An unrecognised holocene palaeo-lake at the terminus of the Murray-Darling Basin: a palaeo-discharge record and implications for current climate reconstructions

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dc.contributor.authorDe Carli, Een_AU
dc.contributor.authorHubble, Ten_AU
dc.contributor.authorPenny, Den_AU
dc.contributor.authorPetley, DNen_AU
dc.contributor.authorClarke, SLen_AU
dc.contributor.authorHamilton, RJen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorBrand, HEAen_AU
dc.date.accessioned2020-10-20T01:18:40Zen_AU
dc.date.available2020-10-20T01:18:40Zen_AU
dc.date.issued2015-12-14en_AU
dc.date.statistics2020-10-20en_AU
dc.description.abstractThe 1.073 million km2 Murray-Darling River Basin (MDB) drains 14% of Australia’s landmass, incorporates Australia’s most economically important agricultural region, and presents one of Australia’s most important and contentious water security challenges. The twin Murray and Darling catchments extend from the sub-tropics to the mid latitudes, with catchment precipitation driven by synoptic-scale oceanic-atmospheric processes that include the Australian Monsoon, SAM, IPO, PDO, IOD and ENSO. In this study we report the discovery of a hitherto unrecognised terminal palaeo-lake system ‘Lake Mannum’ that existed during the middle to late Holocene, as evidenced by an extensive sequence of laminated muds. The deposit contains gray laminae enriched in smectite and Nd/Ti, diagnostic of palaeo-discharges originating from the Darling catchment. These gray laminae are set within olive-black background muds enriched in illite, K and Rb, diagnostic of palaeo-discharges originating from the Murray Catchment. The deposit reflects the hydrological regime of the MDB, representing the first in-situ palaeo-discharge record for the MDB and a proxy record for south-eastern Australia’s precipitation and hydroclimate. Given the strong influence of major oceanic-atmospheric synoptic circulation over the river system, variability in MDB discharge and delivery of suspended sediment flux to the continental shelf have been used as proxy indicators for south-eastern Australia’s palaeo-climate during the Holocene. The existence of palaeo-lake Mannum at the terminus of the MDB suggests that discharge of terrigenous sediment to the Southern Ocean was strongly suppressed during this time, meaning that Holocene climate reconstructions which rely on the marine sediment record require re-evaluation. © 2014 American Geophysical Union.en_AU
dc.identifier.citationDe Carli, E., Hubble, T., Penny, D., Petley, D. N., Clarke, S. L., Hamilton, R. J., Gadd, P., & Brand, H. (2015). An unrecognised holocene palaeo-lake at the terminus of the Murray-Darling Basin: a palaeo-discharge record and implications for current climate reconstructions. Poster session at the AGU Fall Meeting, San Francisco, 14 - 18 December 2015.en_AU
dc.identifier.conferenceenddate18 December 2015en_AU
dc.identifier.conferencenameAGU Fall Meetingen_AU
dc.identifier.conferenceplaceSan Franciscoen_AU
dc.identifier.conferencestartdate14 December 2015en_AU
dc.identifier.otherPP13C-2308en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm15/webprogram/Paper85529.htmlen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/9914en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.subjectAustraliaen_AU
dc.subjectRiversen_AU
dc.subjectSedimentary basinsen_AU
dc.subjectAgricultureen_AU
dc.subjectWateren_AU
dc.subjectPrecipitationen_AU
dc.subjectDroughtsen_AU
dc.subjectClimatesen_AU
dc.subjectWatershedsen_AU
dc.titleAn unrecognised holocene palaeo-lake at the terminus of the Murray-Darling Basin: a palaeo-discharge record and implications for current climate reconstructionsen_AU
dc.typeConference Posteren_AU
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