| 相山矿田南部浯漳花岗斑岩体年代学、地球化学及地质意义 |
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| 引用本文： | 刘龙,张树明,阮小语,张鑫,欧阳军勇,夏寅初,吴志春.相山矿田南部浯漳花岗斑岩体年代学、地球化学及地质意义[J].岩石学报,2020,36(6):1769-1786. |
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| 作者姓名： | 刘龙 张树明 阮小语 张鑫 欧阳军勇 夏寅初 吴志春 |
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| 作者单位： | 东华理工大学核资源与环境国家重点实验室, 南昌 330013;东华理工大学核资源与环境国家重点实验室, 南昌 330013;东华理工大学放射性地质与勘探技术国防重点学科实验室, 南昌 330013;东华理工大学核资源与环境国家重点实验室, 南昌 330013;安徽省地质环境监测总站, 合肥 230000 |
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| 基金项目： | 本文受国家自然科学基金项目(41862006、41802247)资助. |
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| 摘 要： | 相山矿田的铀矿床集中分布于相山北部和西部两个铀成矿带,其中北部花岗斑岩型铀矿床占资源总量的36. 55%。前人从年代学、地球化学、控矿因素与成矿模式等多方面对相山北部花岗斑岩做了不同程度的研究,但对于南部具有相同地质特征的花岗斑岩研究较为薄弱。近年来在相山南部相继发现浯漳、刁元、上南等众多铀矿点且见有一百多米的矿化段,表明其具有较大找矿前景。本文选择相山南部浯漳花岗斑岩开展野外地质调查、地球化学特征和LA-ICP-MS锆石U-Pb定年等的系统研究,在厘定地质特征和成岩年代的基础上,探讨其岩石类型、构造环境及物质来源。研究结果如下:(1)花岗斑岩LA-ICP-MS锆石U-Pb定年结果显示,~(206)Pb/~(238)U年龄加权平均值分别为135. 6±1. 6Ma(MSWD=0. 67,n=17)、135. 2±1. 5Ma(MSWD=0. 95,n=19),集中在134～136Ma之间,属于早白垩世时期;(2)花岗斑岩Sr含量为154×10~(-6)～261×10~(-6),Yb含量为2. 65×10~(-6)～3. 62×10~(-6),具有低Sr高Yb特征,属浙闽型(S型)花岗岩;(3)花岗斑岩属于燕山晚期后造山伸展拉张构造环境的产物;(4)花岗斑岩来自中元古代上地壳部分熔融,未有明显地幔物质参与;(5)对比相山北部产铀花岗斑岩规模、岩相、年代学、地球化学等特征,浯漳花岗斑岩具有产铀可能性,相山南部地区至今找矿未有突破,可能是缺乏深部勘查工程,从而导致隐伏矿体未被发现。
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| 关 键 词： | 花岗斑岩 锆石U-Pb定年 早白垩世 浙闽型（S型） 相山南部 |
| 收稿时间： | 2019/12/25 0:00:00 |
| 修稿时间： | 2020/3/20 0:00:00 |
Geochronology, geochemistry and the geological significance of Wuzhang granite porphyry in the southern Xiangshan orefield |
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| LIU Long,ZHANG ShuMing,RUAN XiaoYu,ZHANG Xin,OUYANG JunYong,XIA YinChu,WU ZhiChun.Geochronology, geochemistry and the geological significance of Wuzhang granite porphyry in the southern Xiangshan orefield[J].Acta Petrologica Sinica,2020,36(6):1769-1786. |
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| Authors: | LIU Long ZHANG ShuMing RUAN XiaoYu ZHANG Xin OUYANG JunYong XIA YinChu WU ZhiChun |
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| Institution: | State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology, Nanchang 330013, China;State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;Geological Environment Monitoring Station in Auhui Province, Hefei 230000, China |
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| Abstract: | Uranium deposits in Xiangshan uranium orefield are mainly distributed in the northern and western uranium metallogenic belts and granite-porphyry type uranium deposits in the north accounts for 36.55% of the total resources. Previous studies on granite porphyry in the north of Xiangshan have been done to different degrees from chronology, geochemistry, uranium-controlling factors and metallogenic models, but the studies on granite porphyry in the south of Xiangshan with the same geological characteristics are weak. In recent years, a large number of uranium occurrences have been found in the south of Xiangshan, such as Wuzhang, Diaoyuan, Shangnan as well as above 100 meters mineralized sections, showing the great prospecting prospects in this area. We selected the Wuzhang granite porphyry in the southern Xiangshan for field geological survey, geochemical characteristics and LA-ICP-MS zircon U-Pb dating. Based on the determination of geological characteristics and diagenetic age, the material source and tectonic environment were discussed. The results are as follows: (1) the U-Pb dating results of LA-ICP-MS zircons from granite porphyry show that the weighted average ages of 206Pb/238U are 135.6±1.6Ma (MSWD=0.67, n=17) and 135.2±1.5Ma (MSWD=0.95, n=19) respectively, which are concentrated between 134Ma and 136Ma, belonging to the Early Cretaceous Period; (2) granite porphyry is characterized with low Sr 154×10-6~261×10-6 and high Yb 2.65×10-6~3.62×10-6 and belongs to Zhemin-type (S-type) granite; (3) granite porphyry is the product of the post-orogenic extensional tensional tectonic environment; (4) granite porphyry originated from partial melting of Mesoproterozoic upper crust, and no obvious mantle material was involved; (5) compared with the characteristics of scale, lithofacies, chronology and geochemistry of uranium-producing granite porphyry in the north, Wuzhang granite porphyry has the possibility of uranium production. Possible reason for the failure in prospecting may be the lack of deep exploration engineering, which makes the hidden ore bodies undiscovered. |
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| Keywords: | Granite porphyry Zircon U-Pb dating Early Cretaceous Period Zhemin-type (S-type) granite Southern part of Xiangshan |
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