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dc.contributor.authorFairchild, Ian J.
dc.contributor.authorFleming, Edward J.
dc.contributor.authorBao, Huiming
dc.contributor.authorBenn, Douglas I.
dc.contributor.authorBoomer, Ian
dc.contributor.authorDublyansky, Yuri V.
dc.contributor.authorHalverson, Galen P.
dc.contributor.authorHambrey, Michael J.
dc.contributor.authorHendy, Chris
dc.contributor.authorMcMillan, Emily A.
dc.contributor.authorSpötl, Christoph
dc.contributor.authorStevenson, Carl T. E.
dc.contributor.authorWynn, Peter M.
dc.date.accessioned2017-02-05T00:32:42Z
dc.date.available2017-02-05T00:32:42Z
dc.date.issued2016-02
dc.identifier.citationFairchild , I J , Fleming , E J , Bao , H , Benn , D I , Boomer , I , Dublyansky , Y V , Halverson , G P , Hambrey , M J , Hendy , C , McMillan , E A , Spötl , C , Stevenson , C T E & Wynn , P M 2016 , ' Continental carbonate facies of a Neoproterozoic panglaciation, north-east Svalbard ' , Sedimentology , vol. 63 , no. 2 , pp. 443-497 . https://doi.org/10.1111/sed.12252en
dc.identifier.issn1365-3091
dc.identifier.otherPURE: 241163216
dc.identifier.otherPURE UUID: 98dc5e8c-5383-4879-b856-9a061e588f10
dc.identifier.otherBibtex: urn:9a0f5591f80d99c668c31967436d6375
dc.identifier.otherScopus: 84957678533
dc.identifier.otherWOS: 000372268900007
dc.identifier.otherORCID: /0000-0002-3604-0886/work/64697404
dc.identifier.urihttp://hdl.handle.net/10023/10231
dc.descriptionThe fieldwork and subsequent analyses were funded by Natural Environment Research Council grant GR3/NE/H004963/1 within project GAINS (Glacial Activity In Neoproterozoic Svalbard).en
dc.description.abstractThe Marinoan panglaciation (ca 650 to 635 Ma) is represented in north-east Svalbard by the 130 to 175 m thick Wilsonbreen Formation which contains syn-glacial carbonates in its upper 100 m. These sediments are now known to have been deposited under a CO2-rich atmosphere, late in the glaciation, and global climate models facilitate testing of proposed analogues. Precipitated carbonates occur in four of the seven facies associations identified: Fluvial Channel (including stromatolitic and intraclastic limestones in ephemeral stream deposits); Dolomitic Floodplain (dolomite-cemented sand and siltstones, and microbial dolomites); Calcareous Lake Margin (intraclastic dolomite and wave-rippled or aeolian siliciclastic facies); and Calcareous Lake (slump-folded and locally re-sedimented rhythmic/stromatolitic limestones and dolomites associated with ice-rafted sediment). There is no strong cyclicity, and modern analogues suggest that sudden changes in lake level may exert a strong control on facies geometry. Both calcite and dolomite in stromatolites and rhythmites display either primary or early diagenetic replacive growth. Oxygen isotope values (−12 to +15‰VPDB) broadly covary with δ13C. High δ13C values of +3·5 to +4·5‰ correspond to equilibration with an atmosphere dominated by volcanically degassed CO2 with δ13C of −6 to −7‰. Limestones have consistently negative δ18O values, while rhythmic and playa dolomites preserve intermediate compositions, and dolocretes possess slightly negative to strongly positive δ18O signatures, reflecting significant evaporation under hyperarid conditions. Inferred meltwater compositions (−8 to −15·5‰) could reflect smaller Rayleigh fractionation related to more limited cooling than in modern polar regions. A common pseudomorph morphology is interpreted as a replacement of ikaite (CaCO3·H2O), which may also have been the precursor for widespread replacive calcite mosaics. Local dolomitization of lacustrine facies is interpreted to reflect microenvironments with fluctuating redox conditions. Although differing in (palaeo)latitude and carbonate abundance, the Wilsonbreen carbonates provide strong parallels with the McMurdo Dry Valleys of Antarctica.
dc.language.isoeng
dc.relation.ispartofSedimentologyen
dc.rights© 2015 The Authors. Sedimentology © 2015 International Association of Sedimentologists. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1111/sed.12252en
dc.subjectCarbon isotopesen
dc.subjectCryogenianen
dc.subjectIkaite pseudomorphsen
dc.subjectLacustrineen
dc.subjectOxygen isotopesen
dc.subjectSnowball Earthen
dc.subjectDASen
dc.titleContinental carbonate facies of a Neoproterozoic panglaciation, north-east Svalbarden
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews.Geography & Sustainable Developmenten
dc.contributor.institutionUniversity of St Andrews.Bell-Edwards Geographic Data Instituteen
dc.identifier.doihttps://doi.org/10.1111/sed.12252
dc.description.statusPeer revieweden
dc.date.embargoedUntil2017-02-04


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