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本文依据海水pH值演化和海气平衡理论,讨论了根据地层中沉积矿物共生组合恢复大气CO_2气分压值的理论和方法,研究了海水pH值的演化与碳酸岩层沉淀的关系,计算了地层中一系列与碳酸盐矿物伴生的沉积矿物组合生成的pH值范围及其所对应的大气CO_2气分压值。指出太古代沉积碳酸岩层虽然很少,但大气CO_2气含量却很高,且逐渐增多,直至形成稠密CO_2气圈。26×10~2Ma前后,CO_2气分压曾达10—50atm。从早元古代至现代表现为碳酸岩层沉积层位逐渐升高。最后超越硫化物层和硅酸盐粘土矿物层的总趋势,与此相应大气CO_2气分压值逐渐降低,由稠密CO_2气圈降为现在的0.03％,按CO_2气分压值的范围和波动特点可将其历史演变划分为三个历史阶段。
Based on the theory of seawater pH evolution and sea-air balance, the theory and method of restoring atmospheric partial pressure of atmospheric CO2 according to the symbiosis of sedimentary minerals in the strata are discussed. The relationship between the evolution of seawater pH and the precipitation of carbonate rock is studied. A series of carbonate minerals associated with sedimentary minerals generated by the combination of pH range and its corresponding partial pressure of atmospheric CO 2 gas. It is pointed out that although the Archean sedimentary carbonate rocks are rare, the content of atmospheric CO 2 gas is high and gradually increases until a dense CO 2 balloon is formed. Before and after 26 × 10 ~ 2Ma, partial pressure of CO_2 reached 10-50atm. From Early Proterozoic to modern times, the sedimentary horizon of carbonate rocks gradually increased. Finally, the general tendency of the sulphide and silicate clay mineral layers was surpassed. Correspondingly, the partial pressure of atmospheric CO 2 gas gradually decreased from the dense CO 2 balloon to the present 0.03%. According to the range and fluctuation of partial pressure of CO 2 gas, Features can be divided into three historical stages of its historical evolution.