Changes

The changes in mechanical conditions in the area are tied to digenetic events. Different alteration processes may increase rigidity such as dewatering, compaction, consolidation, geothermal heating, cementation, and recrystallization due to pressure solution. Also, poor lithification caused changes in rigidity contrast between layers and therefore inhibited joint propagation. Additionally, a fine sandstone layer with previously high porosity and permeability may undergo diageneses and mineral precipitation which changed the properties, resulting in a stiffer layer than before. Later burial and compaction, the sandstone may be stiffer with higher rigidity contrast allowing more through-going joint to develop.

The changes in mechanical conditions in the area are tied to digenetic events. Different alteration processes may increase rigidity such as dewatering, compaction, consolidation, geothermal heating, cementation, and recrystallization due to pressure solution. Also, poor lithification caused changes in rigidity contrast between layers and therefore inhibited joint propagation. Additionally, a fine sandstone layer with previously high porosity and permeability may undergo diageneses and mineral precipitation which changed the properties, resulting in a stiffer layer than before. Later burial and compaction, the sandstone may be stiffer with higher rigidity contrast allowing more through-going joint to develop.

==Conclusion==

====Conclusion====

Mechanical stratigraphy can evolve through time as a result of diagenetic processes and not necessarily the original depositional fabric and properties of the rock. Different alteration processes change mechanical properties for different rock types. For example, for carbonate rocks dolomitization, recrystallization, and changing from aragonite to calcite alter rigidity contrast. Other types of rocks such as clastics are affected by frost welding and thermal heating or cooling which also change rigidity and stress and strain rock response.

Mechanical stratigraphy can evolve through time as a result of diagenetic processes and not necessarily the original depositional fabric and properties of the rock. Different alteration processes change mechanical properties for different rock types. For example, for carbonate rocks dolomitization, recrystallization, and changing from aragonite to calcite alter rigidity contrast. Other types of rocks such as clastics are affected by frost welding and thermal heating or cooling which also change rigidity and stress and strain rock response.