A self-consistent method of determining initial conditions for the model presented by Berner, Lasaga, and Garrels (1983) (henceforth, the BLAG model) is derived, based on the assumption that the CO2 geochemical cycle was in steady state at t = -100 my (million years). This initialization procedure leads to a dissolved magnesium concentration higher than that calculated by Berner, Lasaga, and Garrels and to a low ratio of dissolved calcium to bicarbonate prior to 60 my ago. The latter prediction conflicts with the geologic record of evaporite deposits, which requires that this ratio remain greater than 0.5. The contradiction is probably caused by oversimplifications in the BLAG model, such as the neglect of the cycles of organic carbon and sulfur.

中文翻译：

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BLAG模型评论；过去一亿年碳酸盐-硅酸盐地球化学循环及其对大气二氧化碳的影响

Berner、Lasaga 和 Garrels (1983) 提出的模型（以下称为 BLAG 模型）确定初始条件的自洽方法是基于 CO2 地球化学循环在 t = - 处于稳态的假设推导出来的100 我（百万年）。这种初始化程序导致溶解的镁浓度高于 Berner、Lasaga 和 Garrels 计算的浓度，并且导致 60 年前之前溶解的钙与碳酸氢盐的比率较低。后者的预测与蒸发岩矿床的地质记录相冲突，要求该比值保持大于0.5。这种矛盾可能是由于 BLAG 模型过于简化，例如忽略了有机碳和硫的循环。