Diagenetic albitization of K-feldspar and plagioclase is a common diag
enetic phenomenon in numerous sedimentary basins. Three geochemical co
des (DISSOL, THERMAL, and KINDIS) are used to simulate these albitizat
ion reactions in terms of fluid chemistry and temperature. The geochem
ical codes show that albitization of K-feldspar is enhanced by increas
ing temperature, and is most likely to occur at 120-150 degrees C. Kin
etic modeling of this reaction predicts the instability of quartz, whi
ch is generally considered a K-feldspar albitization product. Albitiza
tion of plagioclase is shown to decrease with increasing temperature.
For low pCO(2) conditions it probably occurs between temperatures of 6
0 degrees C and 100 degrees C, while for higher values of pCO(2) it co
ntinues at temperatures greater than 100 degrees C.