| 甘肃龙首山成矿带东段闪长玢岩锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 陈云杰,王刚,赵如意,杨昆,荣骁,李涛.甘肃龙首山成矿带东段闪长玢岩锆石U-Pb年龄及其地质意义[J].铀矿地质,2021(1):38-50,111. |
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| 作者姓名： | 陈云杰 王刚 赵如意 杨昆 荣骁 李涛 |
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| 作者单位： | 核工业二〇三研究所;东华理工大学核资源与环境国家重点实验室 |
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| 基金项目： | 中国核工业地质局项目(编号:201936-1)资助。 |
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| 摘 要： | 为了探讨龙首山成矿带东段与铀成矿关系密切的灰绿色闪长玢岩的成因、侵位时代及与铀成矿的关系,对其进行了锆石U-Pb年代学、岩石地球化学、成矿背景等分析。分析结果表明,岩石具有富铝、富碱、轻稀土元素相对富集和高场强元素亏损的地球化学特征,岩石类型属于准铝质钙碱性系列,其岩浆可能源于下地壳基性岩的部分熔融;闪长玢岩的U-Pb年龄为(422.3±3.6)Ma,结合其穿切的蚀变带的原岩花岗闪长岩的年龄,推测了研究区内的碱交代岩的形成时间为433~423 Ma。同时沿断裂分布的闪长玢岩脉为后期铀成矿提供了良好的地球化学障和成矿空间,在区内具有较好的找矿潜力;在龙首山东段地区寻找碱交代型铀矿化时,其可作为找矿标志之一。
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| 关 键 词： | 闪长玢岩 锆石U-PB年代学 地质意义 龙首山 |
Zircon U-Pb Age and Geological Significance of Diorite Porphyrite From East Longshoushan,Gansu |
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| CHEN Yunjie,WANG Gang,ZHAO Ruyi,YANG Kun,RONG Xiao,LI Tao.Zircon U-Pb Age and Geological Significance of Diorite Porphyrite From East Longshoushan,Gansu[J].Uranium Geology,2021(1):38-50,111. |
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| Authors: | CHEN Yunjie WANG Gang ZHAO Ruyi YANG Kun RONG Xiao LI Tao |
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| Institution: | (Research Institute NO.203,CNNC,Xianyang,Shanxi 712000,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang,Jiangxi 330013,China) |
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| Abstract: | Zircon U-Pb geochronology,petrochemistry of greyish green diorite porphyrite were used to discuss its genesis,emplacement age and relationship to the uranium metallogenic background in the eastern part of Longshoushan.The results showed that the rock is rich in aluminum,alkali and light rare earth elements and with the geochemical characteristics of high field strength element depletion.The rock belongs to the quasi aluminum high calc-alkaline series,and the source magma may be derived from the partial melting of the basic rocks in the lower crust.The age of the diorite porphyrite vein is(422.3±3.6)Ma.Considering the age of granodiorite penetrated by porphyrite vein,the formation of alkali metasomatite in the study area was inferred before 433~420 Ma.The diorite porphyrite vein distributed along the fault provided favorable geochemical barrier and metallogenic space for the later uranium mineralization.Therefore the diorite porphery vein filling fracture has good prospecting potential and can be used as one of the indicators in exploring deep alkali metasomatic uranium mineralization in the eastern part of Longshoushan. |
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| Keywords: | Longshoushan diorite porphyrite zircon U-Pb chronology geological significance |
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