Stable isotope analysis of the Cretaceous sulfur cycle
Earth and Planetary Science Letters, ISSN: 0012-821X, Vol: 285, Issue: 1, Page: 115-123
2009
- 41Citations
- 78Captures
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Article Description
We report the sulfur and oxygen isotope composition of sulfate (δ 34 S SO4 and δ 18 O SO4, 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 δ 34 S SO4 of marine barite tracks previously reported sulfur isotope data from the tropical Pacific. The δ 18 O SO4 of marine barite exhibits more rapid and larger isotopic excursions than the δ 34 S SO4 of marine barite; these excursions temporally coincide with Ocean Anoxic Events (OAEs). Neither the δ 34 S SO4 nor the δ 18 O SO4 measured in marine barite resembles the δ 34 S SO4 or the δ 18 O SO4 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 δ 18 O SO4 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 δ 34 S SO4 and δ 18 O SO4 to different perturbations in the marine biogeochemical sulfur cycle. We conclude that the δ 34 S SO4 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 δ 18 O SO4 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.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0012821X09003331; http://dx.doi.org/10.1016/j.epsl.2009.06.002; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=67650716334&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0012821X09003331; https://api.elsevier.com/content/article/PII:S0012821X09003331?httpAccept=text/xml; https://api.elsevier.com/content/article/PII:S0012821X09003331?httpAccept=text/plain; https://dx.doi.org/10.1016/j.epsl.2009.06.002
Elsevier BV
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