| 相山牛头山地区铀矿床深部多金属成矿流体特征与成矿物质来源探讨 |
| Received:October 04, 2018 Revised:January 20, 2019 点此下载全文 |
| 引用本文：QIU LinFei,WU Di,WU Yu,JIN GuiShan,HAN Juan,LIU JunGang,GUO Juan.2019.Characteristics of ore-forming fluids and sources of polymetallic ore-forming materials in deep segment of uranium deposits in Niutoushan area, Xiangshan[J].Mineral Deposits,38(2):291~302 |
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| Author Name | Affiliation | | QIU LinFei | Beijing Research Institute of Uranium Geology, Beijing 100029, China | | WU Di | Beijing Research Institute of Uranium Geology, Beijing 100029, China | | WU Yu | Beijing Research Institute of Uranium Geology, Beijing 100029, China | | JIN GuiShan | Beijing Research Institute of Uranium Geology, Beijing 100029, China | | HAN Juan | Beijing Research Institute of Uranium Geology, Beijing 100029, China | | LIU JunGang | Beijing Research Institute of Uranium Geology, Beijing 100029, China | | GUO Juan | Beijing Research Institute of Uranium Geology, Beijing 100029, China |
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| 基金项目:国家重点研发计划"华南热液型铀矿基地深部探测技术示范（编号：2017YFC0602000）"项目资助 |
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| 中文摘要:最新的研究与钻探结果揭示，相山铀矿田深部蕴藏丰富的铜铅锌多金属矿产资源，矿田具有"上铀、下多金属"的资源空间展布样式，对这种新型矿床的形成机制迄今尚未得到阐明。文章在野外地质调查基础上，研究铀多金属矿石中矿物共生组合和流体包裹体特征，初步揭示了含矿流体的性质及其成矿机制。新的资料表明，铀矿化下部的多金属成矿作用可以划分为3期：第1期形成粒状石英-黄铁矿组合；第2期形成石英-闪锌矿-黄铜矿-方铅矿-毒砂-菱铁矿组合；第3期形成方铅矿-辉银矿-黝锡矿-方解石组合。对不同矿化期次脉石矿物中的流体包裹体进行观察鉴定、温度测试、激光拉曼成分分析及硫化物S同位素分析研究。结果表明，相山矿田多金属成矿流体早期为深部岩浆来源的富CO2流体，晚期为深部流体与大气降水混合物。成矿流体总体为中低温（120~300℃）、低盐度（w（NaCleq）=4%~8%）的热液流体。从早到晚，多金属成矿流体从中温、低盐度向低温、低盐度演化，浅部流体的混入造成的流体物理化学条件改变可能是Cu、Pb和Zn等成矿元素沉淀的主要机制。 |
| 中文关键词:地球化学 流体包裹体 成矿流体 来源 铀多金属 相山 |
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| Characteristics of ore-forming fluids and sources of polymetallic ore-forming materials in deep segment of uranium deposits in Niutoushan area, Xiangshan |
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| Abstract:The latest researches and drilling results show that the Xiangshan uranium ore field is rich in copper, lead and zinc polymetallic mineral resources. The Xiangshan ore field has an ore-forming spatial model of "polymetallic material in the lower part, uranium in the upper part". On the basis of field geological survey and according to the association characteristics of polymetallic ores, the authors divided the stages of ore-forming fluids of polymetallic ores which are under uranium mineralization. It is believed that there are three stages of mineralization in polymetallic mineralization. Stage 1 is granular quartz-pyrite combination, stage 2 is quartz-sphalerite-chalcopyrite-galena-arsenopyrite-siderite combination and stage 3 is galena-argyrite-calcite combination. Based on temperature test, Laser Raman composition analysis and sulfide S isotope study, the observation and identification of fluid inclusions in gangue minerals in different mineralization stages show that the polymetallic ore-forming fluids in Xiangshan ore field are of deep magma origin. CO2-rich fluid in the deep solution mixed with atmospheric precipitation fluid at the late stage. The ore-forming fluid is generally a medium-low temperature (120~300℃), low salinity(w(NaCleq)=4%~8%) hydrothermal fluid. From the early stage to the late stage of mineralization, the evolution is from medium temperature and low salinity to low temperature and low salinity. Gradually, the change of fluid physicochemical conditions caused by the mixing of shallow fluids may be the main mechanism for the precipitation of ore-forming elements such as Cu, Pb and Zn. |
| keywords:geochemistry fluid inclusion ore forming fluid source uranium-polymetallic Xiangshan |
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