Trace elements: from sources to cave drip water, south-eastern Australia

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dc.contributor.authorTadros, CVen_AU
dc.contributor.authorTreble, PCen_AU
dc.contributor.authorBaker, AAen_AU
dc.date.accessioned2020-06-10T04:42:43Zen_AU
dc.date.available2020-06-10T04:42:43Zen_AU
dc.date.issued2018-12-10en_AU
dc.date.statistics2020-06-01en_AU
dc.description.abstractSpeleothem trace element time series are constructed from the infiltrating drip water geochemistry, and hence are examined under contrasting rainfall conditions associated with El Niño and La Niña phases of ENSO. The aim was to identify suitable inorganic element proxies for palaeoclimate interpretation in speleothem records from Harrie Wood Cave, Yarrangobilly. The drip water chemical composition at the stalactite tip reflects a contribution from different endmembers and processes; therefore it is necessary to study the different sources, pathways and processes that occur as water migrates through the atmosphere-soil-karst system. Here we present high resolution aerosol, rainfall and drip water 18O and inorganic drip-water datasets. Analysis of aerosol samples above the caves reveals the atmosphere supplies a suite of elements from automobile emissions, windblown soil, smoke, secondary sulfate and aged sea salt sources. The bedrock and aerosols were identified as contributory sources of solutes to the drip water. The clay-rich soil zone was recognised as a sink for inorganic elements, and a secondary source for Zn. In soil, a number of processes were demonstrated to modify the chemical composition of the resultant drip waters. The drip water chemistry is driven by the long-term gradient in the cumulative water balance. The flow paths feeding the drip sites were shown to be fracture flow, from a ventilated well-mixed pocket within the epikarst storage reservoir. Dilution and reduced prior calcite precipitation (PCP) controlled the drip-water chemistry during the La Niña/wet years whereas enhanced PCP was observed during the El Niño and dry periods. Mg and Sr show particular promise as paleoclimate proxies for drought and flood events, while with further research Na, K and Zn may also be reliably used. These findings will be applied in a modern speleothem record. © Author(s)en_AU
dc.identifier.citationTadros, C. V., Treble, P. C., & Baker, A. (2018). Trace elements: from sources to cave drip water, south-eastern Australia. Paper presented at the Aqua Biennial Conference, Canberra, 10-14 December 2018, (pp. 58). https://aqua.org.au/wp-content/uploads/2019/10/AQUA-2018-Program.pdfen_AU
dc.identifier.conferenceenddate14 December 2018en_AU
dc.identifier.conferencenameAQUA Biennial Conferenceen_AU
dc.identifier.conferenceplaceCanberra, Australiaen_AU
dc.identifier.conferencestartdate10 December 2018en_AU
dc.identifier.govdoc9652en_AU
dc.identifier.pagination58en_AU
dc.identifier.urihttps://aqua.org.au/wp-content/uploads/2019/10/AQUA-2018-Program.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9535en_AU
dc.language.isoenen_AU
dc.publisherAustralasian Quaternary Association Inc.en_AU
dc.subjectElementsen_AU
dc.subjectTrace amountsen_AU
dc.subjectCavesen_AU
dc.subjectAustraliaen_AU
dc.subjectWateren_AU
dc.subjectGeochemistryen_AU
dc.subjectRainen_AU
dc.subjectSouthern Oscillationen_AU
dc.subjectAerosolsen_AU
dc.subjectSoilsen_AU
dc.titleTrace elements: from sources to cave drip water, south-eastern Australiaen_AU
dc.typeConference Abstracten_AU
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