Journal
SCIENCE
Volume 365, Issue 6452, Pages 469-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaw9247
Keywords
-
Categories
Funding
- European Research Council [755053]
- de Botton Center for Marine Sciences at the Weizmann Institute of Science
- NSERC
- NSF ELT program through the Science Mission Directorate [NNA15BB03A]
- Packard Foundation
- Russian Science Foundation [17-77-10042]
- Russian Foundation for Basic Research [18-35-00022]
- Russian Science Foundation [17-77-10042] Funding Source: Russian Science Foundation
- European Research Council (ERC) [755053] Funding Source: European Research Council (ERC)
Ask authors/readers for more resources
The oxygen isotope composition (delta O-18) of marine sedimentary rocks has increased by 10 to 15 per mil since Archean time. Interpretation of this trend is hindered by the dual control of temperature and fluid delta O-18 on the rocks' isotopic composition. A new delta O-18 record in marine iron oxides covering the past similar to 2000 million years shows a similar secular rise. Iron oxide precipitation experiments reveal a weakly temperature-dependent iron oxide-water oxygen isotope fractionation, suggesting that increasing seawater delta O-18 over time was the primary cause of the long-term rise in delta O-18 values of marine precipitates. The O-18 enrichment may have been driven by an increase in terrestrial sediment cover, a change in the proportion of high-and low-temperature crustal alteration, or a combination of these and other factors.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available