Magnesium in subaqueous speleothems as a potential palaeotemperature proxy

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dc.contributor.authorDrysdale, RNen_AU
dc.contributor.authorCouchoud, Ien_AU
dc.contributor.authorZanchetta, Gen_AU
dc.contributor.authorIsola, Ien_AU
dc.contributor.authorRegattieri, Een_AU
dc.contributor.authorHellstrom, JCen_AU
dc.contributor.authorGovin, Aen_AU
dc.contributor.authorTzedakis, PCen_AU
dc.contributor.authorIreland, Ten_AU
dc.contributor.authorCorrick, Een_AU
dc.contributor.authorGrieg, Aen_AU
dc.contributor.authorWong, HKYen_AU
dc.contributor.authorPiccini, Len_AU
dc.contributor.authorHolden, PJen_AU
dc.contributor.authorWoodhead, JDen_AU
dc.date.accessioned2022-09-02T03:36:58Zen_AU
dc.date.available2022-09-02T03:36:58Zen_AU
dc.date.issued2020-10-06en_AU
dc.date.statistics2022-08-30en_AU
dc.descriptionOpen Access. This article is licensed under a Creative Commons Attribution 4.0 International License.en_AU
dc.description.abstractFew 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. © 2020 The Author(s)en_AU
dc.description.sponsorshipThis study was funded by Australian Research Council Discovery Project grants DP0773700 (to R.D., J.H. and G.Z.), DP110102185 (to R.D., J.W., J.H. and G.Z.) and DP160102969 (to R.D., J.W., G.Z., E.R. and P.T.). I.C. was the beneficiary of a research associate position funded under Australian Research Council Discovery Project DP0773700.en_AU
dc.identifier.articlenumber5057en_AU
dc.identifier.citationDrysdale, R., Couchoud, I., Zanchetta, G., Isola, I., Regattieri, E., Hellstrom, J., Govin, A., Tzedakis, P. C., Ireland, T., Corrick, E., Grieg, A., Wong, H., Piccini, L., Holden, P. J. & Woodhead, J. (2020). Magnesium in subaqueous speleothems as a potential palaeotemperature proxy. Nature communications, 11(1), 1-11. doi:10.1038/s41467-020-18083-7en_AU
dc.identifier.issn2041-1723en_AU
dc.identifier.journaltitleNature communicationsen_AU
dc.identifier.pagination1-11en_AU
dc.identifier.urihttps://doi.org/10.1038/s41467-020-18083-7en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13716en_AU
dc.identifier.volume11en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectMagnesiumen_AU
dc.subjectPaleoclimatologyen_AU
dc.subjectGeochemistryen_AU
dc.subjectOceanographyen_AU
dc.subjectCalcium carbonatesen_AU
dc.subjectCarbon 13en_AU
dc.subjectRainen_AU
dc.subjectStable isotopesen_AU
dc.subjectAmbient temperatureen_AU
dc.titleMagnesium in subaqueous speleothems as a potential palaeotemperature proxyen_AU
dc.typeJournal Articleen_AU
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