江西相山CUSD3钻孔铀矿化蚀变带元素活动性探讨

发布时间：2018-04-24 11:08

本文选题：铀矿化 + 热液蚀变　；参考：《地质学报》2017年04期

【摘要】：本文以江西相山科学深钻CUSD3钻孔铀矿化段为研究对象,在详细岩心观察和岩相学研究的基础上,将其分为矿化中心带、近侧强蚀变带、旁侧中等蚀变带、远侧弱蚀变带和外侧微弱蚀变带,由内向外热液蚀变强度依次减弱。蚀变类型主要为钠长石化、绿泥石化、伊利石化、碳酸盐化和磷灰石化等。运用标准化Isocon图解法分析表明,U含量与蚀变岩中Na_2O、FeO、CaO、MnO、P_2O_5含量呈正相关,主要与钠长石化、伊利石化、碳酸盐化、磷灰石化有关,且成矿流体为碱性富P流体;SiO_2和K_2O含量与U含量呈相反迁移特征,主要为岩石中钠长石交代石英和钾长石所致;蚀变带中,Fe_2O_3、MgO含量向两侧逐渐降低,与两侧黑云母和斜长石的绿泥石化有关;微量元素Sr、Pb、Zn、Mo、W、Bi、Sb、Zr、Hf等与U呈正相关,结合各蚀变带中U元素含量较未蚀变新鲜岩石明显富集,表明成矿流体和物质并非来源于围岩。此外,蚀变带中稀土元素总量、δEu值、重稀土含量与U含量呈正相关,指示成矿流体可能为深部来源。
[Abstract]:In this paper, the CUSD3 borehole uranium mineralization section of Jiangxi Xiangshan scientific deep drilling is studied. On the basis of detailed core observation and petrographic study, it is divided into mineralized center zone, near lateral strong alteration zone, side medium alteration zone, distal weak alteration zone and lateral weak etch zone, and the internal and external hydrothermal alteration intensity decreases in turn. Alteration type is the main type. For sodium feldspar, green mud petrifaction, illite, carbonation and phosphorous fossilization, the standard Isocon graphic analysis shows that U content is positively related to Na_2O, FeO, CaO, MnO, P_2O_5 content in altered rocks, mainly related to sodium feldspar, illite, carbonation and phosphorization, and the ore-forming fluid is alkaline rich P fluid; SiO_2 and K_2O contain The content of Fe_2O_3 and U is mainly caused by the metasomatism of quartz and potash feldspar in the rock. In the alteration zone, the content of Fe_2O_3 and MgO gradually decreases to both sides of the two sides of biotite and plagioclase, and the trace elements are positively related to the contents of the elements in the alteration zones, such as Pb, Zn, Mo, W, Bi, Sb, Zr, and Hf. In addition, the total amount of rare earth elements, the value of delta Eu and the content of heavy rare earth are positively related to the content of U, indicating that the ore-forming fluid may be a deep source.

【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;
【基金】：中核集团“龙灿工程”相山深部三维成矿环境研究项目(LCD116)的成果
【分类号】：P619.14

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