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Zircon chemistry and new laser ablation U–Pb ages for uraniferous granitoids in SW Cameroon

Acta Geochimica 2020年第1期39卷 43-66页

作者： V.F.Embui C.E.Suh J.M.Cottle J.Etame J.Mendes C.M.Agyingi A.Vishiti E.M.Shemang B.Lehmann Department of Geology University of BueaP.O.Box 63BueaSouth West RegionCameroon Ore Treatment Laboratory Institute of Geological and Mining Research(IRGM)P.O.Box 4110YaoundeNlongkakCameroon Department of Geology Mining and Environmental ScienceUniversity of BamendaP.O.Box 39BambiliCameroon Department of Earth Sciences and Earth Research Institute Webb Hall 2028University of CaliforniaSanta BarbaraCA 93106-9630USA Laboratory of Geosciences Natural resources and Environment Department of Earth SciencesFaculty of ScienceUniversity of DoualaP.O.Box 24157DoualaCameroon Department of Civil Engineering University Institute of TechnologyUniversity of DoualaP.O.Box 8698DoualaCameroon Departamento de Geologia IGEOUniversidade Federal do Rio de JaneiroCidade UniversitariaRio de Janeiro 21910-949Brazil Department of Earth and Environmental Sciences Botswana International University of Science and TechnologyPrivate Bag 16PalapyeBotswana Mineral Resources Technical University of ClausthalClausihal-ZellerfeldGermany

The Ekomedion two-mica granite,southwestern Cameroon,has potential for uranium and molybdenum ***,we present LA-ICP-MS U-Pb ages,Lu-Hf isotope characteristics,trace element concentrations and Ti-geothermometry of zircon from this granite hosting U-Mo mineralization in pegmatitic *** majority of zircon are CL-dark though some CL-bright cores were also identified.U-Pb zircon age data range from 121±3 to743±11 Ma with only 5 of 34 ages being near *** concordant mean age of 603±12 Ma is similar to ages of granitic intrusions along the Central African Shear Zone in *** ages with mean of261±6 Ma reveal open system behavior with respect to Pb and/or *** e Hfi values range from-20.3 *** implies that U-Mo was remobilized during partial melting of the surrounding *** Th/U>0.1 as well as an increasing Hf with decreasing Th/U indicates that fractional crystallization was the main factor that controlled U-Mo mineralization in pegmatitic pods.Y and Y/Ho ratios cluster from 29 to 33 close to the chondritic ratio of 28 and indicate fractionation of Y and Ho with low F contents during the earliest stages of *** stage accumulation of F-rich magmatic-hydrothermal fluids impacted U-Mo mineralization as a *** contains a prominent negative Eu anomaly pointing to a fractionating system rich in *** Ti-in-zircon temperatures span 672℃to1232℃with the temperatures at the high end reflecting interference from mineral inclusions in the zircon grains while the lower temperature values are linked to crystallization.

关键词： Zircons uranium-molybdenum Cameroon

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