Evaluation of CO₂-Fluid-Rock Interaction in Enhanced Geothermal Systems: Field-Scale Geochemical Simulations

Table 2

Mineral assemblages of core samples from Precambrian granite in Arizona well 22-1X State in the St. John’s CO₂ field.

Minerals	Minerals composition (Sample 1 at 640.8 m)	Minerals composition (Sample 2 at 647.4 m)
Quartz	50%	45%
Plagioclase	26%	30%
K-feldspar	21%	19%
Biotite	1%	2%
Muscovite	2%	3%
Total	100%	99%