Permeability Changes Resulting from Quartz Precipitation and Dissolution around Upper Crustal Intrusions

Figure 12

Temporal evolution at two locations near an intrusion emplaced in host rocks with high initial permeability and primary porosity of 0.025. Subplots (a–g) show properties at a point along the margin of the intrusion (shown as the yellow star in Figure 9(c)), and subplots (h–n) show properties within the low permeability barrier nearer the center of the intrusion (the purple star in Figure 9(c)). Fluid and rock properties displayed include (a, h) temperature and fluid pressure shown with red and blue lines, respectively, (b, i) vapor saturation, (c, j) vertical liquid and vapor mass flux (shown with blue and red lines, resp.), (d, k) quartz solubility, (e, l) rate of quartz precipitation/dissolution, (f, m) porosity, and (g, n) permeability.