5 - Diagenesis

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Micrite envelopeshttp://geology.uprm.edu/Morelock/GEOLOCN_/7_image/micrit.jpgDiagenetic Processes• Mesodiagenesis: four main processes:• Compaction• Dissolution• Precipitation• RecrystallizationPress and Siever 2001
Diagenetic ProcessesMcIlreath and Morrow 1990Compaction• Loosely packed sand porosity approaches25%; saturated mud 60-80% water. Porosityreduced during burial due to overburdenpressure• Fabrics may form identifiable in thin sectionincluding: deformation, distortion, flattening• Pseudomatrix formation when rock fragmentsalter to clays under pressure – looks like aprimary clay matrix• Pressure solution where grain boundariesundergo dissolution and crystallizationCompactionBoggs 2001
Page 1 and 2: DiagenesisChapters 5, 6, 7Diagenesi
Page 3: Boggs 2001BioturbationCarbonates•
Page 7 and 8: Factors influencing the solubility
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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