Fast high-resolution synchrotron micro-XRF mapping of annually laminated stalagmites

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dc.contributor.authorBorsato, Aen_AU
dc.contributor.authorFrisia, Sen_AU
dc.contributor.authorHellstrom, JCen_AU
dc.contributor.authorTreble, PCen_AU
dc.contributor.authorJohnson, Ken_AU
dc.contributor.authorHoward, DLen_AU
dc.contributor.authorGreig, Aen_AU
dc.date.accessioned2024-02-21T03:56:20Zen_AU
dc.date.available2024-02-21T03:56:20Zen_AU
dc.date.issued2019-04-11en_AU
dc.date.statistics2023-03-23en_AU
dc.description.abstractAnnual lamination in trace elements content allows to improve speleothem chronology as well as to extract paleoclimate information about fluctuations of the seasonal signal through time. Given the relatively slow growth and textural heterogeneity intrinsic in most speleothems, only high-resolution mapping techniques provide a viable approach to resolve trace elements variability at annual to sub-annual scale. Synchrotron radiation X-ray fluorescence microscopy (SR-μXRF) is, to date, the ideal technique as it provides quantitative, non-destructive fast scanning of large samples at the necessary high spatial resolution (0.5 – 5 μm). Here we present SR-μXRF investigation of U/Th dated stalagmites from caves in different geographic and climate setting including semi-arid (Flinders Ranges, South Australia), temperate (Central Italy) and tropical humid (Cook Islands, Northern Laos) climates. SR-μXRF analyses were coupled with high-resolution petrographic observation and LA-ICP-MS elemental analyses in order to verify the XRF elemental quantification and to test the relationship between fabric and trace element incorporation. All the analysed stalagmites revealed faint to sharp annual lamination in Sr, and, occasionally, in other elements such as Br, Cu and Zn. In climate setting characterised by strong seasonal contrast stalagmites often exhibit fabric changes at annual to centennial scale that are reflected in the internal porosity as well as in the incorporation of trace elements. Fabric control and spatial heterogeneity is also evident in the intensity of the annual cycles and, in some cases, the amplitude of Sr cycles vary considerably from one line scan to the adjacent ones. This poses the question of the significance and reproducibility of trace element analyses in speleothems characterised by fabric heterogeneity. © Author(s) 2019. CC Attribution 4.0 license.en_AU
dc.identifier.citationBorsato, A., Frisia, S., Hellstrom, H., Treble, P., Johnson, K., Howard, D., & Greig, A. (2019). Fast high-resolution synchrotron micro-XRF mapping of annually laminated stalagmites. Paper presented to the EGU General Assembly 2019, Vienna, Austria, 7-12 April 2019. In Geophysical Research Abstracts, Vol. 21, EGU2019-6157, 2019. Retrieved from: https://meetingorganizer.copernicus.org/EGU2019/EGU2019-6157.pdfen_AU
dc.identifier.conferenceenddate2019-04-12en_AU
dc.identifier.conferencenameEGU General Assembly 2019en_AU
dc.identifier.conferenceplaceVienna, Austriaen_AU
dc.identifier.conferencestartdate2019-04-07en_AU
dc.identifier.otherEGU2019-6157en_AU
dc.identifier.urihttps://meetingorganizer.copernicus.org/EGU2019/EGU2019-6157.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15375en_AU
dc.language.isoenen_AU
dc.publisherCopernicus GmbHen_AU
dc.subjectSynchrotronsen_AU
dc.subjectCavesen_AU
dc.subjectIslandsen_AU
dc.subjectAustraliaen_AU
dc.subjectTrace amountsen_AU
dc.subjectElementsen_AU
dc.subjectSouth Australiaen_AU
dc.subjectItalyen_AU
dc.titleFast high-resolution synchrotron micro-XRF mapping of annually laminated stalagmitesen_AU
dc.typeConference Abstracten_AU
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