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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/9618

Title: Eight-years of cave monitoring at Golgotha Cave, SW Australia: implications for speleothem paleoclimate records
Authors: Treble, PC
Fairchild, IJ
Baker, A
Bradley, C
Wood, A
McGuire, L
Keywords: Western Australia
Caves
Forests
Oxygen
Monitoring
Water
Qnaternary period
Rain
Issue Date: 29-Jun-2014
Publisher: Australasian Quaternary Association Inc
Citation: Treble, P. C., Fairchild, I. J., Baker, A., Bradley, C., Wood, A., & McGuire, L. (2014). Eight-years of cave monitoring at Golgotha Cave, SW Australia: implications for speleothem paleoclimate records. Paper presented at the AQUA Biennial Meeting The Grand Hotel, Mildura, 29th June - 4th July, 2014.
Abstract: Speleothems are an important archive of paleoenvironmental information but a thorough understanding of processes are necessary for their interpretation. In order to better understand speleothem records from the climatically-sensitive southwest region of WA, we have conducted a detailed eight-year monitoring study at Golgotha Cave, southwest WA. Oxygen isotopic data demonstrated that the majority of water moved through the porous Quaternary calcarenite as matrix-flow with an inferred transit time of <1 year. A zone of high-flow dripwater is fed by high-magnitude rainfall events (Treble et al., 2013). Prior calcite precipitation (PCP) signals of increased Mg/Ca and Sr/Ca in dripwater are attributed to stalactite deposition. This signal is enhanced at low-flow sites and minimised at the high-flow site as degassing and subsequent stalactite deposition are a function of drip interval. Long-term rising trends found in most solutes are attributed via a mass-balance approach to increasing forest bioproductivity, consistent with an increase in forest understorey following a low-intensity burn in 2006. A fundamental message from this study is that individual speleothem records from within Golgotha Cave will differ, e.g. speleothem δ18O at our high-flow site is biased to recording high-magnitude rainfall events, whilst PCP will be the main driver of speleothem Mg/Ca and Sr/Ca at low-flow sites. Forest biomass appears to be modulating transpiration-sensitive ions and these may serve as an indicator of fire history.
URI: https://aqua.org.au/wp-content/uploads/2013/06/AQUA2014-program.pdf
http://apo.ansto.gov.au/dspace/handle/10238/9618
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