Table 3.

Table 3. Stable carbon and oxygen isotopic composition of Site 996 carbonate precipitates and sediments.

Core, section,
interval (cm) Depth
(mbsf)
Isotopic composition
( PDB)

Type ¹³C ¹⁸O

164-996A-

1H-1, 4-6
0.04

C
-41.37
3.87

1H-1, 21-23
0.21

C
-41.03
3.72

1H-1, 32-34
0.32

C
-44.18
3.84

1H-1, 52-54
0.52

C
-43.01
3.98

1H-1, 63-65
0.63

C
-45.20
3.92

1H-1, 72-74
0.72

C
-42.53
3.62

1H-1, 85-95
0.85

C
-40.43
3.43

1H-1, 85-95
0.85

S
-33.36
2.69

1H-2, 15-16
1.05

C
-48.18
3.91

1H-2, 39-41
1.29

C
-46.75
3.73

1H-2, 56-58
1.46

C
-41.04
3.82

1H-6, 33-38
3.62

S
-13.02
1.73

2H-CC, 14-16
9.13

C
-38.91
4.01

3X-1, 50-52
10.00

C
-36.18
4.44

3X-1, 61-71
10.11

S
-8.42
1.90

8H-2, 0-12
49.61

S
-0.98
0.47

9H-3, 87-102
61.55

S
-3.47
0.47

164-996B-

1H-1, 0-5
0.00

C
-41.25
3.98

1H-1, 0-5
0.00

C
-42.40
3.81

1H-1, 5-7
0.05

C
-43.59
3.96

1H-1, 35-37
0.35

C
-40.25
3.48

1H-1, 37-39
0.37

C
-43.92
3.70

1H-1, 85-87
0.85

C
-41.42
3.69

1H-3, 135-150
2.44

S
-13.88
1.78

164-996C-

1H-1, 51-53
0.51

C
-40.54
4.10

1H-1, 56-58
0.56

C
-38.11
4.05

1H-1, 63-65
0.63

C
-41.44
4.12

1H-1, 70-72
0.70

C
-35.48
4.03

1H-1, 108-114
1.08

C
-45.34
3.46

1H-1, 108-114
1.08

S
-22.60
2.04

1H-2, 67-77
1.81

C
-37.92
2.98

1H-2, 67-77
1.81

S
-23.73
2.03

1H-3, 29-31
2.20

C
-44.31
3.84

2H-CC, 0-2
2.40

C
-37.43
3.19

2H-CC, 3-5
2.43

C
-35.78
3.79

164-996D-

1H-CC, 0-20
0.00

S
-16.98
1.83

1H-CC, 20-40
0.20

C
-30.47
4.10

1H-CC, 20-40
0.20

S
-25.69
2.96

3X-CC, 9-11
13.09

C
-37.60
4.59

4H-6, 135-150
28.59

S
-12.90
0.63

5X-CC, 7-9
32.17

C
-40.90
4.28

5X-CC, 7-9
32.17

C
-45.45
4.48

5X-CC, 7-9
32.17

C
-42.05
4.35

5X-CC, 23-25
32.33

C
-41.25
4.33

6H-2, 52-67
42.99

S
-0.86
0.66

164-996E-

1H-3, 72-87
3.72

S
-0.35
0.41

2H-1, 137-144
5.45

S
-1.78
0.23

2H-1, 144-150
5.52

S
-1.40
0.16

2H-2, 135-150
6.95

S
-9.34
1.31

2H-4, 134-150
9.94

S
-5.32
0.67

3X-CC, 0-7
13.60

C
-40.40
4.30

3X-CC, 8-12
13.68

C
-33.91
4.34

3X-CC, 21-25
13.81

C
-33.28
4.05

4H-5, 135-150
29.05

S
-0.54
0.21

6X-6, 135-150
50.86

S
-2.36
0.77

6X-CC, 11-13
51.62

C
-16.61
3.13

Core, section, interval (cm)	Depth (mbsf)		Isotopic composition ( PDB)
	Type	¹³C	¹⁸O
164-996A-
1H-1, 4-6	0.04		C	-41.37	3.87
1H-1, 21-23	0.21		C	-41.03	3.72
1H-1, 32-34	0.32		C	-44.18	3.84
1H-1, 52-54	0.52		C	-43.01	3.98
1H-1, 63-65	0.63		C	-45.20	3.92
1H-1, 72-74	0.72		C	-42.53	3.62
1H-1, 85-95	0.85		C	-40.43	3.43
1H-1, 85-95	0.85		S	-33.36	2.69
1H-2, 15-16	1.05		C	-48.18	3.91
1H-2, 39-41	1.29		C	-46.75	3.73
1H-2, 56-58	1.46		C	-41.04	3.82
1H-6, 33-38	3.62		S	-13.02	1.73
2H-CC, 14-16	9.13		C	-38.91	4.01
3X-1, 50-52	10.00		C	-36.18	4.44
3X-1, 61-71	10.11		S	-8.42	1.90
8H-2, 0-12	49.61		S	-0.98	0.47
9H-3, 87-102	61.55		S	-3.47	0.47
164-996B-
1H-1, 0-5	0.00		C	-41.25	3.98
1H-1, 0-5	0.00		C	-42.40	3.81
1H-1, 5-7	0.05		C	-43.59	3.96
1H-1, 35-37	0.35		C	-40.25	3.48
1H-1, 37-39	0.37		C	-43.92	3.70
1H-1, 85-87	0.85		C	-41.42	3.69
1H-3, 135-150	2.44		S	-13.88	1.78
164-996C-
1H-1, 51-53	0.51		C	-40.54	4.10
1H-1, 56-58	0.56		C	-38.11	4.05
1H-1, 63-65	0.63		C	-41.44	4.12
1H-1, 70-72	0.70		C	-35.48	4.03
1H-1, 108-114	1.08		C	-45.34	3.46
1H-1, 108-114	1.08		S	-22.60	2.04
1H-2, 67-77	1.81		C	-37.92	2.98
1H-2, 67-77	1.81		S	-23.73	2.03
1H-3, 29-31	2.20		C	-44.31	3.84
2H-CC, 0-2	2.40		C	-37.43	3.19
2H-CC, 3-5	2.43		C	-35.78	3.79
164-996D-
1H-CC, 0-20	0.00		S	-16.98	1.83
1H-CC, 20-40	0.20		C	-30.47	4.10
1H-CC, 20-40	0.20		S	-25.69	2.96
3X-CC, 9-11	13.09		C	-37.60	4.59
4H-6, 135-150	28.59		S	-12.90	0.63
5X-CC, 7-9	32.17		C	-40.90	4.28
5X-CC, 7-9	32.17		C	-45.45	4.48
5X-CC, 7-9	32.17		C	-42.05	4.35
5X-CC, 23-25	32.33		C	-41.25	4.33
6H-2, 52-67	42.99		S	-0.86	0.66
164-996E-
1H-3, 72-87	3.72		S	-0.35	0.41
2H-1, 137-144	5.45		S	-1.78	0.23
2H-1, 144-150	5.52		S	-1.40	0.16
2H-2, 135-150	6.95		S	-9.34	1.31
2H-4, 134-150	9.94		S	-5.32	0.67
3X-CC, 0-7	13.60		C	-40.40	4.30
3X-CC, 8-12	13.68		C	-33.91	4.34
3X-CC, 21-25	13.81		C	-33.28	4.05
4H-5, 135-150	29.05		S	-0.54	0.21
6X-6, 135-150	50.86		S	-2.36	0.77
6X-CC, 11-13	51.62		C	-16.61	3.13

Note: C = carbonate nodule, S = sediment.