Evolution of dissolved inorganic carbon in groundwater recharged by cyclones and groundwater age estimations using the 14C statistical approach

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dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorHan, LFen_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorCrawford, Jen_AU
dc.contributor.authorHankin, SIen_AU
dc.contributor.authorPeterson, MAen_AU
dc.contributor.authorHollins, SEen_AU
dc.date.accessioned2021-03-04T05:06:51Zen_AU
dc.date.available2021-03-04T05:06:51Zen_AU
dc.date.issued2018-01-01en_AU
dc.date.statistics2021-03-04en_AU
dc.description.abstractThe Canning Basin is the largest sedimentary basin in Western Australia and is located in one of the most cyclone prone regions of Australia. Despite its importance as a future resource, limited groundwater data is available for the Basin. The main aims of this paper are to provide a detailed understanding of the source of groundwater recharge, the chemical evolution of dissolved inorganic carbon (DIC) and provide groundwater age estimations using radiocarbon (14CDIC). To do this we combine hydrochemical and isotopic techniques to investigate the type of precipitation that recharge the aquifer and identify the carbon processes influencing 14CDIC, δ13CDIC, and [DIC]. This enables us to select an appropriate model for calculating radiocarbon ages in groundwater. The aquifer was found to be recharged by precipitation originating from tropical cyclones imparting lower average δ2H and δ18O values in groundwater (−56.9‰ and −7.87‰, respectively). Water recharges the soil zone rapidly after these events and the groundwater undergoes silicate mineral weathering and clay mineral transformation processes. It was also found that partial carbonate dissolution processes occur within the saturated zone under closed system conditions. Additionally, the processes could be lumped into a pseudo-first-order process and the age could be estimated using the 14C statistical approach. In the single-sample-based 14C models, 14C0 is the initial 14CDIC value used in the decay equation that considers only 14C decay rate. A major advantage of using the statistical approach is that both 14C decay and geochemical processes that cause the decrease in 14CDIC are accounted for in the calculation. The 14CDIC values of groundwater were found to increase from 89 pmc in the south east to around 16 pmc along the groundwater flow path towards the coast indicating ages ranging from modern to 5.3 ka. A test of the sensitivity of this method showed that a ∼15% error could be found for the oldest water. This error was low when compared to single-sample-based models. This study not only provides the first groundwater age estimations for the Canning Basin but is the first groundwater dating study to test the sensitivity of the statistical approach and provide meaningful error calculations for groundwater dating. Crown Copyright © 2017 Published by Elsevier Ltd.en_AU
dc.identifier.citationMeredith, K. T., Han, L. F., Cendón, D. I., Crawford, J., Hankin, S., Peterson, M., & Hollins, S. E. (2018). Evolution of dissolved inorganic carbon in groundwater recharged by cyclones and groundwater age estimations using the 14C statistical approach. Geochimica et Cosmochimica Acta, 220, 483-498. doi:10.1016/j.gca.2017.09.011en_AU
dc.identifier.issn0016-7037en_AU
dc.identifier.journaltitleGeochimica et Cosmochimica Actaen_AU
dc.identifier.pagination483-498en_AU
dc.identifier.urihttps://doi.org/10.1016/j.gca.2017.09.011en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10481en_AU
dc.identifier.volume220en_AU
dc.language.isoenen_AU
dc.publisherElsevier B. V.en_AU
dc.subjectCarbon 14en_AU
dc.subjectSedimentary basinsen_AU
dc.subjectGroundwater rechargeen_AU
dc.subjectWestern Australiaen_AU
dc.subjectAustraliaen_AU
dc.subjectCyclonesen_AU
dc.subjectWater chemistryen_AU
dc.titleEvolution of dissolved inorganic carbon in groundwater recharged by cyclones and groundwater age estimations using the 14C statistical approachen_AU
dc.typeJournal Articleen_AU
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