| 相山铀矿田铀多金属成矿时代与成矿热历史 |
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| 引用本文： | 林锦荣,胡志华,王勇剑,张松,陶意.相山铀矿田铀多金属成矿时代与成矿热历史[J].岩石学报,2019,35(9):2801-2816. |
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| 作者姓名： | 林锦荣 胡志华 王勇剑 张松 陶意 |
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| 作者单位： | 核工业北京地质研究院, 中核集团铀资源勘查与评价技术重点实验室, 北京 100029,核工业北京地质研究院, 中核集团铀资源勘查与评价技术重点实验室, 北京 100029,核工业北京地质研究院, 中核集团铀资源勘查与评价技术重点实验室, 北京 100029,核工业北京地质研究院, 中核集团铀资源勘查与评价技术重点实验室, 北京 100029,核工业北京地质研究院, 中核集团铀资源勘查与评价技术重点实验室, 北京 100029 |
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| 基金项目： | 本文受国家自然科学基金项目（41573051）和国家重点研发计划项目（2017YFC0602600）联合资助. |
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| 摘 要： | 相山铀矿田的铀多金属矿化主要可划分为碱性铀矿化、酸性铀矿化、铅锌银铜矿化和金矿化四种类型。通过沥青铀矿和矿化岩石U-Pb等时线、黄铁矿Rb-Sr等时线、绢云母~(40)Ar-~(39)Ar同位素年龄测定,结合铀多金属成矿特征研究,厘定了相山铀矿田铀多金属成矿时代,确定铀多金属矿化的成矿时序为:碱性铀矿化、铅锌银铜矿化、金矿化、酸性铀矿化。锆石裂变径迹研究表明,相山矿田铀多金属矿化样品的锆石裂变径迹峰值年龄与U-Pb、Rb-Sr和~(40)Ar-~(39)Ar同位素年龄一致性良好,裂变径迹年龄(峰值年龄)可以限定热液铀多金属成矿热事件时代。碱性铀成矿热事件的锆石裂变径迹峰值年龄为119. 8～125. 6Ma;金成矿热事件和铅锌银铜多金属成矿热事件的锆石裂变径迹峰值年龄为106. 1～113. 8Ma;酸性铀成矿热事件的锆石裂变径迹峰值年龄为86. 7～100. 0Ma;新发现一期锆石裂变径迹峰值年龄为66. 4～78. 6Ma的热事件,该期热事件可能为相山矿田最晚一期酸性铀成矿热事件。相山矿田66. 4～78. 6Ma的铀成矿热事件,与华南花岗岩型热液铀矿床的区域成矿热事件时代耦合,该发现对华南火山岩型铀矿成矿时代的重新认识,对火山岩型、花岗岩型铀矿床成矿统一性认识具有重要意义。
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| 关 键 词： | 铀多金属矿化 裂变径迹 成矿时代 相山矿田 |
| 收稿时间： | 2019/3/20 0:00:00 |
| 修稿时间： | 2019/7/3 0:00:00 |
Ore-forming age and thermal history of uranium-polymetallic mineralization in Xiangshan uranium orefield |
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| LIN JinRong,HU ZhiHu,WANG YongJian,ZHANG Song and TAO Yi.Ore-forming age and thermal history of uranium-polymetallic mineralization in Xiangshan uranium orefield[J].Acta Petrologica Sinica,2019,35(9):2801-2816. |
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| Authors: | LIN JinRong HU ZhiHu WANG YongJian ZHANG Song and TAO Yi |
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| Institution: | Beijing Research Institute of Uranium Geology, CNNC Key Laboratory of Uranium Resource Exploration and Evaluation Technology, Beijing 100029, China,Beijing Research Institute of Uranium Geology, CNNC Key Laboratory of Uranium Resource Exploration and Evaluation Technology, Beijing 100029, China,Beijing Research Institute of Uranium Geology, CNNC Key Laboratory of Uranium Resource Exploration and Evaluation Technology, Beijing 100029, China,Beijing Research Institute of Uranium Geology, CNNC Key Laboratory of Uranium Resource Exploration and Evaluation Technology, Beijing 100029, China and Beijing Research Institute of Uranium Geology, CNNC Key Laboratory of Uranium Resource Exploration and Evaluation Technology, Beijing 100029, China |
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| Abstract: | The uranium polymetallic mineralization in Xiangshan orefield could be divided into four types:alkaline uranium mineralization, acidic uranium mineralization, lead-zinc-silver-copper mineralization as well as gold mineralization. Throughout pitchblende and mineralized rock U-Pb, pyrite Rb-Sr and sericite 40Ar-39Ar isotopic age determination as well as mineralization characteristics, we determined the forming sequence of uranium-polymetallic process in Xiangshan orefield:alkaline uranium mineralizaiton, lead-zinc-silver-copper mineralizaiton, gold mineralization and acidic uranium mineralization, respectively. The fission track thermal study showed that the peak ages of zircon fission track using uranium-polymetallic mineralized samples in Xiangshan orefield are well consistent with U-Pb, Rb-Sr and 40Ar-39Ar isotopic ages, which indicate that fission track age (mainly referred to peak ages) can be used to limit the forming age of hydrothermal uranium-polymetallic events. The zircon fission track peak ages of alkaline uranium mineralization event range from 119.8Ma to 125.6Ma; the zircon fission track peak ages of thermal gold mineralization event and lead-zinc-silver-copper mineralization event range from 106.1Ma to 113.8Ma; the zircon fission track peak ages of acidic uranium mineralization event range from 86.7Ma to 100.0Ma. There is another group of peak ages concentrated at 66.4~78.6Ma which may reflect a new discovered acidic uranium mineralization event in Xiangshan orefield. The ore-forming thermal event formed at 66.4~78.6Ma in Xiangshan orefield is well consistent with the metallogenic event of the granite-type uranium deposit in South China. This study make us further understand the ore-forming ages of volcanic-type uranium deposits and the metallogenic uniformity of volcanic-type and granite-type uranium deposits in South China. |
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| Keywords: | Uranium polymetallic mineralization Fission track Metallogenic epoch Xiangshan uranium orefield |
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