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Table T20. Concentration of hydrocarbon gases in headspace samples and void gases taken from sediment cores, Hole C0020A.

Core, section,
interval (cm) 		Depth
CSF-B (m) 		Concentration in headspace samples (ppmv) C1/C2 Concentration in interstitial water (µM)
Methane Ethane Propane iso-Butane n-Butane Methane Ethane Propane iso-Butane n-Butane
337-C0020A-
1R-1, 123–127 1277.75 845 1.28 BD 0.82 BD 661 473 0.71 BD 0.46 BD
2R-1, 126–140 1287.38 1,050 119 2.86 4.86 5.40 8.89 1,730 195 4.69 7.97 8.86
3R-2, 71–75 1371.97 1,980 2.38 BD 3.22 0.61 830 1,500 1.80 BD 2.44 0.46
4R-2, 99–103 1377.43 2,290 2.36 BD 2.46 BD 969 1,340 1.38 BD 1.44 BD
5R-2, 39–43 1491.82 13,400 8.12 BD 2.07 BD 1,650 2,960 1.79 BD 0.46 BD
6R-1, 136.5–140.5 1496.39 18,500 11.0 BD 0.88 BD 1,680 5,680 3.38 BD 0.27 BD
8L-3, 79.5–80 1605.96 1,940 4.80 BD BD BD 404 970 2.40 BD BD BD
8L-5, 19.5–20 1607.36 2,830 7.25 BD 0.92 BD 391 1,570 4.01 BD 0.51 BD
8L-9, 16–17 1611.34 5,580 21.3 0.34 1.30 0.32 262 2,550 9.74 0.15 0.60 0.14
9R-1, 139–143 1626.91 621 3.57 BD 0.40 BD 174 326 1.87 BD 0.21 BD
10R-1, 137–141 1630.89 2,150 15.4 0.42 1.52 0.62 140 1,410 10.1 0.28 1.00 0.41
11R-1, 134–138 1738.86 2,670 3.46 BD 0.72 BD 771 1,290 1.68 BD 0.35 BD
11R-4, 142–146 1742.48 3,010 9.07 BD 1.23 BD 332 2,600 7.83 BD 1.06 BD
12R-1, 139.5–143.5 1748.42 12,500 19.0 BD 0.62 BD 658 2,890 4.40 BD 0.14 BD
12R-7, 0–4 1754.56 2,370 8.03 BD 0.90 BD 295 1,320 4.45 BD 0.50 BD
13R-1, 140–144 1757.92 1,720 5.35 BD 0.99 BD 322 1,370 4.25 BD 0.79 BD
13R-7, 137–141 1764.98 1,410 5.63 0.33 1.13 BD 250 919 3.67 0.22 0.74 BD
14R-1, 137–141 1821.39 2,190 6.94 BD 1.10 BD 316 2,940 9.29 BD 1.47 BD
14R-5, 23–27 1824.09 2,760 11.0 0.65 0.70 BD 251 953 3.79 0.22 0.24 BD
14R-5, 91.5–95.5 1825.79 1,590 1.94 BD BD BD 820 771 0.94 BD BD BD
15R-1, 135.5–139.5 1920.38 158,000 97.1 2.18 1.77 0.87 1,630 271,000 167 3.75 3.04 1.50
15R-6, 136–140 1925.44 4,570 13.0 0.65 0.39 BD 353 3,010 8.52 0.43 0.25 BD
16R-1, 97–101 1929.49 712 1.63 BD 1.13 BD 437 607 1.39 BD 0.96 BD
16R-2, 73–77 1930.26 572 11.4 0.53 2.53 1.65 50.3 211 4.20 0.20 0.93 0.61
16R-3, 97–101 1931.27 1,260 5.59 BD 4.37 1.56 225 970 4.32 BD 3.38 1.20
16R-4, 98–102 1932.29 1,560 1.86 BD 1.12 BD 840 644 0.77 BD 0.46 BD
17R-1, 137–141 1937.39 2,260 2.75 BD 0.36 BD 824 1,220 1.49 BD 0.20 BD
17R-4, 137–141 1940.09 1,130 13.0 0.58 0.65 0.60 86.4 397 4.59 0.20 0.23 0.21
17R-6, 62–66 1941.51 262 0.30 BD BD BD 880 257 0.29 BD BD BD
17R-8, 116.5–120.5 1944.12 440 3.53 BD 0.39 0.45 125 184 1.48 BD 0.16 0.19
18R-1, 111–115 1946.63 219,000 198 5.53 1.59 0.48 1,100 84,200 76.4 2.13 0.61 0.18
19R-1, 137–141 1951.39 24,600 66.8 2.65 1.49 0.34 368 30,800 83.8 3.33 1.86 0.43
19R-3, 137–141 1953.56 823 0.81 BD 0.42 BD 1,010 290 0.29 BD 0.15 BD
