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Turchyn, Alexandra V; Schrag, Daniel P; Coccioni, Rodolfo; Montanari, Alessandro (2009): Stable isotope analyses of Cretaceous sediment samples [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.785789, Supplement to: Turchyn, AV et al. (2009): Stable isotope analysis of the Cretaceous sulfur cycle. Earth and Planetary Science Letters, 285(1-2), 115-123, https://doi.org/10.1016/j.epsl.2009.06.002

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Abstract:
We report the sulfur and oxygen isotope composition of sulfate (d34SSO4 and d18OSO4, respectively) in coexisting barite and carbonate-associated sulfate (CAS), which we use to explore temporal variability in the marine sulfur cycle through the middle Cretaceous. The d34SSO4 of marine barite tracks previously reported sulfur isotope data from the tropical Pacific. The d18OSO4 of marine barite exhibits more rapid and larger isotopic excursions than the d34SSO4 of marine barite; these excursions temporally coincide with Ocean Anoxic Events (OAEs). Neither the d34SSO4 nor the d18OSO4 measured in marine barite resembles the d34SSO4 or the d18OSO4 measured in coexisting CAS. Culling our data set for elemental parameters suggestive of carbonate recrystallization (low [Sr] and high Mn/Sr) improves our record of d18OSO4 in CAS in the Cretaceous. This suggests that the CAS proxy can be impacted by carbonate recrystallization in some marine sediments. A box model is used to explore the response of the d34SSO4 and d18OSO4 to different perturbations in the marine biogeochemical sulfur cycle. We conclude that the d34SSO4 in the middle Cretaceous is likely responding to a change in the isotopic composition of pyrite being buried, coupled possibly with a change in riverine input. On the other hand, the d18OSO4 is likely responding to rapid changes in the reoxidation pathway of sulfide, which we suggest may be due to anoxic versus euxinic conditions during different OAEs.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 27.601355 * Median Longitude: 35.400068 * South-bound Latitude: -64.517000 * West-bound Longitude: 3.100150 * North-bound Latitude: 43.100000 * East-bound Longitude: -142.015650
Date/Time Start: 1973-08-29T00:00:00 * Date/Time End: 2001-11-23T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Turchyn, AV; Schrag, DP; Coccioni, R et al. (2009): (Appendix 1) Sulphur isotope ratios barite and carbonate associated sulphates from Cretaceous ODP and DSDP sediment samples. https://doi.org/10.1594/PANGAEA.785782
  2. Turchyn, AV; Schrag, DP; Coccioni, R et al. (2009): (Appendix 3) Oxygen isotopes of barite from Cretaceous samples from the Umbria-Marche Apennines. https://doi.org/10.1594/PANGAEA.785788
  3. Turchyn, AV; Schrag, DP; Coccioni, R et al. (2009): (Appendix 2) Oxygen isotopes of carbonate associated sulphate from Cretaceous samples from the Umbria-Marche Apennines. https://doi.org/10.1594/PANGAEA.785786
  4. Turchyn, AV; Schrag, DP; Coccioni, R et al. (2009): (Appendix 1) Sulphur isotope ratios barite and carbonate associated sulphates from Cretaceous samples from the Umbria-Marche Apennines. https://doi.org/10.1594/PANGAEA.785783