Table 2 Trace-element chemical composition expressed as ppm 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). Only a selection of the analyzed elements is showed (the complete dataset is included in Additional file 1)

Calcite-rich alteration

SCR-01

 Surface

23.00

6.50

2.95

15.80

261.00

3660.00

25.80

10.50

13.70

6.29

48.95

176.60

0.92

 Host rock

3.49

2.32

0.68

1.58

12.09

57.50

2.40

0.17

1.58

0.25

123.34

8.24

0.05

GAR-03

 Surface

87.20

115.00

14.70

75.20

865.00

1042.00

53.90

11.70

67.60

25.80

210.83

587.00

4.93

 Host rock

3.29

1.14

1.00

1.51

15.40

116.70

1.05

0.68

1.41

0.11

61.86

15.50

0.05

CSN-03

 Surface

42.30

84.00

9.70

58.90

481.00

523.00

56.00

3.80

22.90

6.40

138.93

389.00

1.14

 Host rock

4.08

0.64

1.79

0.96

8.32

93.30

1.12

0.24

1.67

0.22

61.29

29.30

0.05

SCR-05

 Surface

420.00

70.00

7.25

35.50

352.00

11460.00

55.40

8.85

50.50

32.60

199.78

25800.00

2.57

 Host rock

5.46

10.06

2.78

1.74

22.60

1582.00

1.98

0.50

3.74

0.27

236.71

8.39

0.05

Iron-rich alteration

SCR-07

 Surface

505.00

211.00

16.50

72.70

1009.00

6210.00

385.00

63.10

94.60

34.20

386.86

24900.00

45.50

 Host rock

2.99

0.79

1.60

1.50

30.00

65.80

1.04

0.15

0.92

0.17

130.32

8.21

0.03

Weak alteration

FST-07

 Surface

42.50

5.00

6.80

48.00

384.00

871.00

10.60

5.52

24.40

6.45

176.81

280.00

2.33

 Host rock

1.88

0.78

1.06

6.50

18.50

73.40

0.64

0.24

1.51

0.13

65.27

5.46

0.02

Gypsum-rich alteration

FST-05

 Surface

10.27

3.90

1.28

4.75

23.80

24.60

11.00

0.08

1.45

1.97

9.88

22.13

0.10

 Host rock

10.10

1.26

1.73

2.42

16.10

41.50

2.04

0.19

2.28

0.30

149.32

10.52

0.06

Average composition of Euganean trachyte^a

23

3

3

2

23

103

n/a

n/a

n/a

n/a

n/a

15

n/a