| 黔东注溪黑色岩系地球化学特征及矿化富集规律 |
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| 引用本文： | 刘文,李欢,陈正山,冯运富,季国松,田永红.黔东注溪黑色岩系地球化学特征及矿化富集规律[J].地球科学,2019,44(9):2978-2994. |
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| 作者姓名： | 刘文 李欢 陈正山 冯运富 季国松 田永红 |
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| 作者单位： | 1.贵州省地质矿产勘查开发局 117 地质大队, 贵州贵阳 550018 |
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| 基金项目： | 贵州省地质矿产勘查开发局项目SDK2010-2 |
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| 摘 要： | 目前急需分析黔东注溪钒矿形成的环境、成矿的物质来源以及矿化富集规律，指导实际地质勘查工作.系统研究了注溪矿区内中洞、老屋基和坪哨3个典型岩性剖面中黑色岩含矿岩系及矿层的全岩主微量元素组成.结果表明，含矿岩系具有较高的SiO2、MnO、Ce/Ce*和Eu/Eu*值，而矿层则含相对较高的Al2O3、Fe2O3、TiO2、CaO、Na2O、K2O、P2O5、V2O5、REE、As、Cu、Pb、Zn、Mo、Ni、Ti、Cr、Rb、Sr、Th、U和V.含矿岩系与矿层的主微量地球化学特征显示注溪钒矿床的成矿物源具有一定程度陆源物质的输入，且在成矿阶段受到了热水作用及生物作用的影响.另外，由南至北各剖面的热水成矿作用逐渐减弱；含矿岩系及矿层沉积环境均属缺氧环境，其中坪哨剖面的矿层沉积环境的缺氧程度要高于其他剖面.因此，注溪钒矿床钒富集成矿主要受古环境的还原条件和热液活动的影响，其中还原环境对钒元素的富集成矿起主要作用.据此推测坪哨剖面矿层形成时的海水深度应最深，北矿段中洞剖面的最浅；喷流热水带来的V等大量多金属元素在喷口及其附近大规模成矿.
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| 关 键 词： | 钒多金属层 矿化富集模式 成矿物质来源 沉积环境 黑色页岩 地球化学 |
| 收稿时间： | 2019-02-16 |
Geochemical Characteristics and Metal Enrichment Rules of Black Shales in the Zhuxi Vanadium Ore Field,Eastern Guizhou |
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| Abstract: | There is an urgent need to analyze the forming environment,the metal enrichment process and ore-forming rules of the Zhuxi vanadium ore field in eastern Guizhou Province. This paper systematically studies the major and trace element compositions of ore-bearing rocks and ore strata from three typical black shale sections in the ore field. The results show that ore-bearing rocks contain high contents/values of SiO2,MnO,Ce/Ce* and Eu/Eu*,while ore strata have higher concentrations of Al2O3,Fe2O3,TiO2,CaO,Na2O,K2O,P2O5,V2O5,REE,As,Cu,Pb,Zn,Mo,Ni,Ti,Cr,Rb,Sr,Th,U and V. The major and trace element geochemical characteristics of ore-bearing rocks and ores indicate that the ore-forming source of the Zhuxi vanadium ore field had a certain degree of continental material input,whilst both hydrothermal and biological processes played a significant role during the ore-forming process. In addition,the intensities of hydrothermal process decreased from southern to northern sections and the sedimentary environment of both ore-bearing rocks and ores was anoxic. The ores from the Pingshao lithological sections were formed in the most reducing environment than those from other sections. Therefore,the V enrichment and mineralization in the Zhuxi ore field has mainly been controlled by reducing paleoenvironment and hydrothermal activity,and the reducing environment has been more significant for V mineralization. It can be inferred that ores from the Pingshao section should have been deposited in the deepest seawater environment while the ores from northern Zhongdong section had the shallowest seawater level. Exhalative fluid brought abundant V and other metal elements depositing in the vent and adjacent areas,leading to the large-scale mineralization. |
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