Replacement of carbonate ooze containing metastable aragonite and magnesian calcite by magnesium-bearing solutions during diagenesis possibly occurs in various environments and under varying chemical conditions, but it is believed that secondary porosity developed in the calcite-dolomite replacement provides some of the avenues for ionic diffusion and for the escape of carbon dioxide. The intergranular film could play an important role in effecting transfer of magnesium ions in, and calcium ions out, through the unstable crystalline water meshwork in this film during late diagenesis.

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