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dc.contributor.authorWilson, Jonathan P.
dc.contributor.authorFischer, Woodward W.
dc.contributor.authorJohnston, David T
dc.contributor.authorKnoll, Andrew Herbert
dc.contributor.authorGrotzinger, John P.
dc.contributor.authorWalter, Malcolm R.
dc.contributor.authorMcNaughton, Neal J.
dc.contributor.authorSimon, Mel
dc.contributor.authorAbelson, John
dc.contributor.authorSchrag, Daniel P.
dc.contributor.authorSummons, Roger
dc.contributor.authorAllwood, Abigail
dc.contributor.authorAndres, Miriam
dc.contributor.authorGammon, Crystal
dc.contributor.authorGarvin, Jessica
dc.contributor.authorRashby, Sky
dc.contributor.authorSchweizer, Maia
dc.contributor.authorWatters, Wesley A.
dc.date.accessioned2011-04-04T20:25:23Z
dc.date.issued2010
dc.identifier.citationWilson, Jonathan P., Woodward W. Fischer, David T. Johnston, Andrew H. Knoll, John P. Grotzinger, Malcolm R. Walter, Neal J. McNaughton, et al. 2010. Geobiology of the late Paleoproterozoic Duck Creek Formation, Western Australia. Precambrian Research 179(1-4): 135-149.en_US
dc.identifier.issn0301-9268en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:4795338
dc.description.abstractThe ca. 1.8 Ga Duck Creek Formation, Western Australia, preserves 1000 m of carbonates and minor iron formation that accumulated along a late Paleoproterozoic ocean margin. Two upward-deepening stratigraphic packages are preserved, each characterized by peritidal precipitates at the base and iron formation and carbonate turbidites in its upper part. Consistent with recent studies of Neoarchean basins, carbon isotope ratios of Duck Creek carbonates show no evidence for a strong isotopic depth gradient, but carbonate minerals in iron formations can be markedly depleted in [super]13C. In contrast, oxygen isotopes covary strongly with depth; δ[super]18O values as positive as 2‰ VPDB in peritidal facies systematically decline to values of −6 to −16‰ in basinal rocks, reflecting, we posit, the timing of diagenetic closure. The Duck Creek Formation contains microfossils similar to those of the Gunflint Formation, Canada; they are restricted to early diagenetic cherts developed in basinal facies, strengthening the hypothesis that such fossils capture communities driven by iron metabolism. Indeed, X-ray diffraction data indicate that the Duck Creek basin was ferruginous throughout its history. The persistence of ferruginous waters and iron formation deposition in Western Australia for at least several tens of millions of years after the transition to sulfidic conditions in Laurentia suggests that the late Paleoproterozoic expansion of sulfidic subsurface waters was globally asynchronous.en_US
dc.description.sponsorshipEarth and Planetary Sciencesen_US
dc.description.sponsorshipOrganismic and Evolutionary Biologyen_US
dc.language.isoen_USen_US
dc.publisherElsevieren_US
dc.relation.isversionofdoi:10.1016/j.precamres.2010.02.019en_US
dash.licenseOAP
dc.subjectPaleoproterozoicen_US
dc.subjectcarbonen_US
dc.subjectoxygenen_US
dc.subjectiron formationen_US
dc.subjectmicrofossilsen_US
dc.titleGeobiology of the Late Paleoproterozoic Duck Creek Formation, Western Australiaen_US
dc.typeJournal Articleen_US
dc.description.versionAccepted Manuscripten_US
dc.relation.journalPrecambrian Researchen_US
dash.depositing.authorKnoll, Andrew Herbert
dc.date.available2011-04-04T20:25:23Z
dc.identifier.doi10.1016/j.precamres.2010.02.019*
dash.authorsorderedfalse
dash.contributor.affiliatedKnoll, Andrew
dash.contributor.affiliatedSchrag, Daniel
dash.contributor.affiliatedJohnston, David


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