How much pressure is needed to create limestone?

Answer 1

Limestone is primarily formed from the accumulation of calcium carbonate (CaCO3) through biological processes and sedimentation, rather than from high pressure. However, geological processes that contribute to the formation of limestone can involve pressures of around 3000 to 5000 psi (pounds per square inch) over millions of years, which can cause the compaction and cementation of sediments. This pressure is typically associated with the burial of sediments over time rather than a direct requirement for limestone formation.