Geobiology of the Late Paleoproterozoic Duck Creek Formation, Western Australia

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Geobiology of the Late Paleoproterozoic Duck Creek Formation, Western Australia

Show simple item record Wilson, Jonathan P. Fischer, Woodward W. Johnston, David T Knoll, Andrew Herbert Grotzinger, John P. Walter, Malcolm R. McNaughton, Neal J. Simon, Mel Abelson, John Schrag, Daniel P. Summons, Roger Allwood, Abigail Andres, Miriam Gammon, Crystal Garvin, Jessica Rashby, Sky Schweizer, Maia Watters, Wesley A. 2011-04-04T20:25:23Z 2010
dc.identifier.citation Wilson, 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.issn 0301-9268 en_US
dc.description.abstract The 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.sponsorship Earth and Planetary Sciences en_US
dc.description.sponsorship Organismic and Evolutionary Biology en_US
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.relation.isversionof doi:10.1016/j.precamres.2010.02.019 en_US
dash.license OAP
dc.subject Paleoproterozoic en_US
dc.subject carbon en_US
dc.subject oxygen en_US
dc.subject iron formation en_US
dc.subject microfossils en_US
dc.title Geobiology of the Late Paleoproterozoic Duck Creek Formation, Western Australia en_US
dc.type Journal Article en_US
dc.description.version Accepted Manuscript en_US
dc.relation.journal Precambrian Research en_US Knoll, Andrew Herbert 2011-04-04T20:25:23Z

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