Cave drip water solutes in south-eastern Australia: constraining sources, sinks and processes

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dc.contributor.authorTadros, CVen_AU
dc.contributor.authorTreble, PCen_AU
dc.contributor.authorBaker, AAen_AU
dc.contributor.authorHankin, SIen_AU
dc.contributor.authorRoach, Ren_AU
dc.date.accessioned2024-10-04T05:38:05Zen_AU
dc.date.available2024-10-04T05:38:05Zen_AU
dc.date.issued2019-02-15en_AU
dc.date.statistics2024-10-04en_AU
dc.description.abstractConstraining sources and site-specific processes of trace elements in speleothem geochemical records is key to an informed interpretation. This paper examines a 10-year data set of drip water solutes from Harrie Wood Cave, south-eastern Australia, and identifies the processes that control their response to El Niño-Southern Oscillation events which varies the site water balance. The contributions of aerosol and bedrock end-members are quantified via hydrochemical mass balance modelling. The parent bedrock is the main source for the drip water solutes: Mg, Sr, K and trace elements (Ba, Al, V, Cr, Mn, Ni, Co, Cu, Pb and U), while atmospheric aerosol inputs also contribute significantly to drip water trace elements and Na, K and Zn. A laboratory investigation evaluating water-soluble fractions of metals in soil samples and soil enrichment factors provided a basis for understanding metal retainment and release to solution and transport from the soil zone. These results identified the role of the soil as a sink for: trace metals, Na and K, and a secondary source for Zn. Further, soil processes including: cation exchange, K-fixation, metal adsorption to colloids and the release of Zn associated with organic matter degradation further modify the chemical composition of the resultant drip waters. This research is significant for the south-eastern Australian region, as well as other sites in a karst setting with clay-rich soil. In particular these results reveal that the response of drip water chemistry to hydroclimatic forcing is non-linear, with the greatest response observed when the long-term gradient in the cumulative water balance reverses. This longer-term drip water monitoring dataset is significant because it provides the pivotal framework required to reliably identify suitable trace element proxies for interpretation in geochemical speleothem records on multi-decadal timescales. © 2018 Crown Copyright © 2018 Published by Elsevier B.V.en_AU
dc.format.mediumPrint-Electronicen_AU
dc.identifier.citationTadros, C. V., Treble, P. C., Baker, A., Hankin, S., & Roach, R. (2019). Cave drip water solutes in south-eastern Australia: Constraining sources, sinks and processes. Science of the Total Environment, 651(2), 2175-2186. doi:10.1016/j.scitotenv.2018.10.035en_AU
dc.identifier.issn0048-9697en_AU
dc.identifier.issn1879-1026en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleThe Science of The Total Environmenten_AU
dc.identifier.pagination2175-2186en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.scitotenv.2018.10.035en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15739en_AU
dc.identifier.volume651en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectTrace amountsen_AU
dc.subjectAerosolsen_AU
dc.subjectColloidsen_AU
dc.subjectSoilsen_AU
dc.subjectMetalsen_AU
dc.subjectAdsorptionen_AU
dc.subjectOrganic matteren_AU
dc.subjectClaysen_AU
dc.subjectWateren_AU
dc.titleCave drip water solutes in south-eastern Australia: constraining sources, sinks and processesen_AU
dc.typeJournal Articleen_AU
dcterms.dateAccepted2018-10-03en_AU
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