Buried, but not forgotten — reconciling climate dynamics with catchment evolution in the East Kimberley using 10Be & 26Al

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dc.contributor.authorSwander, ZJen_AU
dc.contributor.authorDosseto, Aen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorMifsud, Cen_AU
dc.contributor.authorFujioka, Ten_AU
dc.date.accessioned2022-11-08T04:06:56Zen_AU
dc.date.available2022-11-08T04:06:56Zen_AU
dc.date.issued2012-08-05en_AU
dc.date.statistics2022-01-31en_AU
dc.description.abstractIn the well entrenched bedrock rivers of northwest Australia, fluvial geomorphic processes rely both on intense energy pulses input to the hydrologic system, and the negation of bedrock choke points or “gates”. Established Quaternary paleoclimate records identify warm and wet interglacial conditions associated with catastrophic flood episodes along the inland Ord River during the Upper Pleistocene. Today, the “neo-Ord” cuts a jagged 600km mixed bed course through the semi-arid landscape of the East Kimberley, when seasonally inundated by monsoon. Beneath the Ivanhoe Plain near Kununnura, up to 30m of pre-Holocene aggraded valley fill obscure the river’s paleo-path to the Joseph Bonaparte Gulf, over 100km from present day mouth. By exploring the links between fluvial activity and monsoon variability, this project aims to constrain the chronology of bedrock channel migration in the transition from older to younger bedrock gates, and any associated incision. This was accomplished by quantifying 16 in situ bedrock minimum exposure ages from 5 study sites across varied lithologies. Terrestrial Cosmogenic Radionuclides (TCN), 10Be and 26Al, are the result of incoming cosmic radiation sparking spallation reactions penetrating ∼50cm of the the bedrock surface. Our results will test the hypothesis that multiple early interglacial intensifications of the regional monsoon, dating back to MIS 11, would provide the catalyst for trunk channel migration and a general disruption of the steady-state. Base level readjustment should manifest most clearly by rapid bedrock incision within gorges, and at back-cutting knickpoint retreats along unconstrained rock bars.en_AU
dc.identifier.citationSwander, Z., Dosseto, A., Fink, D., Mifsud, C., & Fujioka, T. (2012). Buried, but not forgotten — reconciling climate dynamics with catchment evolution in the East Kimberley using 10Be & 26Al. Paper presented to the 34th International Geological Congress 2012, "Unearthing our Past and Future - Resourcing Tomorrow"., Brisbane, Australia., 5-10 August 2012, (pp. 926).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.issnGC126626en_AU
dc.identifier.pagination926en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14003en_AU
dc.language.isoenen_AU
dc.publisherAustralian Geosciences Councilen_AU
dc.subjectWestern Australiaen_AU
dc.subjectAustraliaen_AU
dc.subjectGeomorphologyen_AU
dc.subjectQuaternary perioden_AU
dc.subjectMonsoonsen_AU
dc.subjectRocksen_AU
dc.subjectAluminiumen_AU
dc.subjectBerylliumen_AU
dc.titleBuried, but not forgotten — reconciling climate dynamics with catchment evolution in the East Kimberley using 10Be & 26Alen_AU
dc.typeConference Abstracten_AU
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