分布图，并建立它们的共生关系。它将利用氧、碳、锶同位素方法和流体包裹体显微测温来表征白云石化流体的性质，并约束白云石化的时间。短期目标是更好地了解加拿大萨斯喀彻温省Frobisher层和下Shaunavon组中的白云石化作用，以及中国西北部塔里木盆地中的寒武纪白云岩。长期目标是通过研究和比较不同构造环境中白云岩的时空分布、岩石学和地球化学特征，提高我们对白云岩作用性质和过程的认识。

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.