河南嵩县钾长石石英脉型钼矿成矿流体地球化学  

Ore-forming Fluid Geochemistry of the K-feldspar Quartz-vein-typed Molybdenum Deposit in Songxian County,Henan Province

作　　者：白凤军[1,2] 赵太平[3] 肖荣阁[1] 刘国营[1,4] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]河南省有色金属地质勘查总院,河南郑州450052 [3]中国科学院广州地球化学研究所成矿动力学重点实验室,广东广州510640 [4]河南省有色金属地矿局五大队,河南郑州450016

出　　处：《现代地质》2010年第1期26-33,共8页Geoscience

基　　金：河南省国土资源厅"东秦岭(河南段)钼矿床类型及评价标志"(豫财建[2007]262)

摘　　要：河南嵩县纸房钼矿是在中元古界火山岩中顺层产出的钾长石英脉型钼矿,矿化石英脉呈似层状、透镜状密集平行排列,厚0.35～5.0 m,与围岩整合产出。矿化石英脉可以划分为3期,早期无矿石英脉呈致密块状,中期石英脉是钼矿化石英脉,晚期属于无矿化石英-碳酸盐细脉。地球化学研究显示成矿物质主要来自火山热液,成矿年龄与熊耳期火山喷发期后的时间一致。成矿流体成分、液相成分特征值及氢氧同位素分析表明,成矿流体属于在高温地质作用条件下形成中高温混合流体,流体包裹体显示为中高温热液沸腾和不混溶成矿,成矿压力为28×10^5～68×10^5Pa,属于低压浅成火山机构热液充填成矿。Zhifang molybdenum deposit in Songxian County of Henan Province is a K-feldspar quartz-vein-typed deposit occurring along the strata of Middle Proterozoic volcanic rock.The stratiform-like and lenticular mineralized quartz veins,with a thickness ranging from 0.35 to 5.0 m,appear parallel and dense and have a conformable contact with enclosing rocks.The mineralized quartz veins can be classified into three stages.The early stage quartz veins without ore is compact and massive.The quartz veins of middle stage are molybdenum mineralized while the quartz veins of late stage are small veins containing quartz and carbonate but no ore.Geochemical study shows that the ore-forming material comes mainly from volcanic hydrothermal fluid and ore-forming time is consistent with that of late Xiong＇er volcanic eruption stage.Ore-forming fluid compositions,eigenvalue of liquid-facies components,and H and O isotopes show that the mixed fluid of medium and high temperature results from high-temperatured geological action.Fluid inclusions show that ore-formation results from the interaction of immiscible fluid and ebullition of hydrothermal fluid.The metallogenic pressure is 28×10^5 to 68×10^5 Pa,suggesting that ore-formation results from the packing of hydrothermal fluid into volcanic edifice under low pressure and epithermal condition.

关 键 词：嵩县 熊耳群 钾长石石英脉 流体包裹体 

分 类 号：P618.65[天文地球—矿床学]