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Earth, Planets and Space

Table 1 List of water samples and their chemical and isotopic compositions

From: Groundwater, possibly originated from subducted sediments, in Joban and Hamadori areas, southern Tohoku, Japan

Area

Sampling number

Depth (m)

Sampling date

Temperature (°C)

Chlorine (mM)

Bromine (μM)

Iodine (μM)

129I/I ratio (×10-15)

I age (Ma)

36Cl/Cl ratio (×10-15)

3H (TU)a

δD (‰)

δ18O (‰)

A

1

1,600

10 December 2003

31.6

374

472

20

388 ± 25

31

6.1 ± 1.1

<0.53b

-28

-4.3

2

1,500

10 December 2003

41.1

285

355

69

218 ± 12

44

-

-

-32

-3.2

16 March 2010

38.5

270

380

-

-

-

15.7 ± 2.0

-

-33

-3.5

3

1,200

10 December 2003

40.4

335

575

49

255 ± 18

40

22.9 ± 2.4

<0.40b

-25

-3.2

B

4

-

3 July 2007

17.6

34.4

56.3

-

-

-

2.1 ± 0.8

<0.04c

-50

-7.6

20 November 2012

16.1

37.1

53.0

3.0

281 ± 25

38

-

-

-49

-7.7

5

1,500

3 July 2007

44.1

434

695

-

-

-

6.5 ± 1.4

<0.04c

-13

-3.2

20 November 2012

44.2

392

577

44

247 ± 23

41

-

-

-14

-3.4

6

1,500

3 July 2007

39.3

79.2

120

-

-

-

7.1 ± 1.2

0.12 ± 0.02c

-36

-6.0

20 November 2012

38.6

57.9

70.7

6.4

232 ± 36

42

-

-

-37

-6.5

C

7

-

3 July 2007

58.8

17.6

27.5

-

-

-

16.5 ± 4.9

1.74 ± 0.05c

-47

-7.3

28 April 2011

58.3

19.8

29.4

-

-

-

-

1.28 ± 0.04c

-47

-7.4

23 October 2012

57.9

18.0

25.6

3.1

5840 ± 132

-

-

-

-47

-7.5

8

-

18 May 2011

56.1

38.3

56.3

-

-

-

27.8 ± 2.7

0.63 ± 0.03c

-44

-6.9

22 February 2012

62.4

35.7

51.3

-

-

-

36.5 ± 3.1

0.6 ± 0.1d

-

-

23 October 2012

63.8

34.2

50.1

6.0

1790 ± 80

-

-

-

-45

-7.2

D

9

880

11 December 2003

35.7

203

319

57

257 ± 14

40

7.3 ± 1.1

<0.41b

-25

-3.5

10

1,100

11 December 2003

77.8

185

287

-

-

-

7.3 ± 1.2

<0.53b

-27

-3.8

19 December 2012

76.2

187

278

43

312 ± 13

36

-

-

-27

-3.8

1,100

11 December 2003

64.5

211

324

59

239 ± 31

42

8.5 ± 1.4

<0.53b

-24

-3.3

19 December 2012

67.3

220

336

49

199 ± 11

46

-

-

-25

-3.4

350

11 December 2003

38.5

41.4

66.3

-

-

-

20.3 ± 2.2

<0.34b

-44

-7.0

19 December 2012

36.9

44.7

70.4

7.8

303 ± 15

36

-

-

-45

-7.1

E

11

River

19 May 2008

11.6

0.17

-

-

-

-

58.6 ± 4.3

-

-

-

12

River

19 May 2008

13.8

0.12

-

-

-

-

116.0 ± 7.4

-

-

-

Seawatere

   

550

840

0.44

      

Meteoric waterf

   

0.28

0.48

0.05

      
  1. a3H concentrations in groundwater samples were measured using liquid scintillation analyzer (bPackard, 3100TR, cPerkinElmer 1220 Quantulus (Morgenstern and Taylor2009), dLSC-LB5); eelemental concentration data for seawater were taken from Geochemical Earth Reference Model (2014); felemental concentration data for meteoric water were taken from Tagami and Uchida (2006). Sampling localities for the second column are shown in Figure 1a. The third to fifth columns give depths from which hot groundwater was pumped out, date of sampling, and water temperature at the time of sampling.
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