< p >你为什么不认为方解石形成现场吗?饱和指数并不能保证方解石沉淀(或溶解),但是有很多原因。首先,方解石没有大的降雨动能障碍。动力学是相当迅速的。快速是一个相关名词但方解石的形成在钙质层和汪教授指出,不需太多的沉淀。其次,你认为这仅仅是巧合SI表明饱和?你有大量的水样本不同位置和方解石,都在平衡吗?怎么没有发生反应形成或方解石溶解吗?还有什么可以缓冲pH值平衡您的解决方案和方解石吗?< / p > < p >你看了石膏SI吗?它仍然欠饱和吗? If so you would expect it to be dissolving which would move calcite towards supersaturation. One possibility is that you in equilibrium with both gypsum and calcite. In that case, they will fix the ion concentrations in solution and pH so you get no further precipitation (assuming the system is closed to carbon dioxide).