Table T16. Total carbon, inorganic carbon, carbonate, total organic carbon, and total nitrogen concentrations and carbon/nitrogen ratios, Site 1257.

Hole, core, section,
interval (cm)

Depth
(mbsf)
TC
(wt%)
IC
(wt%)
CaCO3
(wt%)
TOC
(wt%)
N
(wt%)
C/N
(atomic)
207-






Unit I (nannofossil ooze):



1257A-1H-1,42–43 0.42
1.47 12.2


Unit II (foraminifer- and silica-bearing nannofossil chalk):



1257A-1H-2, 48–49 1.98 10.00 9.90 82.5 0.10 0.02 5.8
1257A-2H-1, 45–46 3.05
9.05 75.4


1257A-2H-3, 45–46 6.05 8.75 8.76 73.0
0.09
1257A-2H-5, 45–46 9.05
7.04 58.6


1257A-3H-1, 60–61 12.70
7.78 64.8


1257A-3H-3, 58–59 15.68 8.57 8.54 71.1 0.03 0.03 1.3
1257A-3H-5, 60–61 18.70
7.96 66.3


1257A-4H-1, 90–91 22.50
8.58 71.5


1257A-4H-2, 17–18 23.27 9.72 9.71 80.9 0.01 0.02 0.6
1257A-4H-6, 80–81 29.70
7.18 59.8


1257A-5H-1, 35–36 31.45
7.81 65.1


1257A-5H-3, 35–36 34.45 7.36 7.25 60.4 0.11 0.03 4.8
1257A-5H-5, 35–36 37.45
6.69 55.7


1257B-1R-1, 76–78 40.76
7.50 62.5


1257A-6X-1, 19–20 40.79
8.04 67.0


1257B-1R-2, 35–36 41.85 8.73 8.60 71.6 0.13

1257B-1R-3, 74–75 43.74
9.12 76.0


1257A-6X-3, 19–20 43.79 9.02 9.00 75.0 0.02 0.03 0.8
1257B-2R-1, 30–31 45.10
8.71 72.5


1257A-7X-1, 79–80 45.69
9.33 77.7


1257B-2R-2, 27–28 46.57 8.71 8.70 72.4 0.01

1257A-6X-CC, 18–19 46.73
8.45 70.4


1257A-7X-2, 108–109 47.48
8.31 69.2


1257B-2R-3, 129–130 49.09
8.51 70.9


1257B-3R-2, 51–52 51.81 9.15 9.05 75.4 0.10

1257A-7X-5, 142–143 52.32 9.31 9.29 77.4 0.02 0.03 0.9
1257A-8X-1, 112–113 55.22
8.27 68.9


1257A-8X-3, 92–93 58.02 8.07 8.01 66.7 0.06 0.03 2.7
1257B-4R-1, 93–94 60.33
8.24 68.7


1257A-8X-5, 62–63 60.72
5.43 45.2


1257B-4R-3, 57–58 62.96
8.95 74.6


1257B-4R-4, 102–107 64.91 6.30 6.27 52.2 0.03

1257B-4R-5, 33–34 65.72
5.93 49.4


1257A-9X-4, 69–70 68.89 9.83 9.81 81.7 0.02 0.01 2.6
1257B-5R-1, 42–43 69.42
7.58 63.2


1257B-5R-1, 132–133 70.32 5.87 5.69 47.4 0.18

1257A-10X-2, 73–74 75.53
4.38 36.5


1257A-10X-4, 30–31 78.10 7.44 7.43 61.9 0.01 0.03 1.3
1257B-6R-1, 90–91 79.60 6.89 6.74 56.2 0.15

1257A-10X-6, 30–31 80.60
7.80 65.0


Unit III (foraminifer-bearing nannofossil chalk):



1257A-11X-1, 40–41 83.40
7.41 61.7


1257A-11X-CC, 27–28 85.01 5.17 5.14 42.8 0.03 0.03 1.4
1257B-7R-2, 80–81 90.60 7.10 7.01 58.4 0.09 0.04 2.5
1257C-2R-1, 32–32 91.92
2.83 23.6


