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dc.contributor.authorWarke, Matthew R.
dc.contributor.authorSchröder, Stefan
dc.contributor.authorStrauss, Harald
dc.identifier.citationWarke , M R , Schröder , S & Strauss , H 2018 , ' Testing models of pre-GOE environmental oxidation : a Paleoproterozoic marine signal in platform dolomites of the Tongwane Formation (South Africa) ' , Precambrian Research , vol. 313 , pp. 205-220 .
dc.identifier.otherPURE: 252871246
dc.identifier.otherPURE UUID: 2b484fe7-edd8-4f0c-aa80-dd4cfd2d8b52
dc.identifier.otherRIS: urn:E1174EF81F50C8D82E60643DF3BAF483
dc.identifier.otherScopus: 85047439459
dc.identifier.otherORCID: /0000-0001-9830-0383/work/43873428
dc.identifier.otherWOS: 000436883700013
dc.descriptionMRW was supported by a NERC-studentship through the University of Manchester. SS was supported through a Strategy Grant of the Faculty of Engineering and Physical Sciences at the University of Manchester.en
dc.description.abstractCarbonate facies of the upper Tongwane Formation preserve a largely overlooked record of pre-GOE Paleoproterozoic seawater. This inventory has survived despite a complex paragenetic history involving both diagenetic and contact metamorphic processes. BIF mineral assemblages are dominated by a medium-grade grunerite overprint and the formation of prograde and retrograde riebeckite. The massive dolomite member, a platform top carbonate which caps the succession, is characterized by marine REYSN patterns lacking significant negative CeSN anomalies (<10%) and δ13Ccarb values of between +1.83 and +2.95 ‰VPDB that are slightly elevated above Paleoproterozoic ‘normal marine’ values. Systematically decreasing δ13Ccarb values measured in monotonously recrystallized, talc bearing, slope carbonates reflect interaction with devolatilization fluids during contact metamorphism caused by the intrusion of the Bushveld Igneous Complex; slope carbonates offer no insight into marine paleoredox conditions. Thus, despite contact metamorphism, Paleoproterozoic marine signals are retained in platform-top dolomites, however they do not support claims for widespread oxygen accumulation in shallow depositional environments of the Transvaal Basin on the eve of the GOE.
dc.relation.ispartofPrecambrian Researchen
dc.rights© 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (
dc.subjectTongwane Formationen
dc.subjectTransvaal Supergroupen
dc.subjectGreat Oxidation Eventen
dc.subjectCerium anomaliesen
dc.subjectCarbon isotopesen
dc.subjectQE Geologyen
dc.titleTesting models of pre-GOE environmental oxidation : a Paleoproterozoic marine signal in platform dolomites of the Tongwane Formation (South Africa)en
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.description.statusPeer revieweden

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