Changes

Much diagenesis occurs in open chemical systems whose initial chemistry is set at deposition. After that, the chemistry of the system changes as flowing water moves chemical components through pores and causes either leaching or cementation of grains. Diffusion also moves chemicals in and out of rocks, although at significantly lower rates. During deep burial, chemical systems close and diagenesis is primarily by pressure solution and quartz overgrowths.<ref name=ch09r66>Wilson, M., D., 1994a, Non-compositional controls on diagenetic processes, in Wilson, M., D., ed., [[Reservoir quality]] Assessment and Prediction in Clastic Rocks: SEPM Short Course 30, p. 183–208. Discusses the effect that variables such as temperature and pressure have on diagenesis of sandstones. A good reference for predicting sandstone reservoir system quality.</ref>

Much diagenesis occurs in open chemical systems whose initial chemistry is set at deposition. After that, the chemistry of the system changes as flowing water moves chemical components through pores and causes either leaching or cementation of grains. Diffusion also moves chemicals in and out of rocks, although at significantly lower rates. During deep burial, chemical systems close and diagenesis is primarily by pressure solution and quartz overgrowths.<ref name=ch09r66>Wilson, M., D., 1994a, Non-compositional controls on diagenetic processes, in Wilson, M., D., ed., [[Reservoir quality]] Assessment and Prediction in Clastic Rocks: SEPM Short Course 30, p. 183–208. Discusses the effect that variables such as temperature and pressure have on diagenesis of sandstones. A good reference for predicting sandstone reservoir system quality.</ref>

Galloway<ref name=ch09r19>Galloway, W., E., 1984, Hydrogeologic regimes of sandstone diagenesis, in McDonald, D., A., Surdam, R., C., eds., Clastic Diagenesis: AAPG Memoir 37, p. 3–14.</ref> lists three types of flow of water in a basin:

Galloway<ref name=ch09r19>Galloway, W., E., 1984, [http://archives.datapages.com/data/specpubs/sandsto2/data/a059/a059/0001/0000/0003.htm Hydrogeologic regimes of sandstone diagenesis], in McDonald, D., A., Surdam, R., C., eds., Clastic Diagenesis: AAPG Memoir 37, p. 3–14.</ref> lists three types of flow of water in a basin:

* '''Meteoric flow'''—water infiltrates shallow portions of a basin from precipitation or surface waters. Deeper infiltration occurs from (a) eustatic sea level changes and/or (b) tectonic elevation of basin margins.

* '''Meteoric flow'''—water infiltrates shallow portions of a basin from precipitation or surface waters. Deeper infiltration occurs from (a) eustatic sea level changes and/or (b) tectonic elevation of basin margins.