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    Magnesium in subaqueous speleothems as a potential palaeotemperature proxy

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    Author
    Drysdale, R; Couchoud, I; Zanchetta, G; Isola, I; Regattieri, E; Hellstrom, J; Govin, A; Tzedakis, PC; Ireland, T; Corrick, E; ...
    Date
    2020-10-06
    Source Title
    Nature Communications
    Publisher
    NATURE RESEARCH
    University of Melbourne Author/s
    Drysdale, Russell; Woodhead, Jonathan
    Affiliation
    School of Geography
    School of Earth Sciences
    Metadata
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    Document Type
    Journal Article
    Citations
    Drysdale, R., Couchoud, I., Zanchetta, G., Isola, I., Regattieri, E., Hellstrom, J., Govin, A., Tzedakis, P. C., Ireland, T., Corrick, E., Greig, A., Wong, H., Piccini, L., Holden, P. & Woodhead, J. (2020). Magnesium in subaqueous speleothems as a potential palaeotemperature proxy. NATURE COMMUNICATIONS, 11 (1), https://doi.org/10.1038/s41467-020-18083-7.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/251663
    DOI
    10.1038/s41467-020-18083-7
    Abstract
    Few palaeoclimate archives beyond the polar regions preserve continuous and datable palaeotemperature proxy time series over multiple glacial-interglacial cycles. This hampers efforts to develop a more coherent picture of global patterns of past temperatures. Here we show that Mg concentrations in a subaqueous speleothem from an Italian cave track regional sea-surface temperatures over the last 350,000 years. The Mg shows higher values during warm climate intervals and converse patterns during cold climate stages. In contrast to previous studies, this implicates temperature, not rainfall, as the principal driver of Mg variability. The depositional setting of the speleothem gives rise to Mg partition coefficients that are more temperature dependent than other calcites, enabling the effect of temperature change on Mg partitioning to greatly exceed the effects of changes in source-water Mg/Ca. Subaqueous speleothems from similar deep-cave environments should be capable of providing palaeotemperature information over multiple glacial-interglacial cycles.

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