Non-marine evaporites with both inherited marine and continental signatures: the Gulf of Carpentaria, Australia, at similar ~ 70 ka

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dc.contributor.authorPlayà, Een_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorTrave, Aen_AU
dc.contributor.authorChivas, ARen_AU
dc.contributor.authorGarcía, Aen_AU
dc.date.accessioned2008-04-23T04:04:36Zen_AU
dc.date.accessioned2010-04-30T05:03:19Zen_AU
dc.date.available2008-04-23T04:04:36Zen_AU
dc.date.available2010-04-30T05:03:19Zen_AU
dc.date.issued2007-10-15en_AU
dc.date.statistics2007-10en_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 a "Lake Carpentaria", perched above sea-level. In this environment, evaporitic conditions at about 70 ka produced a repetitive alternation of Pm to mm-thick evaporitic and micritic laminae with a varve-like appearance. These precipitates are interpreted as primary features, deposited in a shallow lake that retained limited water in its centre (core MD-32). 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 contracted to the deepest part of the basin along the north-eastern side of the basin. In a lake with smaller water volume, continental solutes became apparent. While Sr contents and sulfur isotopes indicate marine contributions, strontium isotopes and oxygen isotopes in sulfates reveal continental inputs and other processes such as recycling of previously precipitated evaporites, sulfate reduction and potential reservoir effects. Carbonate- delta C-13 and delta O-18 values in micritic levels also reveal a continental influence and perhaps variations in organic matter signatures associated with climatic variations and vegetation changes. The REE-normalized patterns in gypsum samples are like those found in northern Cape York rivers, restricting the potential continental inputs into the evaporatic basin to a limited geographical area. The small depletion in LREE-normalized patterns between gypsum and river samples is interpreted as a marine influence while depletions in HREE are considered to be the result of fractionation of HREE during gypsum crystallization. © 2007, Elsevier Ltd.en_AU
dc.identifier.citationPlayà, E., Cendón, D. I., Trave, A., Chivas, A. R., & García, A. (2007). Non-marine evaporites with both inherited marine and continental signatures: the Gulf of Carpentaria, Australia, at similar ~ 70 ka. Sedimentary Geology, 201(3-4), 267-285. doi:10.1016/j.sedgeo.2007.05.010en_AU
dc.identifier.govdoc1214en_AU
dc.identifier.issn0037-0738en_AU
dc.identifier.issue3-4en_AU
dc.identifier.journaltitleSedimentary Geologyen_AU
dc.identifier.pagination267-285en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.sedgeo.2007.05.010en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1113en_AU
dc.identifier.volume201en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectEvaporitesen_AU
dc.subjectAustraliaen_AU
dc.subjectSea levelen_AU
dc.subjectGeochemistryen_AU
dc.subjectSulfur isotopesen_AU
dc.subjectWateren_AU
dc.titleNon-marine evaporites with both inherited marine and continental signatures: the Gulf of Carpentaria, Australia, at similar ~ 70 kaen_AU
dc.typeJournal Articleen_AU
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