Geochemical methods in studies of recent and past environmental changes

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dc.contributor.authorChagué-Goff, Cen_AU
dc.contributor.authorWong, HKYen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorCohen, DDen_AU
dc.contributor.authorCope, Jen_AU
dc.date.accessioned2015-11-11T00:54:39Zen_AU
dc.date.available2015-11-11T00:54:39Zen_AU
dc.date.issued2013-11-17en_AU
dc.date.statistics2015-11-05en_AU
dc.description.abstractA multi‐proxy approach is advocated in studies of recent and past environmental changes, as the use of too few diagnostic criteria often leads to misinterpretations. Geochemistry is a powerful tool which, when combined with other proxies, can provide information on short‐ and long‐term changes preserved in the sedimentary record. Geochemical methods used in the studies presented here include ion chromatography, ICPAES, ICP‐MS, portable‐XRF and X‐ray core scanning. While IC, ICP‐AES and ICP‐MS are well established techniques, P‐XRF and X‐ray core scanning have only recently been used in geosciences, particularly in Australasia. The latter, coupled with magnetic susceptibility, produces a continuous record along the length of a core with high resolution fingerprinting of environmental changes, albeit with qualitative data. Portable‐XRF is a rapid non‐destructive method, but results are semi‐quantitative. Here we discuss the application of these two methods in recent studies.Long‐ and short‐term environmental changes in Moawhitu Wetland, d’Urville Island, New Zealand, were reconstructed using a suite of multi‐proxy analyses. It was high resolution X‐ray core scanning though that provided the geochemical evidence for tsunami inundation into the wetland, beyond the extent of any sand deposit. ICP‐AES and ICP‐MS analyses of selected samples were also used to quantify and corroborate the results of the X‐ray core scanning. saltwater is more commonly used in archaeological studies, although it has recently been used to map the inundation limit following the 2011 Tohoku‐oki tsunami, and to assess the longevity of marine chemical markers in different sediment types. Concurrent analyses of waterleachable ions by IC and ICP‐AES were also used to corroborate the results of p‐XRF analysis, confirming the occurrence of saltwater indicators in the sediment.en_AU
dc.identifier.citationChagué-Goff, C., Wong, H. K. Y., Gadd, P., Cohen, D., & Cope, J. (2013). Geochemical methods in studies of recent and past environmental changes. Paper presented at the 26th International Applied Geochemistry Symposium 17 – 21 November 2013 Rotorua, New Zealand.en_AU
dc.identifier.conferenceenddate21 November 2013en_AU
dc.identifier.conferencename26th International Applied Geochemistry Symposiumen_AU
dc.identifier.conferenceplaceRotorua, New Zealanden_AU
dc.identifier.conferencestartdate17 November 2013en_AU
dc.identifier.govdoc6265en_AU
dc.identifier.urihttps://www.appliedgeochemists.org/images/stories/IAGS_2013/IAGS%20Abstracts%202013.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6413en_AU
dc.language.isoenen_AU
dc.publisherThe Association of Applied Geochemistsen_AU
dc.subjectEnvironmental effectsen_AU
dc.subjectGeochemistryen_AU
dc.subjectSedimentsen_AU
dc.subjectChromatographyen_AU
dc.subjectAustraliaen_AU
dc.subjectWetlandsen_AU
dc.titleGeochemical methods in studies of recent and past environmental changesen_AU
dc.typeConference Abstracten_AU
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