Table 3 Trace element concentrations (in ppm) of the Riachuelos and Palma Sola beach sediments

Beach

Sample

RIA1

RIA2

RIA3

RIA4

RIA5

RIA6

RIA7

RIA8

RIA9

RIA10

RIA11

Ba

607

558

461

522

480

635

751

476

527

543

440

Co

15.1

16.86

14.6

14.9

16.0

17.3

14.3

15.6

14.8

18.7

24.2

Cr

67.9

77.6

78.2

68.0

72.8

79.3

61.2

81.6

71.4

94.8

131.4

Cs

1.99

1.53

1.42

0.6

0.64

1.93

2.28

1.58

1.78

1.71

1.36

Cu

25.4

23.5

22.8

20.3

21.4

24.4

22.4

25

26.8

24.5

21.6

Hf

4.69

4.21

3.78

3.47

3.03

4.77

4.91

4.69

3.31

4.16

3.65

Mo

1.42

1.25

1.22

1.18

1.07

1.35

1.46

1.06

1.21

1.23

1.07

Nb

17.9

17.2

16.4

15.3

13.6

18.7

20.6

16.9

17.6

17.1

14.2

Ni

26.7

30.4

33.6

26.0

31.2

31.5

21.4

37.6

28.7

34.8

53.2

Pb

13.1

10.7

11.6

10.46

9.49

11.7

13.1

12.7

9.83

10.77

8.93

Rb

56.6

45.3

32.8

26.9

24.3

55.5

61.3

40.8

37.9

50.8

36.9

Sc

12.7

12.81

13.6

7.91

8.35

19.2

21.8

15.9

18.6

14.95

22.7

Sr

477

471

450

427

412

501

598

466

437

460

371

Ta

5.84

5.47

4.86

4.95

4.3

6.15

8.89

5.38

4.69

6.11

4.6

Th

7.56

6.34

6.12

4.22

2.9

7.52

12.4

5.68

6.47

6.61

5.56

U

2.55

2.25

2.39

2.14

1.87

2.52

2.7

2.28

1.97

2.15

1.65

V

117

132

136

120

117

134

126

125

139

144

170

Y

12.3

12.8

10.6

8.75

8.2

12.9

18.7

9.67

11.9

14.8

18.5

Zn

59.0

59.0

52.6

53

53.5

60.7

67.4

54.8

58.7

71.1

79.2

Zr

171

154

115

128

112

171

173

126

130

143

118

Th/U

2.97

2.82

2.56

1.98

1.55

2.99

4.57

2.49

3.28

3.07

3.38

Rb/Sr

0.12

0.1

0.07

0.06

0.06

0.11

0.1

0.09

0.09

0.11

0.1

Ba/Sr

1.27

1.19

1.02

1.22

1.17

1.27

1.26

1.02

1.21

1.18

1.19

Beach

Sample

RIA12

RIA13

RIA14

RIA15

Mean ± 1 s (n = 15)

