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Vetó, István; Hertelendi, Ede; Sajgó, Csanád; Brukner-Wein, Alice (1999): Organic d13C values, kerogen atomic C/N ratios and relative weights of some kerogen pyrolysis products of ODP Hole 112-682A (Table 1). PANGAEA, https://doi.org/10.1594/PANGAEA.704907, Supplement to: Vetó, I et al. (1999): Upward increase of kerogen d13C in the Peru Margin Upper Oligocene: possible implications for the Cenozoic evolution of atmospheric CO2. Palaeogeography, Palaeoclimatology, Palaeoecology, 145(1-3), 33-42, https://doi.org/10.1016/S0031-0182(98)00108-4

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Abstract:
Carbon isotopic composition of predominantly marine kerogen in latest Oligocene mudstones of the Peru Margin ODP 682A Hole shows an about 3.5 per mil increase with decreasing age. Py-GC and elemental (C=N ratio) analysis of the kerogen plus sulphur isotopic study together with earlier knowledge on geological setting and organic geochemistry results in a better understanding of depositionary environment and allows to separation of the influence of concentration of water dissolved carbon dioxide (ce) on kerogen delta13C from that of other factors (bacterial degradation, sea surface temperature, DIC delta13C, productivity, and admixture of land plant OM). Based on this analysis, the major part of the kerogen shift is considered as a result of the latest Oligocene decrease of marine photosynthetic carbon isotopic fractionation in the Peru Margin photic zone, which in turn possibly reflects a simultaneous drop in atmospheric CO2 level. Uncertainties in the evaluation of the factors affecting the marine photosynthetic carbon isotopic fractionation and the extent of ocean-atmosphere disequilibrium do not permit calculation of the decrease of the atmospheric CO2.
Project(s):
Coverage:
Latitude: -11.266500 * Longitude: -79.062170
Date/Time Start: 1986-11-09T01:15:00 * Date/Time End: 1986-11-14T13:30:00
Minimum DEPTH, sediment/rock: 312.22 m * Maximum DEPTH, sediment/rock: 397.30 m
Event(s):
112-682A * Latitude: -11.266500 * Longitude: -79.062170 * Date/Time Start: 1986-11-09T01:15:00 * Date/Time End: 1986-11-14T13:30:00 * Elevation: -3801.0 m * Penetration: 436.7 m * Recovery: 127.04 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 48 cores; 436.7 m cored; 0 m drilled; 29.1 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Sample code/labelSample labelVetó, IstvánODP sample designation
3EpochEpochVetó, István
4delta 13Cd13Cper mil PDBVetó, IstvánIsotope ratio mass spectrometryof kerogen, per mil PDB
5Carbon/Nitrogen ratioC/NVetó, István
6n-octenen-octene%Vetó, IstvánElement analyser, Fisons NA 1500 NCS
7Meta- and paraxylene(m+p) xylene%Vetó, IstvánElement analyser, Fisons NA 1500 NCS
8PhenolPhenol%Vetó, IstvánElement analyser, Fisons NA 1500 NCS
Size:
140 data points

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