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ZHU Wei-Ping. 2022. Chronological study advances of the granites and uranium mineralization in the Changjiang uranium ore-field. Geophysical and Geochemical Exploration, 46(6): 1327-1337. doi: 10.11720/wtyht.2022.1442
Citation: ZHU Wei-Ping. 2022. Chronological study advances of the granites and uranium mineralization in the Changjiang uranium ore-field. Geophysical and Geochemical Exploration, 46(6): 1327-1337. doi: 10.11720/wtyht.2022.1442
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Chronological study advances of the granites and uranium mineralization in the Changjiang uranium ore-field

  • 1. School of Earth Science,East China University of Technology,Nanchang 330013,China；

  • 2. Key Laboratory of Airborne Geophysics and Remote Sensing Geology,MNR,Beijing 100083,China；

  • 3. China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083,China

Received Date:  15 August 2021
Revised Date:  20 December 2022
Publish Date:  03 January 2023
    Abstract
  • The Changjiang uranium ore field is located in the south-central part of the Zhuguangshan pluton in northern Guangdong Province. This ore field holds many uranium deposits such as Mianhuakeng (302), Shulouqiu (305), and Changpai. These uranium deposits are mainly distributed along the contact parts between the Changjiang and Youdong plutons, and uranium mineralization is closely related to the Changjiang and Youdong plutons and their intrusive dykes. Previous researchers have conducted much testing on the formation ages of plutons, dykes, and deposits in the Changjiang ore field, obtaining abundant age data. This study summarized the chronological study advances of the granites, uranium mineralization, and dykes in the Changjiang uranium ore field. The results are as follows. The Changjiang biotite granite pluton was formed at 166~157 Ma (weighted average age: 160.9 Ma) during the Middle-Late Jurassic. The Youdong two-mica granite pluton was formed at 245.6~219.6 Ma (weighted average age: 232.1 Ma) during the Triassic. A variety of dykes such as gabbro diorites, hornblende diabases, fine-grained granitic rocks, and lamprophyres have developed in the study area. The dykes in the ore field can be divided into at least three categories according to their activity stages, namely Late Jurassic mafic dykes (150~145.1 Ma), Early Cretaceous acid dykes (138.6~123.9 Ma), and Early Cretaceous mafic dykes (110 Ma). The uranium mineralization of the Changjiang uranium ore field began during the Early Cretaceous and lasted until the Paleocene, showing a long time span ranging from 127 to 60 Ma. The uranium metallogenic periods include the Early Cretaceous metallogenic epoch (127~119 Ma), the Late Cretaceous metallogenic epoch (75~67 Ma), and the Paleocene metallogenic epoch (61~54 Ma). The age data are concentrated in the range of 70~60 Ma (Late Cretaceous-Paleocene), which might be the peak of uranium mineralization of the study area. The diagenesis and uranium mineralization of the Changjiang uranium ore field evolved in the order of Youdong pluton → Changjiang pluton → early mafic dykes → fine-grained granitic dykes → early uranium mineralization stage → fine-grained biotite granite dykes → late mafic dykes → second uranium mineralization stage → late uranium mineralization stage. There are six phases of diagenesis and uranium mineralization of the Changjiang uranium ore field, i.e., Triassic granitic magmatism (the Youdong pluton), Middle-Late Jurassic granitic magmatism (the Changjiang pluton), diagenesis of Late Jurassic mafic dykes (gabbro diorite dykes, 150 Ma; hornblende diabase dykes, 145 Ma), diagenesis of Early Cretaceous dykes and uranium mineralization (138.6~110 Ma), Late Cretaceous uranium mineralization (75~67 Ma), and Paleocene uranium mineralization (61~54 Ma). It is recommended that further studies should be conducted on the metallogenic chronology of uranium deposits, the geochronology of other dykes such as lamprophyres, and the uranium metallogenic mechanisms of deposits except for Mianhuakeng (302), Shulouqiu(305), and Changpai.
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