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Table T33. n-Alkane data obtained from core samples, Hole C0020A.

Core, section,
interval (cm)
Depth CSF-B (m) Lithology C17 to C34 n-alkanes
(µg/g sed)
CPI Pr/Ph C18/Ph
Top Bottom
337-C0020A-
2R-2, 93.5–94 1288.3 1288.3 Coal clast 1.8 16 2.6
15R-2, 0–17 1920.4 1920.6 Coal 1.8 11 3.2 3.5
18R-1, 105–115 1946.6 1946.7 Coal 2.0 10 2.5 3.5
24R-3, 55–65 1993.8 1993.9 Coal 2.1 12 5.8 2.0
25R-3, 120–141 1999 1999.2 Coal 0.4 10 0.6 0.1
25R-4, 0–15 1999.2 1999.4 Coal 13.4 7 1.7 3.5
2R-4, 4–5.5 1289.6 1289.7 Sandstone (rippled) 0.7 14 0.5 1.3
14R-2, 105–120 1822.5 1822.6 Siltstone 1.0 10 0.8 0.2
15R-5, 0–21 1923.6 1923.8 Siltstone 0.7 17 3.3 0.9
19R-1, 115–141 1951.2 1951.4 Siltstone 0.7 10 2.7 0.7
28R-3, 0–24 2302.8 2303.1 Siltstone 1.2 10 0.4 0.1
3R-3, 60–77 1372.6 1372.8 Mudstone 0.4 12 0.5 0.4
7R-1, 53–65 1599.5 1599.7 Mudstone 0.2 11 2.2 0.8
9R-4, 0–20 1628.4 1628.6 Mudstone 0.4 10 0.0 0.1
10R-2, 53–70 1631.4 1631.6 Mudstone 0.0 6 1.0 1.9
11R-5, 58–75 1743.1 1743.3 Mudstone 0.4 4 1.0 1.3
12R-7, 15–30 1754.7 1754.8 Mudstone 0.1 4 0.3 0.9
23R-8, 0–15 1989.5 1989.6 Mudstone 0.1 10 1.3 4.9
26R-2, 0–9 2111.4 2111.5 Shale 1.4 11 0.3 0.1

Carbon preference index (CPI), pristane/phytane ratio, and C18/phytane ratio are discussed in the text. CPI = 2 × ([C25 + C27 + C29 + C31 + C33]/[C24 + C26 + C28 + C30 +C32]) + ([C25 + C27 + C29 + C31 + C33]/[C26 + C28 + C30 + C32 +C34]); Pr/Ph = ratio of pristane to phytane measured on m/z 85 ion chromatogram; C18/Ph = ratio of C18 n-alkane to phytane measured on m/z 85 ion chromatogram.

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