1257C-2R-1, 103–103 92.63
7.32 61.0


1257A-12X-1, 40–41 93.00
7.33 61.1


1257A-12X-3, 40–41 96.00 7.10 7.06 58.8 0.04 0.02 2.0
1257B-8R-1, 60–61 98.50
7.52 62.7


1257B-8R-3, 60–61 101.47 6.11 6.00 50.0 0.11

1257A-13X-1, 75–76 102.95
5.93 49.4


1257C-3R-2, 95–96 103.65
3.02 25.1


1257B-8R-5, 60–61 104.47
5.79 48.2


1257A-13X-3, 75–76 105.95 6.50 6.49 54.1 0.01 0.03 0.3
1257C-3R-4, 95–96 106.65
5.14 42.8


1257B-9R-1, 64–65 108.24
5.85 48.7


1257A-13X-5, 68–69 108.88
3.17 26.4


1257C-3R-6, 95–96 109.65
5.65 47.1


1257B-9R-3, 64–65 111.26
6.09 50.7


1257A-14X-1, 74–75 112.54
5.57 46.4


1257B-9R-5, 64–65 114.26 5.53 5.43 45.2 0.10 0.01 14.0
1257A-14X-3, 69–70 115.49 5.57 5.49 45.7 0.08 0.05 1.8
1257B-9R-7, 49–50 117.11
4.68 39.0


1257B-10R-1, 40–41 117.60
4.49 37.4


1257A-14X-5, 69–70 118.49
4.59 38.2


1257B-10R-2, 37–38 119.07
3.37 28.1


1257B-10R-3, 42–43 120.62 4.48 4.25 35.4 0.23 0.02 11.4
1257A-15X-1, 70–71 122.20
5.51 45.9


1257B-10R-5, 40–41 123.60
5.41 45.1


1257A-15X-3, 68–69 125.18 5.40 5.35 44.6 0.05 0.10 0.6
1257B-10R-7, 40–41 126.60
4.61 38.4


1257B-11R-1, 59–60 127.39
5.07 42.2


1257A-15X-5, 70–71 128.20
6.80 56.6


1257B-11R-3, 60–61 130.40 3.37 3.27 27.3 0.10 0.02 7.2
1257C-6R-1, 69–69 130.79
5.00 41.6


1257A-16X-1, 120–121 132.30
6.63 55.2


1257B-11R-5, 59–60 133.39
4.82 40.2


1257C-6R-3, 69–69 133.79
4.71 39.2


1257A-16X-3, 120–121 135.30 3.49 3.40 28.3 0.09 0.04 2.3
1257A-16X-4, 14–15 135.74
4.23 35.2


1257B-11R-7, 49–50 135.79
4.26 35.5


1257C-6R-5, 69–69 136.79
4.35 36.3


1257C-6R-7, 55–55 139.65
4.62 38.5


1257A-17X-1, 60–63 141.30
8.79 73.2


1257A-17X-3, 42–43 144.08 7.23 7.20 60.0 0.03 0.03 1.2
1257A-17X-3, 98–99 144.64
6.99 58.2


1257C-7R-4, 145–147 144.95
9.97 83.1


1257A-17X-5, 48–50 147.14
6.49 54.1


1257A-18X-2, 41–42 152.21
7.93 66.1


1257B-14R-1, 29–30 155.79 8.05 7.93 66.1 0.12

1257A-18X-4, 126–127 156.02 4.96 4.92 41.0 0.04 0.02 2.9
1257A-18X-6, 123–124 158.99
5.90 49.1


1257A-19X-1, 24–25 159.94 5.61 5.62 46.8 0.00 0.01
1257A-19X-CC, 25–26 161.45 6.23 6.23 51.9 0.00 0.02
1257A-20X-1, 95–97 170.35 1.95 1.95 16.2 0.00 0.01
1257A-20X-2, 131–132 172.21 6.38 6.02 50.1 0.36 0.02 20.4
1257A-20X-3, 145–146 173.85 5.72 5.73 47.7 0.00 0.03
Unit IV (laminated calcareous claystone):



