Evaporites with inherited marine and continental signatures: the Gulf of Carpentaria, Australia, at ~70 ka

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dc.contributor.authorCendón, DIen_AU
dc.contributor.authorPlayà, Een_AU
dc.contributor.authorChivas, ARen_AU
dc.contributor.authorTrave, Aen_AU
dc.contributor.authorWyndham, Ten_AU
dc.contributor.authorGarcia, Aen_AU
dc.contributor.authorHankin, SIen_AU
dc.date.accessioned2021-12-06T03:50:51Zen_AU
dc.date.available2021-12-06T03:50:51Zen_AU
dc.date.issued2007-07-12en_AU
dc.date.statistics2021-11-05en_AU
dc.description.abstractChanges in sea-level and associated climatic fluctuations resulted in extreme and cyclic changes in depositional environments in the Gulf of Carpentaria region (N, Australia). Disconnection from the sea led to the establishment of “Lake Carpentaria”. In this environment, evaporitic conditions at ~70 ka produced an alternation of μm to mm-thick evaporitic and micritic laminae. These precipitates are primary features, deposited in a shallow lake. Elemental and isotope geochemistry of gypsum and micrite laminae show a complex evaporitic environment where initially marine waters evaporated with the input of continental waters compensating for evaporative losses. Reduced continental input could not support a lake of the initial dimensions and the lake retracted to the deepest part of the basin along the north-eastern side. In a lake with smaller water volume, continental solutes became dominant. The strontium contents of gypsum range from 691 to 1353 ppm, gypsum-δ34S values from +21.8 to +22.5%, gypsum-δ18O values from +14.1 to +16.5% and 87Sr/86Sr from 0.7093 to 0.7098. While Sr contents and sulfur isotopes indicate marine contributions, strontium isotopes and oxygen isotopes in sulfates reveal continental inputs and processes such as recycling of evaporites, sulfate reduction and potential reservoir effects. Carbonate-δ13C and δ18O values in micrite also reveal a continental influence and perhaps variations in organic matter signatures associated with climatic and vegetation changes. In order to assess the provenance of continental waters reaching Lake Carpentaria at this time, REE elements in evaporitic gypsum were analysed and compared to results from modern rivers in the area. The REE-normalized patterns in gypsum samples are like those found in northern Cape York rivers (and unlike seawater), restricting the potential continental inputs into the evaporatic basin to a limited geographical area. The thickness of the calcite-gypsum couplets is consistent with those precipitated annually in modern evaporitic environments. This and the marked fluctuation between dry (gypsum laminae) and wet (micritic layer) suggests a reduced monsoon-like rainfall pattern operating in northern Australia during evaporite precipitation. © 2007 Elsevieren_AU
dc.identifier.citationCendon, D., Playa, E., Chivas, A. R., Trave, A., Wyndham, T., Garcia, A., & Hankin, S. I. (2007). Evaporites with inherited marine and continental signatures: the Gulf of Carpentaria, Australia, at ~70 ka. Paper presented to the XVII INQUA Congress 2007, 28th July to 3rd August 2007 Cairns, Queensland, Australia. In Quaternary International, 167-168, 65. doi:10.1016/j.quaint.2007.04.001en_AU
dc.identifier.conferenceenddate3 August 2007en_AU
dc.identifier.conferencenameXVII INQUA Congress 2007en_AU
dc.identifier.conferenceplaceCairns, Queenslanden_AU
dc.identifier.conferencestartdate28 July 2007en_AU
dc.identifier.issn1040-6182en_AU
dc.identifier.journaltitleQuaternary Internationalen_AU
dc.identifier.pagination65en_AU
dc.identifier.urihttps://doi.org/10.1016/j.quaint.2007.04.001en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12355en_AU
dc.identifier.volume167-168en_AU
dc.language.isoenen_AU
dc.publisherElsevier B. V.en_AU
dc.subjectAustraliaen_AU
dc.subjectQueenslanden_AU
dc.subjectSea levelen_AU
dc.subjectClimatic changeen_AU
dc.subjectEnvironmenten_AU
dc.subjectGeochemistryen_AU
dc.subjectIsotopesen_AU
dc.subjectStrontiumen_AU
dc.subjectGypsumen_AU
dc.subjectLakesen_AU
dc.subjectEvaporationen_AU
dc.subjectPrecipitationen_AU
dc.titleEvaporites with inherited marine and continental signatures: the Gulf of Carpentaria, Australia, at ~70 kaen_AU
dc.typeConference Abstracten_AU
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