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dc.contributor.authorFox, David C.M.
dc.contributor.authorSpinks, S.C.
dc.contributor.authorThorne, R.L.
dc.contributor.authorBarham, Milo
dc.contributor.authorAspandiar, Mehrooz
dc.contributor.authorArmstrong, J.G.T.
dc.contributor.authorUysal, T.
dc.contributor.authorTimms, Nick
dc.contributor.authorPearce, M.A.
dc.contributor.authorVerrall, M.
dc.contributor.authorGodel, B.
dc.contributor.authorWhisson, B.
dc.date.accessioned2023-01-24T09:56:49Z
dc.date.available2023-01-24T09:56:49Z
dc.date.issued2020
dc.identifier.citationFox, D.C.M. and Spinks, S.C. and Thorne, R.L. and Barham, M. and Aspandiar, M. and Armstrong, J.G.T. and Uysal, T. et al. 2020. Mineralogy and geochemistry of atypical reduction spheroids from the Tumblagooda Sandstone, Western Australia. Sedimentology. 67 (1): pp. 677-698.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/90166
dc.identifier.doi10.1111/sed.12659
dc.description.abstract

Reduction spheroids are small-scale, biogenic, redox-controlled, metal enrichments that occur within red beds globally. This study provides the first analysis of the compositionally unique reduction spheroids of the Tumblagooda Sandstone. The work aims to account for their composition and consequently improve existing models for reduction spheroids generally, which presently fail to account for the mineralogy of the Tumblagooda Sandstone reduction spheroids. Interstitial areas between detrital grains contained in the cores of these reduction spheroids are dominated by microplaty haematite, in addition to minor amounts of svanbergite, gorceixite, anatase, uraninite, monazite and illite. The haematite-rich composition, along with an absence of base metal phases and the vanadiferous mica roscoelite, makes these reduction spheroids notable in comparison to other global reduction spheroid occurrences. Analyses of illite crystallinity provide values for samples of the Tumblagooda Sandstone host rock corresponding to heating temperatures of ca 200°C. Consequently, while Tumblagooda Sandstone reduction spheroids formed via the typical metabolic processes of dissimilatory metal-reducing bacteria, the combination of a unique mineralogy and illite crystallinity analysis provides evidence of more complex late-stage heating and reoxidation. This has not previously been recognised in other reduction spheroids and therefore expands the existing model for reduction spheroid genesis by also considering the potential for late-stage alteration. As such, future reduction spheroid studies should consider the potential impact of post-formation modification, particularly where they are to be used as evidence of ancient microbial processes; such as in the search for early evidence of life in the geological record on Earth or other planets. Additionally, because of their potential for modification, reduction spheroids serve as a record of the redox history of red beds and their study could provide insights into the evolution of redox conditions within a given red bed during its diagenesis. Finally, this paper also provides insights into the relatively understudied diagenetic history of the Tumblagooda Sandstone; supplying the first reliable and narrow constraints on its thermal history. This has important implications for the thermal history of the Carnarvon Basin and its petroleum prospectivity more broadly.

dc.languageEnglish
dc.publisherWILEY
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectGeology
dc.subjectCarnarvon Basin
dc.subjectdiagenesis
dc.subjecthaematite
dc.subjectmetal-reducing bacteria
dc.subjectPerth Basin
dc.subjectred beds
dc.subjectredox
dc.subjectsvanbergite
dc.subjectPHOSPHATE-SULFATE MINERALS
dc.subjectCARBONATE CONCRETIONS
dc.subjectRED BEDS
dc.subjectCONTINENTAL SEDIMENTS
dc.subjectHUMIC SUBSTANCES
dc.subjectCARNARVON BASIN
dc.subjectPROVENANCE
dc.subjectDIAGENESIS
dc.subjectHEMATITE
dc.subjectDEPOSITS
dc.titleMineralogy and geochemistry of atypical reduction spheroids from the Tumblagooda Sandstone, Western Australia
dc.typeJournal Article
dcterms.source.volume67
dcterms.source.number1
dcterms.source.startPage677
dcterms.source.endPage698
dcterms.source.issn0037-0746
dcterms.source.titleSedimentology
dc.date.updated2023-01-24T09:56:42Z
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusFulltext not available
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidTimms, Nick [0000-0003-2997-4303]
curtin.contributor.orcidAspandiar, Mehrooz [0000-0001-8459-7710]
curtin.contributor.orcidBarham, Milo [0000-0003-0392-7306]
curtin.contributor.researcheridTimms, Nick [A-4885-2008]
dcterms.source.eissn1365-3091
curtin.contributor.scopusauthoridTimms, Nick [6602657575]
curtin.contributor.scopusauthoridAspandiar, Mehrooz [6506909649]
curtin.contributor.scopusauthoridBarham, Milo [55059807200]


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