PAL1

PAL2

PAL3

PAL4

PAL5

PAL6

Ba

530

549

524

522

542 ± 77

482

368

414

412

488

380

Co

17.9

18.0

26.9

19.7

17.70 ± 3.63

7.78

10.2

8.6

9.68

11.9

11.4

Cr

68.3

86.6

148.5

70.6

83.9 ± 24.5

165

139

123

165

168

120

Cs

1.48

1.66

1.46

1.69

1.54 ± 0.45

1.59

1.42

1.41

1.56

1.6

1.58

Cu

23.0

20.9

26.0

26.0

23.60 ± 2.04

7.59

7.43

8.24

8.45

11.2

9.58

Hf

3.26

3.95

4.82

4.06

4.05 ± 0.63

2.26

2.15

2.83

3.45

3.92

2.78

Mo

1.31

1.18

1.24

1.16

1.23 ± 0.12

2.02

1.56

1.63

1.75

2.13

1.46

Nb

19.7

15.87

18.3

18.5

17.20 ± 1.92

7.08

7.69

7.98

7.26

11.5

10.5

Ni

29.4

33.23

60.0

34.46

34.1 ± 10.0

10.6

11.6

10.9

13.6

12.4

12.75

Pb

10.2

10.52

9.9

12.6

11.00 ± 1.35

6.79

5.63

6.35

6.47

6.65

5.89

Rb

29.5

46.6

41.4

44.6

42.1 ± 11.1

51.6

45.7

40.6

38.5

46.7

45.8

Sc

9.78

16.91

22.7

14.7

15.50 ± 4.86

4.94

5.12

5.36

10.3

10.9

9.7

Sr

461

474

452

480

462 ± 49

243

232

234

280

279

204

Ta

7.65

4.99

5.94

4.29

5.61 ± 1.26

0.45

0.44

0.52

0.51

0.66

0.58

Th

8.63

6.84

7.06

7.61

6.77 ± 2.09

3.21

2.58

3.4

3.56

3.75

3.47

U

2.17

2.16

2.16

2.46

2.23 ± 0.27

0.91

0.96

0.99

0.95

1.11

0.84

V

159

137

196

129

139.0 ± 21.6

51.0

65.9

61.4

75.5

105

63.8

Y

13.8

16.18

18.2

15.5

13.50 ± 3.43

7.89

9.84

8.39

11.5

10.7

10.6

Zn

61.8

65.5

81.4

55.7

62.2 ± 9.1

31

42.6

37.5

51.5

52.7

40.7

Zr

158

141

160

120

141.0 ± 21.8

92.0

111

112

89.0

174

107

Th/U

3.98

3.17

3.26

3.09

3.01 ± 0.73

3.55

2.7

3.43

3.76

3.37

4.12

Rb/Sr

0.06

0.1

0.09

0.09

0.09 ± 0.01

0.21

0.2

0.17

0.14

0.17

0.22

Ba/Sr

1.15

1.16

1.16

1.09

1.17 ± 0.07

1.99

1.59

1.76

1.47

1.75

1.87

Beach

Sample

PAL7

PAL8

PAL9

PAL10

PAL11

PAL13

PAL15

PAL17

PAL20

Mean ± 1 s (n = 15)

Ba

358

402

495

410

449

373

374

384

423

414.0 ± 45.1

Co

12.1

12.7

9.3

7.26

11.3

12.0

9.57

10.0

9.39

10.20 ± 1.63

Cr

195

160

158

135

161

197

108

161

159

154.0 ± 25.2

Cs

0.98

1.13

1.73

1.46

1.49

1.12

1.17

1.05

1.31

1.37 ± 0.23

Cu

8.15

7.69

9.93

8.64

9.66

9.81

7.71

7.5

7.79

8.62 ± 1.14

Hf

2.16

3.26

3.07

2.13

2.52

4.09

1.99

1.93

2.71

2.75 ± 0.69

Mo

2.27

2.06

1.86

1.76

2.21

1.95

1.36

2.17

2.18

1.89 ± 0.29

Nb

7.38

8.63

9.82

7.43

8.11

10.34

6.31

6.16

7.88

8.27 ± 1.57

Ni

13.02

11.7

11.2

10.5

12.2

12.4

11.5

11.6

11.3

11.80 ± 0.89

Pb

5.33

7.48

9.56

6.76

7.31

5.78

6.81

6.51

6.19

6.63 ± 1.00

Rb

33.9

38.7

51.4

41.9

44.1

36.4

37.3

37.3

43.2

42.20 ± 5.36

Sc

14.9

10.7

7.94

7.26

9.17

11.37

8.97

8.36

7.76

8.85 ± 2.67

Sr

189

206

277

211

274

193

259

207

216

234 ± 33

Ta

0.44

0.42

0.61

0.56

0.52

0.6

0.39

0.38

0.49

0.50 ± 0.08

Th

2.29

2.89

3.81

3.36

3.46

2.76

2.68

2.44

2.83

3.10 ± 0.49

U

0.66

0.85

1.1

1.06

1.09

0.85

0.93

0.8

0.84

0.93 ± 0.13

V

83.8

67.9

77.9

71.7

70.8

108

62.8

60.9

67.8

73.0 ± 15.7

Y

11.2

12.5

9.79

10.7

12.5

10.1

13.7

11.35

9.96

10.70 ± 1.52

Zn

39.7

38.5

41.8

51.5

52.3

45.4

39.8

39.2

37.2

42.70 ± 6.53

Zr

87

92

128

101

104

178

83.9

80.2

113

110.0 ± 29.8

Th/U

3.47

3.42

3.46

3.17

3.17

3.25

2.88

3.06

3.37

3.34 ± 0.34

Rb/Sr

0.18

0.19

0.19

0.2

0.16

0.19

0.14

0.18

0.2

0.18 ± 0.02

Ba/Sr

1.89

1.95

1.79

1.95

1.64

1.93

1.45

1.86

1.95

1.79 ± 0.18