相山矿田西部鹏姑山地段铀成矿地质特征及找矿潜力  

Geological characteristics and prospecting potential of uranium mineralization in Penggushan section of western Xiangshan ore field

作　　者：聂涛 NIE Tao(Research Institute No.270,CNNC,Nanchang 330200,China)

机构地区：[1]核工业二七〇研究所,江西南昌330200

出　　处：《世界核地质科学》2024年第4期681-692,共12页World Nuclear Geoscience

基　　金：中国核工业地质局项目(编号:202229-2)资助。

摘　　要：鹏姑山地段位于相山矿田西部,近年在该地段取得较好的找矿线索,为明确区内下一步找矿思路,通过详细的野外地质调查、岩矿心编录,采集代表性样品开展岩矿鉴定、电子探针及主微量元素分析等研究。结果表明:区内铀矿化严格受NE向邹—石断裂构造控制,矿体产于邹—石断裂旁侧次级裂隙带内,整体呈NE—NNE向展布,倾向NW,倾角介于50°~70°之间;区内热液蚀变可划分为成矿早-中-晚三期,其中赤铁矿化、绿泥石化和紫黑色萤石化是区内最直接找矿标志;矿石矿物主要为铀石、沥青铀矿,脉石矿物主要为赤铁矿、黄铁矿、毒砂、萤石和方解石等。岩矿石中与U元素呈明显正相关的主量元素为Fe_(2)O_(3)、P_(2)O_(5),呈明显负相关的主量元素为FeO、K_(2)O和Na_(2)O;围岩与矿石的稀土配分曲线相似,均呈明显右倾型,LREE富集,HREE亏损,轻重稀土分馏程度较大,强Eu负异常,微弱Ce异常。综上所述,鹏姑山地段矿体主要受NE向邹—石断裂构造控制,铀矿体主要赋存在邹—石断裂上盘次级裂隙带内,次级裂隙及两侧围岩发育明显的矿化蚀变,邹—石断裂带旁侧、平顶山断裂下盘是今后勘查的重点方向。Penggushan is located in the west of Xiangshan ore field.In recent years,good prospecting clues have been discovered in this area.In order to clarify the next step of prospecting in the area,detailed field geological survey and rock core catalog was carry out.At the same time,representative samples were collected,electron probe and analysis of major and trace elements,et al.were conducted.The research results show that uranium mineralization in this area is strictly controlled by the Zou-Shi fault structure in northeast direction.The ore body is located in the secondary fractures on the side of Zou-Shi fault,which strikes NE-to-NNE and dip NW with the angle of 50°~70°.The hydrothermal erosion in the area can be divided into three phases of early,middle and late mineralization,and the hematitization,chlorite and purple luorite are the most direct signs for ore prospecting.Ore minerals are mainly uranite,pitchblende,gangue minerals are mainly hematite,pyrite,arsenopyrite,fluorite,calcite and so on;the U content of ore and hosting rock samples is positively correlated with the content of Fe_(2)O_(3),P_(2)O_(5),and negatively correlated with the content of FeO,K_(2)O and Na_(2)O;the REE pattern of host rock and ore are similar,and both show ing obvious right-leaning type with LREE enrichment and HREE loss,large degree fractionation of LREE to HREE,strong negative Eu anomaly and weak Ce anomaly.In conclusion,the uranium orebody in Penggushan section is mainly controlled by the NE-trending Zou-Shi fault,stored in the the secondary fractures with obvious mineralization alteration in the both sides of hosting rocks.The next exploration should focused on the the both sides of Zou-Shi fault and the footwall of Pingdingshan faut.

关 键 词：鹏姑山 成矿地质特征 断裂构造 控矿因素 找矿潜力 

分 类 号：P619.14[天文地球—矿床学] P611[天文地球—地质学]