Genesis of uranium deposits in Neogene sedimentary rocks overlying the Menderes metamorphic massif, Turkey

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dc.contributor.authorYilmaz H.
dc.date.accessioned2019-10-27T00:36:11Z
dc.date.available2019-10-27T00:36:11Z
dc.date.issued1980
dc.departmentEge Üniversitesien_US
dc.description.abstractUranium deposits in the Köprübaş? area of western Turkey occur in fluviatile sedimentary rocks which are underlain by high-grade metamorphic rocks of the Menderes massif. These deposits occur in Neogene conglomerate beds that contain a matrix of abundant silt and clay and are in beds of sandstone. Uranium is present as a matrix impregnation in tabular lenses within the conglomerate and sandstone beds. Both oxidized and unoxidized deposits occur. Oxidized deposits can be divided into jarosite-waylandite-rich and ilmenite-rich types, both of which occur near exposures of metamorphic basement rocks. Uranium in the ilmenite-rich type is disseminated uniformly throughout the sandy matrix of the conglomerate. Uranium in unoxidized sandstone is disseminated throughout the clayey matrix and is associated with authigenic pyrite and siderite. Ore-grade uranium concentrations in the unoxidized deposits are confined to pyrite-rich zones, whereas only low-grade mineralization occurs in siderite-rich zones. Authigenic pyrite formed during diagenesis. This pyrite subsequently reduced oxygenic uraniferous groundwater and induced precipitation of the uranium. Oxidized jarosite-waylandite-associated uranium deposits apparently formed by oxidation of reduced uranium deposits. Therefore, all the deposits are epigenetic in origin, formed by precipitation of uranium by groundwater solutions that moved through the host rock. The basement metamorphic rocks are believed to have been the major source of uranium. © 1980.en_US
dc.description.sponsorshipThe author is grateful to Prof. R.W. Hutchinson and Prof. W.S. Fyfe for their keen interest in this research and for their helpful advice. Thanks are due to R.L. Barnett performing the microprobe analyses. The Mineral Research and Exploration Institute of Turkey provided analytical data and opportunity to work on the KSpriiba~l uranium deposits. --en_US
dc.identifier.doi10.1016/0009-2541(80)90086-8
dc.identifier.endpage210en_US
dc.identifier.issn0009-2541
dc.identifier.issn0009-2541en_US
dc.identifier.issueCen_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage185en_US
dc.identifier.urihttps://doi.org/10.1016/0009-2541(80)90086-8
dc.identifier.urihttps://hdl.handle.net/11454/24504
dc.identifier.volume31en_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.relation.ispartofChemical Geologyen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.titleGenesis of uranium deposits in Neogene sedimentary rocks overlying the Menderes metamorphic massif, Turkeyen_US
dc.typeArticleen_US

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