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Table 4 Bulk rock composition (wt%) of basalts and carbonates and their initial Sr-isotopic signature

From: Geochemical/hydrochemical evaluation of the geothermal potential of the Lamongan volcanic field (Eastern Java, Indonesia)

Sample

SiO2

TiO2

Al2O3

Fe2O3

MnO

Mg

CaO

Na2O

K2O

P25

Total

87Sr/86Sr

FD1

46.1

1.37

19.1

12.9

0.20

4.58

10.9

2.73

0.85

0.08

99.7

FD8

50.3

1.63

15.6

13.4

0.20

3.27

8.11

2.53

1.61

0.39

99.6

0.70463 (±2)

WP2

47.0

1.09

19.4

12.1

0.19

4.99

10.8

2.48

0.63

0.11

99.7

0.70447 (±3)

WP9

49.4

1.06

17.9

10.9

0.16

2.68

7.86

2.86

2.26

0.38

99.7

0.70447 (±2)

WP8

50.0

2.00

14.4

15.5

0.25

3.87

7.68

2.54

1.90

0.53

99.6

0.70445 (±2)

WP11

47.2

1.20

19.0

12.7

0.20

4.67

10.4

2.65

0.64

0.17

99.8

0.70430 (±1)

WP12

44.9

0.92

15.3

12.7

0.19

10.8

11.8

1.56

0.29

0.09

99.8

0.70449 (±1)

WP14

50.7

0.99

20.0

9.3

0.15

2.75

8.21

2.85

2.12

0.41

99.7

0.70428 (±2)

WP17

46.0

1.32

19.2

12.8

0.20

4.92

11.2

2.67

0.84

0.09

99.7

0.70464 (±3)

WP13

47.2

2.03

16.7

14.4

0.26

2.77

9.83

2.72

1.19

0.46

100.0

WP19

50.5

0.94

19.9

11.2

0.18

3.20

8.71

3.26

1.09

0.24

100.0

WP20

51.6

0.94

20.6

10.1

0.18

2.41

9.44

3.62

0.97

0.15

100.0

WP22

48.8

1.04

21.0

10.7

0.18

3.51

10.8

3.17

0.66

0.09

99.9

WP4aa

0.4

0.00

0.13

0.08

0.01

0.21

54.7

0.05

0.00

0.00

99.8

WP4ba

4.4

0.08

1.99

0.87

0.01

0.47

50.8

0.06

0.04

0.00

100.0

  1. aCarbonate rocks sampled outside the research area