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  • Cited by 8
Publisher:
Cambridge University Press
Online publication date:
August 2021
Print publication year:
2021
Online ISBN:
9781108990752

Book description

Lithium isotopes are a relatively novel tracer of present and past silicate weathering processes. Given that silicate weathering is the primary long-term method by which CO2 is removed from the atmosphere, Li isotope research is going through an exciting phase. We show the weathering processes that fractionate dissolved and sedimentary Li isotope ratios, focusing on weathering intensity and clay formation. We then discuss the carbonate and silicate archive potential of past seawater δ7Li. These archives have been used to examine Li isotope changes across both short and long timescales. The former can demonstrate the rates at which the climate is stabilised from perturbations via weathering, a fundamental piece of the puzzle of the long-term carbon cycle.

References

Key Papers

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3.Pistiner, J. S., and Henderson, G. M. (2003). Lithium-isotope fractionation during continental weathering processes. Earth Planet. Sci. Lett. 214, 327339. First experimental examination of Li isotope behaviour during weathering.
4.Kisakürek, B., James, R. H., and Harris, N. B. W. (2005). Li and δ7Li in Himalayan rivers: Proxies for silicate weathering? Earth Planet. Sci. Lett. 237, 387401. First demonstration that Li isotopes track silicate weathering only.
5.Misra, S., and Froelich, P. N. (2012). Lithium isotope history of Cenozoic seawater: Changes in silicate weathering and reverse weathering. Science 335, 818823. Record of the seawater of the entire Cenozoic.
6.Pogge von Strandmann, P. A. E., Jenkyns, H. C., and Woodfine, R. G. (2013). Lithium isotope evidence for enhanced weathering during Oceanic Anoxic Event 2. Nature Geoscience 6, 668672. – First short-term record through a geological event.
7.Dellinger, M., Gaillardet, J., Bouchez, J., et al. (2015). Riverine Li isotope fractionation in the Amazon River basin controlled by the weathering regimes. Geochim. Cosmochim. Acta 164, 7193. – Paper that demonstrates the riverine Li isotope response to weathering intensity.
8.Pogge von Strandmann, P. A. E., and Henderson, G. M. (2015). The Li isotope response to mountain uplift. Geology 43, 6770. Demonstration of impact of supply vs. residence time on Li isotopes.
9.Dellinger, M., Hardisty, D. S., Planavsky, N. J., et al. (2020). The effects of diagenesis on lithium isotope ratios of shallow marine carbonates. Am. J. Sci. 320, 150184. Carbonate fractionation factors, and their use for palaeo-record reconstruction.
10.Hindshaw, R. S., Tosca, R., Gout, T. L., et al. (2019). Experimental constraints on Li isotope fractionation during clay formation. Geochim. Cosmochim. Acta 250, 219237 Fractionation during clay synthesis.

Other References

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