10.1594/PANGAEA.704907
Vetó, István
István
Vetó
Hertelendi, Ede
Ede
Hertelendi
Sajgó, Csanád
Csanád
Sajgó
Brukner-Wein, Alice
Alice
Brukner-Wein
Organic δ¹³C values, kerogen atomic C/N ratios and relative weights of some kerogen pyrolysis products of ODP Hole 112-682A (Table 1)
PANGAEA
1999
DEPTH, sediment/rock
Sample code/label
Epoch
δ13C
Carbon/Nitrogen ratio
n-octene
Meta- and paraxylene
Phenols
Drilling/drill rig
DSDP/ODP/IODP sample designation
Isotope ratio mass spectrometry
Element analyser, Fisons NA 1500 NCS
Leg112
Joides Resolution
Ocean Drilling Program (ODP)
1986-11-09T01:15:00/1986-11-14T13:30:00
en
Supplementary Dataset
10.1016/S0031-0182(98)00108-4
140 data points
text/tab-separated-values
Creative Commons Attribution 3.0 Unported
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.
Supplement to: Vetó, István; Hertelendi, Ede; Sajgó, Csanád; Brukner-Wein, Alice (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
-79.06217
-11.2665
South Pacific Ocean