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Line 30:
Line 30: − + − ! Temp. − ! Major diagenetic processes − ! Preserves or enhances porosity − ! Destroys porosity − + − | − − | * Grain coatings (inhibit later overgrowths) * Nonpervasive carbonate cements that can be dissolved later − − | * Clay infiltration * Carbonate or silica cement (in some cases irreversible) * Authigenic kaolinite * Compaction of [[Ductility|ductile]] grains − − + − + − + − + − | * Kaolinite, chlorite, and illite precipitate as a result of feldspar dissolution * Ferroan carbonate and quartz cement+ − + + + + + + + + + + + + − + − + − + − + − + + + + +
Sandstone diagenetic processes (view source)
Revision as of 16:54, 3 November 2014
, 16:54, 3 November 2014→Diagenetic zones
{| class = "wikitable"
{| class = "wikitable"
|-
|-
! Zone
! rowspan = 2 | Zone || rowspan = 2 | Temperature || colspan = 2 | Major diagenetic processes
|-
|-
| Shallow
! Preserves or enhances porosity || Destroys porosity
|-
|-
| Intermediate
| Shallow || <80°C or 176°F (<5,00 to 10,00 ft)
| [[temperature::80-140°C]] or 176–[[temperature::284°F]]
|
| * Carbonate cement dissolved * Feldspar grains dissolved
* Grain coatings (inhibit later overgrowths)
* Nonpervasive carbonate cements that can be dissolved later
|
* Clay infiltration
* Carbonate or silica cement (in some cases irreversible)
* Authigenic kaolinite
* Compaction of [[Ductility|ductile]] grains
|-
| Intermediate || 80-140°C or 176–284°F
|
* Carbonate cement dissolved
* Feldspar grains dissolved
|
* Kaolinite, chlorite, and illite precipitate as a result of feldspar dissolution
* Ferroan carbonate and quartz cement
|-
|-
| Deep
| Deep
| > [[temperature::140°C]] or [[temperature::284°F]]
| > 140°C or 284°F
| * Feldspar, carbonate, and sulfate minerals dissolved
|
* Feldspar, carbonate, and sulfate minerals dissolved
| * Quartz cement (most destructive) * Kaolinite precipitation * Illite, chlorite form as products of feldspar dissolution * Pyrite precipitation
|-
|
* Quartz cement (most destructive)
* Kaolinite precipitation
* Illite, chlorite form as products of feldspar dissolution
* Pyrite precipitation
|}
|}