1257A-20X-5, 73–74 176.13 8.14 5.41 45.1 2.73 0.16 20.2
1257A-20X-6, 35–36 177.25 10.82 4.89 40.7 5.93 0.28 16.2
1257A-21X-1, 83–84 179.83 14.05 5.50 45.8 8.55 0.36 28.0
1257B-19R-1, 105–106 184.75 9.18 3.52 29.4 5.66 0.29 23.1
1257B-19R-2, 31–32 185.51 9.98 4.68 39.0 5.30 0.27 22.5
1257B-20R-1, 12–13 188.82 7.26 5.68 47.3 1.58 0.11 16.3
1257A-22X-1, 80–83 189.40 14.99 5.48 45.6 9.51 0.42 26.3
1257B-20R-1, 77–78 189.47 15.62 5.97 49.8 9.65 0.34 33.0
1257A-22X-2, 19–20 190.29 14.63 6.01 50.1 8.62 0.38 26.2
1257B-21R-1, 95–96 194.25 12.34 11.66 97.2 0.68 0.02 32.7
1257B-21R-2, 16–17 194.96 12.14 10.57 88.1 1.57 0.12 15.3
1257B-21R-2, 27–28 195.07 19.00 7.93 66.1 11.07 0.33 39.1
1257B-21R-2, 47–48 195.27 20.75 4.99 41.6 15.76 0.54 34.1
1257A-23X-1, 23–24 198.43 12.40 11.46 95.5 0.94 0.04 30.8
1257B-22R-1, 36–37 198.66 14.32 6.53 54.4 7.79 0.28 32.5
1257B-22R-1, 44–45 198.74 10.65 0.93 7.7 9.72 0.38 30.1
1257B-22R-1, 83–84 199.13 14.29 5.89 49.0 8.40 0.29 33.5
1257A-23X-3, 78–79 201.98 11.73 9.41 78.4 2.32 0.17 15.9
1257B-23R-1, 40–41 203.40 12.96 0.68 5.7 12.28 0.49 29.4
1257B-23R-1, 50–51 203.50 12.40 6.78 56.5 5.62 0.27 24.3
1257B-23R-2, 8–9 203.99 11.77 10.25 85.4 1.52 0.09 19.2
1257A-23X-5, 85–86 205.05 15.09 4.44 37.0 10.65 0.40 31.1
1257A-24X-1, 62–63 208.22 17.27 8.64 72.0 8.63 0.27 37.3
1257B-24R-1, 49–50 208.49 14.34 6.76 56.3 7.58 0.31 28.4
1257B-24R-2, 74–75 210.24 13.42 6.30 52.5 7.12 0.29 28.3
1257A-24X-3, 45–46 211.05 14.83 5.70 47.5 9.13 0.36 29.6
1257B-24R-4, 32–33 212.28 13.58 4.96 41.3 8.62 0.31 32.7
1257B-25R-1, 31–31 212.91 12.56 5.00 41.6 7.56 0.25 35.0
1257B-25R-1, 45–46 213.05 12.86 8.59 71.5 4.27 0.23 22.0
1257B-25R-1, 128–129 213.88 11.52 5.17 43.0 6.35 0.29 25.4
1257B-25R-2, 33–33 214.43 12.21 11.85 98.7 0.36

1257B-25R-2, 113–114 215.23 7.96 6.31 52.6 1.65 0.10 19.2
1257C-15R-1, 70–71 217.30 14.95 6.74 56.2 8.21 0.30 32.3
1257A-25X-1, 104–105 218.24 14.68 6.27 52.2 8.41 0.35 28.0
1257C-15R-3, 14–15 218.95 14.28 8.64 72.0 5.64 0.23 28.5
Unit V (silty calcareous siltstone):



1257B-26R-1, 125–126 218.85 3.82 3.35 27.9 0.47 0.07 8.0
1257B-26R-2, 32–33 219.42 3.44 3.06 25.5 0.38 0.05 8.2
1257B-27R-3, 72–73 226.02 3.88 3.51 29.3 0.37 0.05 8.7
1257A-26X-2, 71–72 229.01 4.37 3.98 33.2 0.39 0.05 9.6
1257A-26X-4, 67–68 231.97 3.84 3.31 27.6 0.53 0.06 11.2
1257A-26X-6, 73–74 235.03 3.90 3.41 28.4 0.49 0.07 8.2
1257A-27X-1, 72–73 237.22 4.48 4.26 35.5 0.22 0.04 6.3
1257A-27X-3, 71–72 240.21 4.87 4.17 34.7 0.70 0.09 9.1
1257A-27X-5, 72–73 243.22 3.56 2.88 24.0 0.68 0.05 16.0
1257A-28X-1, 63–64 246.83 4.64 3.93 32.7 0.71 0.11 7.5
1257A-28X-4, 60–61 251.30 1.88 1.09 9.1 0.79 0.11 8.4
1257A-29X-1, 70–71 256.50 5.46 5.03 41.9 0.43 0.05 9.8
1257A-29X-3, 71–72 259.51 6.03 5.39 44.9 0.64 0.04 19.1
1257A-29X-5, 71–72 262.51 4.67 4.01 33.4 0.66 0.10 7.8
1257A-30X-3, 32–33 268.72 5.54 4.83 40.2 0.71 0.06 14.8
1257A-31X-1, 65–66 275.75 5.78 5.02 41.8 0.76 0.11 8.1

Notes: TC = total carbon, IC = inorganic carbon, TOC = total organic carbon. Atomic C/N ratios are calculated from concentrations of organic carbon and total nitrogen.