{"title":"Pyrite Re–Os Geochronology of the Erlian Uranium District: an Alternative Dating Method for Sandstone-type Uranium Deposits","authors":"C. Zhang, X. D. Li, C. H. Liu","doi":"10.1134/s1075701523600081","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Owing to the lack of precise and reliable mineralization ages, the origins of some sandstone-type U deposits (STUDs) are still debated. The unusual texture of U ore (commonly uraninite) and the difference between the chemical characteristics of U and its radiogenic daughter isotopes make U–Pb dating unsuitable for STUDs. However, STUDs are commonly rich in Re; therefore, Re–Os dating may be an alternative. Re–Os dating of two groups of pyrite samples from U ores in the Erlian sandstone-type U district yields two similar ages: 52.5 ± 4.7 and 53.3 ± 3.5 Ma. These ages are consistent with previous U–Pb ages (56.5 ± 7.5 and 63 ± 22 Ma) and demonstrate the reliability of sulfide Re–Os dating of STUDs. The pyrite Re–Os ages suggest that the Erlian STUDs formed at ~53 Ma, corresponding to the regional uplift of the Erlian basin during the Late Cretaceous–Early Eocene and the humid environment in the region during the Early Eocene Climatic Optimum.</p>","PeriodicalId":12719,"journal":{"name":"Geology of Ore Deposits","volume":null,"pages":null},"PeriodicalIF":0.8000,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geology of Ore Deposits","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1134/s1075701523600081","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOLOGY","Score":null,"Total":0}
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Abstract
Owing to the lack of precise and reliable mineralization ages, the origins of some sandstone-type U deposits (STUDs) are still debated. The unusual texture of U ore (commonly uraninite) and the difference between the chemical characteristics of U and its radiogenic daughter isotopes make U–Pb dating unsuitable for STUDs. However, STUDs are commonly rich in Re; therefore, Re–Os dating may be an alternative. Re–Os dating of two groups of pyrite samples from U ores in the Erlian sandstone-type U district yields two similar ages: 52.5 ± 4.7 and 53.3 ± 3.5 Ma. These ages are consistent with previous U–Pb ages (56.5 ± 7.5 and 63 ± 22 Ma) and demonstrate the reliability of sulfide Re–Os dating of STUDs. The pyrite Re–Os ages suggest that the Erlian STUDs formed at ~53 Ma, corresponding to the regional uplift of the Erlian basin during the Late Cretaceous–Early Eocene and the humid environment in the region during the Early Eocene Climatic Optimum.
期刊介绍：
Geology of Ore Deposits is a periodical covering the topic of metallic and nonmetallic mineral deposits, their formation conditions, and spatial and temporal distribution. The journal publishes original scientific articles and reviews on a wide range of problems in theoretical and applied geology. The journal focuses on the following problems: deep geological structure and geodynamic environment of ore formation; distribution pattern of metallogenic zones and mineral deposits; geology and formation environment of large and unique metallic and nonmetallic deposits; mineralogy of metallic and nonmetallic deposits; physicochemical and isotopic characteristics and geochemical environment of ore deposition; evolution of ore-forming systems; radiogeology and radioecology, economic problems in exploring, developing, and mining of ore commodities.
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