| 桃山-诸广铀成矿带成岩成矿年代学研究进展及存在问题 |
| Received:May 20, 2021 Revised:December 25, 2021 点此下载全文 |
| 引用本文：WU Jia,WU JianHua,LIU XiaoDong.2022.Progresses and problems on chronology of rock forming and mineralization in Taoshan-Zhuguang uranium metallogenic belt[J].Mineral Deposits,41(2):241~254 |
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| Author Name | Affiliation | E-mail | | WU Jia | State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
School of Earth Science, East China University of Technology, Nanchang 330013, Jiangxi, China | | | WU JianHua | State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
School of Earth Science, East China University of Technology, Nanchang 330013, Jiangxi, China | | | LIU XiaoDong | State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
School of Earth Science, East China University of Technology, Nanchang 330013, Jiangxi, China | liuof99@163.com |
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| 基金项目:本文得到中国核工业地质局项目(编号:U20110816)和江西省教育厅科学技术研究项目(编号:GJJ180366)联合资助 |
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| 中文摘要:桃山-诸广铀成矿带位于钦杭结合带以南的华夏地块西部，属华东南铀成矿省，是中国最重要的花岗岩型铀成矿带。文章收集了该成矿带近十年获得的118组岩浆岩同位素年龄数据和41组铀成矿同位素年龄数据，通过遴选可信度较高的年龄数据，厘定成岩成矿年龄，并探讨岩浆岩活动与铀成矿时代的关系。结果表明：桃山-诸广铀成矿带的岩浆岩是加里东期、印支期和燕山期不同岩浆旋回的产物，下庄铀矿田和诸广铀矿田的储矿岩体主要为印支期，而桃山铀矿田的储矿岩体为燕山期；沥青铀矿测年结果显示，铀成矿具有多期多阶段性，主成矿期为燕山晚期，但高温绢英岩化型铀矿床属燕山早期铀矿化的产物；铀成矿与赋矿岩体之间存在较大的矿岩时差，但高温绢英岩化型和交点型铀矿床的矿化时期与矿田内基性岩浆活动的时间吻合，暗示基性岩浆活动可能与铀成矿作用存在成因联系。数据分析还表明，部分岩浆岩的锆石U-Pb加权平均年龄数据存在n＜10或MSWD＞2的问题，部分包含了高铀锆石的年龄数据，降低了锆石U-Pb年龄的可信度；而基性脉岩的锆石U-Pb加权平均年龄一般只能说明基性脉岩的形成年龄不早于这个年龄，不能代表基性脉岩的形成年龄。 |
| 中文关键词:地球化学 桃山-诸广铀成矿带 成岩成矿年代学 矿岩时差 研究进展 |
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| Progresses and problems on chronology of rock forming and mineralization in Taoshan-Zhuguang uranium metallogenic belt |
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| Abstract:The Taoshan-Zhuguang uranium metallogenic belt, located at west portion of Cathaysian block, south of the Qinzhou-Hangzhou junction zone, is one of the most important granite-related uranium metallogenic belts in southeast China uranium province. Over the past decade, 118 isotopic ages of magmatic rocks and 41 isotopic ages of uranium mineralization have been obtained by various studies. Following the analysis and evaluation of those previous chronology data, this study focuses on the screening of appropriate and reliable chronology data for host rock forming and uranium mineralization, and further discussing the relations of magmatic activity to uranium mineralization in Taoshan-Zhuguang uranium metallogenic belt. The results show that the multi-cycle magmatic activities in this metallogenic belt include three stages of Caledonian, Indosinian and Yanshanian. The ages of ore-bearing host rocks in Xiazhuang and Zhuguang uranium ore fields are mainly in Indosinian epoch, while the ages in Taoshan uranium ore field are mainly in Yanshanian epoch. Metallogenic ages of pitchblende indicated multi-periods and multi-stages uranium mineralization in study areas. In addition to the major uranium mineralization occurred in late Yanshanian, early Yanshanian uranium mineralization have been revealed, such as the high temperature sericitization type uranium deposits. Generally, there is a large gap between the ages of host rock and uranium mineralization, however the close temporal relations of mafic-dykes and high temperature sericitization type uranium deposits implies the possible genetic relationship between them. In the processing of data analysis, it is suggested that, in case of n＜10 or MSWD＞2 in data set or with the high-uranium contents in zircon, the zircon U-Pb isotopic age is normally not reliable. And the zircon U-Pb isotopic age for mafic-dykes only presents the upper age limit of its formation. |
| keywords:geochemistry Taoshan-Zhuguang uranium metallogenic belt chronology of rock forming and mineralization age gap between host rock and mineralization progresses |
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