Journal
SCIENCE
Volume 327, Issue 5969, Pages 1114-1117Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1182252
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Funding
- National Environment Research Council [NER/T/S/2003/00048, NE/E001971/1, NE/C513242/1]
- Ocean Drilling Program (ODP)
- Integrated Ocean Drilling Program (IODP)
- NSF
- Japan's Ministry of Education, Culture, Sports, Science and Technology
- European Consortium for Ocean Drilling Research
- People's Republic of China, Ministry of Science and Technology
- Natural Environment Research Council [NE/E005640/1, NE/E001971/1, NER/T/S/2003/00048, NE/I006311/1, NE/E005616/1] Funding Source: researchfish
- NERC [NE/I006311/1, NE/E001971/1, NE/E005640/1, NE/E005616/1] Funding Source: UKRI
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Proxies for past seawater chemistry, such as Mg/Ca and Sr/Ca ratios, provide a record of the dynamic exchanges of elements between the solid Earth, the atmosphere, and the hydrosphere and the evolving influence of life. We estimated past oceanic Mg/Ca and Sr/Ca ratios from suites of 1.6- to 170-million-year-old calcium carbonate veins that had precipitated from seawater-derived fluids in ocean ridge flank basalts. Our data indicate that before the Neogene, oceanic Mg/Ca and Sr/Ca ratios were lower than in the modern ocean. Decreased ocean spreading since the Cretaceous and the resulting slow reduction in ocean crustal hydrothermal exchange throughout the early Tertiary may explain the recent rise in these ratios.
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