Vadose zone - Limestone quarry, Indiana. When rainwater moves through the soil it becomes slightly acidic (e.g. humic acid) which reacts with underlying limestone. The result is dissolution of limestone in the vadose zone (i.e. the zone above the ground water table) which increases the amount of dissolved calcite in the ground water. Later precipitation of the calcite in deposits through which the ground water flows produces carbonate cement filling the pore space.(Photo by Art Palmer)

RETURN TO LECTURE NOTES NEXT SLIDE SKIP TO SLIDE NUMBER Vadose zone Q + F grains in different light Rutilated quartz grain Quartz with fluid inclusions Chert grain Two types of feldspars Embayed feldspar & cement Sericitization of feldspar Volcanic lithic (Lv) Sedimentary lithic (Ls) Estimate QFL Tyee Formation Lookingglass Formation Silicate cement #1 Silicate cement #2 Two phases of cement Calcite attacks! Glauconite