Cements, Waters, and Scales: An Integrated Study of the Szeged Geothermal Systems (SE Hungary) to Characterize Natural Environmental Conditions of the Thermal Aquifer

Table 1

Mineralogical composition of the studied bulk rock samples and separated clay fractions.

	Major components (~mass%)	Minor components (~mass%)
Sand-rich samples (bulk)	q (20–50), 10A (10–60), dol (5–20)	cal (tr–10), 14A (5–10), kf (tr), pl (tr–10), 7A (tr)
Pelitic samples (bulk)	10A (10–60), q (20–40), 7A (tr–20), 14A (tr–20), dol (5–30), pl (tr–20)	cal (tr–10), kf (tr), pyr (tr)
Sand-rich samples (clay fraction)	10A (30–70), chl (20–60)	7A (5–10), sm (tr–10), q (tr), cal (tr), dol (tr)
Pelitic samples (clay fraction)	10A (40–80), chl (10–40), 7A (5–20)	sm (5–10), q (tr), cal (tr), dol (tr), pyr (tr)

Abbreviations: 14A = 14 Ångström phase (chlorite±vermiculite±smectite); 10A = 10 Ångström phase (illite±mica); 7A = 7 Ångström phase (kaolinite); cal = calcite; chl = chlorite; dol = dolomite; kf = K-feldspar; pl = plagioclase feldspar; pyr = pyrite; q = quartz; sm = smectite±highly swelling mixed-layer illite/smectite; tr = trace amount.