西秦岭温泉斑岩型钼矿床地质特征及成因浅析  

GEOLOGY AND GENESIS OF WENQUAN PORPHYRY MOLYBDENUM DEPOSIT IN THE WEST QINLING AREA

作　　者：韩海涛[1] 刘继顺[1] 董新[1] 欧阳玉飞[1] 

机构地区：[1]中南大学地学与环境工程学院

出　　处：《地质与勘探》2008年第4期1-7,共7页Geology and Exploration

摘　　要：温泉钼矿位于甘肃省武山县温泉乡陈家大湾，大地构造位置属北秦岭加里东褶皱带西段，是2000年后发现并正在勘查的斑岩型钼矿床。含矿的温泉岩体为中浅成侵入杂岩体，从海西期到燕山期有四期10次侵入。主体相为印支期侵入的似斑状黑云母二长花岗岩，燕山期早期的花岗斑岩穿插于主体相中，花岗斑岩与矿化密切相关，矿（化）体产出于燕山期花岗斑岩和附近的围岩中。地表矿化呈脉状零星分散、不连续，品位低。共圈出矿（化）体40条，在地表下20～50m深处矿化连成一体，构成面型矿化。已经控制矿体范围近0．3km^2，南北长近800m，东西实际控制宽400m，控制厚度最大445m，最小37m。钼矿体主要由充填于各向原生节理、裂隙中的相互平行或网状含钼石英细脉组成，矿石矿物组合简单，围岩蚀变较弱。成矿物质来源于岩浆，成矿流体主要来源于岩浆混入了大气降水和地下水，Re—Os同位素模式年龄214±7．1Ma，属斑岩型钼矿床。Wenquan porphyry molybdenum deposit in Chenjiadawan village, Wenquan Town, Wushan County, Gansu Province, is located in the west of Caledonian folding belt in the north Qinling area, which was found after 2000 and has been keeping on prospecting. Ore - bearing rock masses are meso - hypabyssal complexes, which are intrusions of ten times during the Hercynian to Yanshanian periods. The main phase is the quasi-porphyritic biotite adamellite of the Indo - China period intrusion, which was penetrated by the earlier Yanshanian period granitic porphyry that is closely related to the mineralization. Molybdenum ore （mineralized） body is located in the Yanshanian granitic porphyry and in the nearby wallrocks. Little separating veins can be seen with discontinuity and lower - grade in the surface. 40 Mo ore （mineralized） bodies are delineated which joined together and formed a mineralized-surface under 20～50 meters of the earth surface. The controlled area is about 0.3km^2 with 800m long from south to north and factual 400m controlling width from east to west. Maximum controlling thickness is 445m and minimum is 37m. Main Mo orebodies are composed of parallel or network Mo - bear- ing quartz veins filling in primary joints and fractures. Ore minerals are simple and wallroek alterations are weak. Ore - forming materials came from magma, and ore-forming fluids are magmatic water mixed with meteoric and ground water. Re - Os isotopic dating gave model age of 214±7.1 Ma. The deposit belongs to porphyry - mesothermal ore filling Mo type.

关 键 词：地质特征 成因 温泉斑岩型钼矿 西秦岭 

分 类 号：P618.65[天文地球—矿床学]