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→Telogenesis
==Telogenesis==
==Telogenesis==
Sandstone that undergo deep burial under several kilometers on depth can expose to the surface by mountain building activity and unroofed by erosion. Decrese the pressure and temperature dramatically changes the characteristic of sandtone. Previously formed cements and framework grains may undergo dissolution or alteration framework grain to clay minerals.<ref name=Bogg /> Other changes may include oxidation of iron carbonate minerals and other iron-bearing minerals to form iron oxides(Boggs, 2011). The telogenesis grade into those of subaerial weathering as sedimentary rocks are expose to the surface of Earth.<ref name=Bogg />
Sandstone that undergo deep burial under several kilometers on depth can expose to the surface by mountain building activity and unroofed by erosion. Decrese the pressure and temperature dramatically changes the characteristic of sandtone. Previously formed cements and framework grains may undergo dissolution or alteration framework grain to clay minerals.<ref name=Bogg /> Other changes may include oxidation of iron carbonate minerals and other iron-bearing minerals to form iron oxides (Boggs, 2011). The telogenesis grade into those of subaerial weathering as sedimentary rocks are expose to the surface of Earth.<ref name=Bogg />


==Porosity and Permeability==
==Porosity and Permeability==
Porosity and permeability of sandstone are of great interest for hydrogeologists and petroleum geologists. Porosity and permeability depict the interaction of grains in sandstone with fluid. Diagenesis and tectonics affect the quality of porosity and permeability. Diagenesis affects porosity and permeability through compaction and cementation. Compaction makes the arrangement of grains more closely packed, mechanically and chemically. Cementation precipitates secondary minerals, such as calcite, [[quartz]], and iron oxides, in the pores of sandstone.
Porosity and permeability of sandstone are of great interest for hydrogeologists and petroleum geologists. Porosity and permeability depict the interaction of grains in sandstone with fluid. Diagenesis and tectonics affect the quality of porosity and permeability. Diagenesis affects porosity and permeability through compaction and cementation. Compaction makes the arrangement of grains more closely packed, mechanically and chemically. Cementation precipitates secondary minerals, such as calcite, [[quartz]], and iron oxides, in the pores of sandstone.