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Weller, Petra; Stein, Ruediger (2010): (Table 1) CPI17-23, hopanoic acid, and n-C35 + lycopane/n-C31 ratios as well as 17beta(H), 21beta(H) homohopane, long-chain alkanes, and alkenones concentrations in IODP Exp302. PANGAEA,

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During Integrated Ocean Drilling Program Expedition 302 (Arctic Coring Expedition (ACEX)) a more than 200 m thick sequence of Paleogene organic carbon (OC)-rich (black shale type) sediments was drilled. Here we present new biomarker data determined in ACEX sediment samples to decipher processes controlling OC accumulation and their paleoenvironmental significance during periods of Paleogene global warmth and proposed increased freshwater discharge in the early Cenozoic. Specific source-related biomarkers including n-alkanes, fatty acids, isoprenoids, carotenoids, hopanes/hopenes, hopanoic acids, aromatic terpenoids, and long-chain alkenones show a high variability of components, derived from marine and terrestrial origin. The distribution of hopanoic acid isomers is dominated by compounds with the biological 17beta(H), 21beta(H) configuration indicating a low level of maturity. On the basis of the biomarker data the terrestrial OC supply was significantly enriched during the late Paleocene and part of the earliest Eocene, whereas increased aquatic contributions and euxinic conditions of variable intensity were determined for the Paleocene-Eocene thermal maximum and Eocene thermal maximum 2 events as well as the middle Eocene time interval. Furthermore, samples from the middle Eocene are characterized by the occurrence of long-chain alkenones, high proportions of lycopane, and high ratios (>0.6) of (n-C35 + lycopane)/n-C31. The occurrence of C37-alkenenones, which were first determined toward the end of the Azolla freshwater event, indicates that the OC becomes more marine in origin during the middle Eocene. Preliminary UK'37- based sea surface temperature (SST) values display a longterm temperature decrease of about 15C during the time interval 49-44.5 Ma (25° to 10°C), coinciding with the global benthic d18O cooling trend after the early Eocene climatic optimum. At about 46 Ma, parallel with onset of ice-rafted debris, SST (interpreted as summer temperatures) decreased to values <15°C. For the late early
Miocene a SST of 11°-15°C was determined. Most of the middle Eocene ACEX sediments are characterized by a smooth short-chain n-alkane distribution, which may point to natural oil-type hydrocarbons from leakage of petroleum reservoirs or erosion of related source rocks and redeposition.
Related to:
Weller, Petra; Stein, Ruediger (2008): Paleogene biomarker records from the central Arctic Ocean (Integrated Ocean Drilling Program Expedition 302): Organic carbon sources, anoxia, and sea surface temperature. Paleoceanography, 23, PA1S17,
Latitude: 87.890000 * Longitude: 137.650000
Minimum DEPTH, sediment/rock: 196.380 m * Maximum DEPTH, sediment/rock: 404.160 m
302-CompSite * Latitude: 87.890000 * Longitude: 137.650000 * Elevation: -1251.0 m * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: Vidar Viking * Device: Composite Core (COMPCORE) * Comment: Virtual core composed of spliced cores from Holes M0002A, M0003A, M0004A and M0004C. Virtual position and water depth is calculated as the mean of all Exp302 sites.
-999.00 = is not analyzed because of analytical problems (values below detection limit)
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Sample code/labelSample labelWeller, Petra
3Carbon Preference Index of n-Alkanes (C17-C33)CPI-(17-23)Weller, PetraCalculated
4Homohopane, 17beta(H), 21beta(H) per unit mass total organic carbon17b(H)21b(H) Hopane/TOCµg/gWeller, PetraGas chromatography - Mass spectrometry (GC-MS)
5Hopanoic acid ratio, betabeta/betaalpha+alphabetabb/ba+ab Hopanoic Acid RatioWeller, PetraCalculated
6Long-chain n-alkanes, C27+C29+C31 per unit mass total organic carbonC27+C29+C31/TOCµg/gWeller, PetraGas chromatography - Mass spectrometry (GC-MS)
7n-Alkane, C35/C31 ratioC35/C31Weller, PetraCalculated
8Alkenone, C37:3+C37:2K37ng/gWeller, PetraGas chromatography - Mass spectrometry (GC-MS)
9CommentCommentWeller, Petra
394 data points

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