Hydrogeochemical processes in a monsoon dominated karst environment, NW Queensland

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dc.contributor.authorVan der Ley, Men_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorGraham, ITen_AU
dc.contributor.authorSpencer, Jen_AU
dc.date.accessioned2022-11-08T04:33:07Zen_AU
dc.date.available2022-11-08T04:33:07Zen_AU
dc.date.issued2012-08-05en_AU
dc.date.statistics2022-01-31en_AU
dc.description.abstractThe Lawn Hill region, NW Queensland Australia, is host to perennial streams fed by springs from a large karstic aquifer with sub-modern (>50 y) groundwater, developed in Cambrian carbonate lithologies. NW Queensland is subject to semi-arid monsoon climates, and consequently the modern ground and surface waters and their interactions are greatly dependent on seasonal variability of rainfall. We have used a range of techniques to evaluate hydrogeochemical processes including geochemical analysis of host rocks, and a range of isotopic and chemical analyses of ground and surface waters. Samples were collected over multiple sampling campaigns, including during the wet season. Surface waters and groundwaters from carbonate terrains were found to be similarly Ca(Mg) HCO3 type waters as expected from interactions with the karst carbonates, which were found to be composed of primarily dolomite and minor chert. However, there are many indicators (14C, 3H and others) of a more complex system with different temporal scales. Surface waters, while showing dolomitic interactions, have compositions which suggest interaction with underlying silicic lithologies before forming springs. Also, variability in the strength and timing of the monsoon appears to have an effect on activation of different springs and groundwater flow. Additionally, there are groundwaters with much longer residence times (∼6000 a) and chemistries indicative of interaction with silicic and underlying Proterozoic sedimentary units. en_AU
dc.identifier.citationvan der Ley, M., Cendón, D., Graham. I., & Spencer, J. (2012). Hydrogeochemical processes in a monsoon dominated karst environment, NW Queensland. Paper presented to the 34th International Geological Congress 2012, "Unearthing our Past and Future - Resourcing Tomorrow", Brisbane, Australia, 5-10 August 2012, (pp. 1442).en_AU
dc.identifier.conferenceenddate10 August 2012en_AU
dc.identifier.conferencename34th International Geological Congress 2012, 'Unearthing our Past and Future - Resourcing Tomorrow'en_AU
dc.identifier.conferenceplaceBrisbane, Australiaen_AU
dc.identifier.conferencestartdate5 August 2012en_AU
dc.identifier.pagination1442en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14004en_AU
dc.language.isoenen_AU
dc.publisherAustralian Geosciences Councilen_AU
dc.subjectMonsoonsen_AU
dc.subjectCavesen_AU
dc.subjectQueenslanden_AU
dc.subjectAustraliaen_AU
dc.subjectGround wateren_AU
dc.subjectClimatesen_AU
dc.subjectCarbon 14en_AU
dc.subjectLithologyen_AU
dc.titleHydrogeochemical processes in a monsoon dominated karst environment, NW Queenslanden_AU
dc.typeConference Abstracten_AU
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