江西相山CUSD3钻孔铀矿化蚀变带元素活动性探讨

江西相山CUSD3钻孔铀矿化蚀变带元素活动性探讨

刘军港;李子颖;黄志章;李秀珍;聂江涛

【期刊名称】《地质学报》

【年(卷),期】2017(091)004

【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Na2O、FeO、CaO、MnO、P2O5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;SiO2和K2O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,Fe2O3、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.%U mineralization section of CUSD 3 drilling core n Xiangshan of Jiangxi was selected as an objective in this study.Based on core observation and petrographic analysis,alteration zone was divided into five belts,which are center belt,lateral belt,nearside belt,distal belt and outside belt,hydrothermal alteration intensity of which decreases from inner to outside.The alteration types are mainly albitization,illitization,carbonation and apatization.The uranium content is

positive correlated to the contents of Na2 O,FeO,CaO,MnO,P2O5,which could be resulted from the albitization that superimposed on quartz and K-feldspar.MgO.And Fe2O3 contents reduce gradually from inner to outer alteration zones,which were probably related to chloritization of biotite and plagioclase on both sides of the alteration zones.The trace elements (such as Sr,Pb,Zn,Mo,W,Bi,Sb,Ta,Zr,and Hf) are positively correlated to U.The U content in the strong alteration zone is much bigger than that in weak alteration zone,indicating that the ore-forming fluid and material were derived from the depth but not from wall rocks.In addition,the total amount of REEs,δEu value,and positive correlation to U content in the alteration zones suggest deep source of the ore-forming fluids in origin.【总页数】17页(P896-912)

【作者】刘军港;李子颖;黄志章;李秀珍;聂江涛

【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,北京,100029;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,北京,100029;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,北京,100029;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,北京,100029;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,北京,100029

【正文语种】中文

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