5 - Diagenesis

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Concavo-Convex Contact0.27 mmwww.gly.uga.edu/railsback/PDFimage0208a.htmlSutured/Concavo-convex contacts2.4 mmwww.gly.uga.edu/railsback/PDFimage0212.htmlDissolution• Silicate and carbonate mineralsdissolved under conditions that are theopposite for cementation• Calcite and silicates show oppositebehaviour – conditions for precipitation ofthe one are favourable for dissolution ofthe other
Factors influencing the solubility ofCaCO3 http://www.usask.ca/geology/classes/geol243/243notes/243week10a.htmlhtmlFeldspar dissolution and calcite cement(high-pH conditions)http://faculty.gg.uwyo.edu/heller/Sed%20Strat%20Class/SedStratL1/slideshow_1_7.htmCementation• Development of new precipitates in pore spaces• Carbonates (calcite) and silicates (quartz) mostcommon, also clays in siliciclastic rocks• May be in response to groundwater flow,increasing ionic concentration in pore waters, andincreased burial temperatures• Overgrowths or microcrystalline cement whenhigh pore-water concentrations of hydrous silica• Iron oxide (hematite, limonite) determined byoxidation state
Page 1 and 2: DiagenesisChapters 5, 6, 7Diagenesi
Page 3 and 4: Boggs 2001BioturbationCarbonates•
Page 5: Diagenetic ProcessesMcIlreath and M
Page 9 and 10: Chlorite CementBoggs 2001Illite cem
Page 11 and 12: Mineral Replacement• Dissolution
Page 13 and 14: Diagenetic Structures• Liesegange
Page 15 and 16: SEM image of quartzovergrowth (Q),c
Page 17 and 18: Secondary Porosity• Development o
Page 19 and 20: Secondary porosity - Dakota Fm.Inte
Page 21 and 22: van Krevelen plotSummary• Diagene

5 - Diagenesis

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