19R-4, 86–90 1954.46 1,030 2.81 0.27 1.48 0.26 366 449 1.23 0.12 0.64 0.12
19R-7, 137–141 1958.48 1,190 26.1 2.04 0.88 0.27 45.4 1,690 37.1 2.90 1.25 0.38
20R-2, 62–66 1961.55 5,270 7.35 0.38 0.41 BD 717 1,680 2.34 0.12 0.13 BD
20R-6, 47–51 1965.67 2,810 1.60 BD BD BD 1,760 2,000 1.14 BD BD BD
21R-1, 138–142 1970.40 3,650 9.98 0.70 1.37 0.39 366 1,830 5.02 0.35 0.69 0.19
22R-4, 0–4 1977.21 1,340 1.42 BD 0.32 BD 948 708 0.75 BD 0.17 BD
23R-1, 92–96 1982.44 18,600 102 4.42 1.34 0.59 183 12,100 66.0 2.87 0.87 0.39
23R-3, 136–140 1985.24 3,230 19.0 1.13 1.05 BD 170 1,680 9.88 0.59 0.55 BD
23R-4, 96.5–100.5 1986.24 19,800 119 5.92 2.55 1.37 167 7,870 47.2 2.35 1.01 0.54
23R-5, 101–105 1987.29 3,210 24.3 1.64 2.45 0.90 132 2,120 16.0 1.08 1.62 0.60
23R-8, 0–4 1989.50 817 8.27 3.06 3.21 3.28 98.8 551 5.58 2.06 2.16 2.21
24R-1, 97–101 1991.99 339 0.62 BD 2.54 BD 546 115 0.21 BD 0.86 BD
24R-3, 71.5–75.5 1993.95 15,000 61.7 2.83 1.51 0.28 244 3,700 15.2 0.69 0.37 0.07
25R-1, 137–141 1996.39 1,040 16.9 1.59 2.45 1.61 61.3 1,110 18.1 1.70 2.62 1.72
25R-2, 137–141 1997.80 301,000 460 11.1 3.63 1.22 654 194,000 297 7.14 2.34 0.79
25R-3, 137–141 1999.21 1,640 18.5 1.20 1.11 0.47 88.5 1,440 16.2 1.05 0.97 0.41
25R-5, 136.5–140.5 2001.38 198,000 348 8.32 2.81 0.92 570 120,000 210 5.03 1.70 0.55
26R-2, 0–4 2111.41 14,900 50.4 11.9 3.68 4.87 296 10,900 36.7 8.65 2.68 3.55
26R-4, 136–140 2114.90 34,300 129 27.2 8.06 10.8 266 12,200 45.6 9.63 2.85 3.82
26R-7, 0–4 2117.11 8,070 46.5 12.1 4.95 6.51 174 6,040 34.8 9.06 3.70 4.87
27R-2, 0–4 2201.02 7,100 35.0 3.39 1.77 1.41 203 13,200 65.3 6.32 3.30 2.64
27R-3, 140–144 2203.22 12,400 60.7 5.90 2.76 3.04 205 11,700 57.1 5.55 2.60 2.86
28R-2, 137–141 2302.80 1,640 11.8 0.54 0.35 BD 139 1,290 9.33 0.43 0.28 BD
28R-5, 137–141 2306.38 2,190 39.7 1.93 BD BD 55.1 1,690 30.7 1.49 BD BD
29R-1, 136.5–140.5 2401.39 15.3 0.86 BD 0.48 BD 17.9 6.23 0.35 BD 0.19 BD
29R-3, 134–137 2403.52 2,330 12.9 0.47 0.85 BD 181 2,250 12.5 0.46 0.82 BD
29R-7, 136.5–140.5 2408.14 2,660 18.0 1.03 1.45 BD 148 851 5.75 0.33 0.47 BD
30R-3, 0–4 2448.70 73,400 810 24.1 0.83 1.03 90.7 100,000 1,100 32.8 1.13 1.40
30R-4, 0–4 2449.72 2,020 26.0 1.24 0.62 BD 77.6 1,870 24.1 1.15 0.58 BD
32R-1, 141–145 2457.93 4,670 19.3 0.74 0.52 BD 242 3,550 14.7 0.57 0.39 BD
32R-6, 67–71 2463.63 7,240 108 8.26 1.29 0.98 66.8 4,060 60.8 4.63 0.72 0.55
32R-10, 0–10 2466.53 548 6.66 1.03 7.69 5.03 82.3 326 3.97 0.61 4.58 3.00
Concentration in void gas samples (ppmv):
22R-3 59–59 1976.41 751,000 2,330 10.3 4.20 2.70 322          
22R-4 17–17 1977.36 577,000 1,560 4.60 4.00 3.80 371          
22R-5 32–32 1977.96 832,000 2,470 6.20 5.80 1.50 337          
22R-5 77–77 1978.41 840,000 2,570 6.30 5.80 2.00 326          

BD = below detection.

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