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Table 1 Major-element chemical composition expressed as oxide weight percent of representative samples of Euganean trachyte from the Renaissance city walls of Padua determined by LA-ICPMS, on both surface (i.e., weathering crust or patina) and host rock (inner part)

From: Trachyte weathering in the urban built environment related to air quality

Sample SiO2 TiO2 Al2O3 Fe2O3 MnO MgO CaO Na2O K2O P2O5 SO3
Calcite-rich alteration
SCR-01
 Surface 8.57 0.02 1.14 0.58 0.04 1.49 85.85 0.17 0.12 0.69 0.38
 Host rock 63.69 0.12 18.09 0.76 0.01 0.14 4.40 6.18 4.56 0.04 0.45
GAR-03
 Surface 52.04 0.17 13.40 3.98 0.31 1.21 16.29 3.28 0.83 3.21 1.18
 Host rock 67.17 0.09 18.08 0.91 0.00 0.20 1.51 5.75 5.70 0.12 0.10
CSN-03
 Surface 55.10 0.40 11.59 3.51 0.09 1.51 15.60 3.00 0.97 1.42 2.93
 Host rock 65.78 0.11 18.31 2.04 0.01 0.35 1.03 5.82 5.63 0.04 0.06
SCR-05
 Surface 58.50 0.19 13.81 3.31 0.05 0.72 10.42 2.77 0.55 1.22 0.44
 Host rock 67.89 0.30 15.96 1.97 0.02 0.59 1.69 5.26 5.21 0.17 0.12
Iron-rich alteration
SCR-07
 Surface 40.97 0.39 14.27 21.19 0.15 1.22 5.22 1.96 0.57 7.47 0.82
 Host rock 68.09 0.15 17.23 1.34 0.02 0.40 1.21 5.32 5.64 0.10 0.08
Weak alteration
FST-07
 Surface 66.20 0.13 17.71 2.99 0.12 0.33 3.73 5.07 0.91 0.72 0.65
 Host rock 69.08 0.06 16.46 0.84 0.01 0.12 2.01 5.20 4.33 0.07 0.11
Gypsum-rich alteration
FST-05
 Surface 5.44 0.01 0.41 0.11 0.00 0.17 66.07 1.34 0.12 0.58 24.87
 Host rock 70.62 0.23 14.93 1.29 0.01 0.32 1.05 4.01 6.32 0.03 0.19
Average composition of Euganean trachytea 66.02 0.66 16.77 3.26 0.06 0.66 1.42 5.04 5.35 0.21 0.01
  1. The samples are divided by different types of alteration and sampling location as in Fig. 2 (SCR, Bastione Santa Croce; GAR, Torrione dell’Arena; CSN, Bastione Castelnuovo; FST, Torrione Venier)
  2. a Bulk-rock chemical composition determined by X-ray fluorescence and averaged among 86 fresh trachyte samples collected on the Euganean Hills in 40 different quarries and outcrops [32]