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Seawater Strontium Isotopic Variations from 2.5 Million Years Ago to the Present
Abstract
Measurements of marine carbonate samples indicate that during the past 2.5 million years the 87 Sr/ 86 Sr ratio of seawater has increased by 14 × 10 -5 . The high average rate of increase of 87 Sr/ 86 Sr indicates that continental weathering rates were exceptionally high. Nonuniformity in the rate of increase suggests that weathering rates fluctuated by as much as ±30 percent of present-day values. Some of the observed shifts in weathering rates are contemporaneous with climatic changes inferred from records of oxygen isotopes and carbonate preservation in deep sea sediments.
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Citations
Cited by
Tectonic forcing of late cenozoic climate.
Raymo, M. E., & Ruddiman, W. F. (1992) · Nature · doi:10.1038/359117a0 · Cited by 2,341
Recent trends in strontium isotope stratigraphy
McArthur, J. M. (1994) · Terra Nova · doi:10.1111/j.1365-3121.1994.tb00507.x · Cited by 408
The marine187Os/186Os record of the past 80 million years
Peucker-Ehrenbrink, B., Ravizza, G., & Hofmann, A. W. (1995) · Earth and Planetary Science Letters · doi:10.1016/0012-821x(95)00003-u · Cited by 194
Modeling speleothem δ13C variability in a central Sierra Nevada cave using 14C and 87Sr/86Sr
Oster, J. L., Montañez, I. P., Guilderson, T. P., Sharp, W. D., & Banner, J. L. (2010) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2010.06.030 · Cited by 69
Metadata
- Authors
- Capo, R. C., & DePaolo, D. J.
- Venue
- Science
- Published
- 1990-07-06
- Volume
- 249
- Issue
- 4964
- Pages
- 51-55
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2039991526
- Cited by
- 173
- References
- 0
- FWCI
- 15.33
- Type
- journal article
- Language
- en
- Open access
- closed
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- Capo, R. C., & DePaolo, D. J. (1990). Seawater Strontium Isotopic Variations from 2.5 Million Years Ago to the Present. Science. https://doi.org/10.1126/science.249.4964.51
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