Stein et al.: Late Ouaternary Organic Carbon and Biomarker Records from the Laptev Sea
651
0.2
Phaeopigment
Absorbance
0.1
(410 nm + HCI)
0
Alkenone
(~glgTOC)
0.5
0
Short-Chain
600
Fatty Acid
(~glgTOC)
300
C17+C19
20
(~glg TOC)
10
0
C27+C29 +C31 600
(~glgTOC)
300
0
20
C/N
10
300
Hydrogen
200
Index
(mgHC/gTO C) 100
0
2
Total Organic
Carbon (%)
0
0
100
200
300
400
Depth (cmbsf)
Figure 8: Organic-geochemical bulk parameters and specific biomarkers in the sedimentary sequence of Core
2471: Total organic carbon contents (%). hydrogen index values (mgHC/gTOC) , total organic carbon/total
nitrogen (C/N) ratios, short-chain n-alkanes (C'7+C'9) (/-lg/gTOC), short-chain fatty acids (/-lg/gTOC),
alkenones (/-lg/gTOC), and phaeopigment absorbance values. Gray intervals indicate turbidites (Tl, T2, and T3).
A, B, and C mark stratigraphic/lithologic units discussed in the text.