【作者】 郭嘉；

【导师】 杨言辰； 李骞；

【作者基本信息】 吉林大学 ， 矿物学、岩石学、矿床学， 2009， 硕士

【摘要】 黑龙江省逊克县霍吉河钼矿床是近年来新发现和正在勘查的Mo矿床,矿床矿体产出于黑云母二长花岗岩岩体中,辉钼矿等金属矿物呈浸染状、细脉浸染状赋存于蚀变二长岩(局部过渡为花岗斑岩)中的含矿黑云母—钾长石化—石英带、云母—石英网脉带、硫化物细脉带内,总体属于重要的斑岩型矿床,矿床规模达到大型。本文从成矿地质背景分析入手,深入研究矿床地质特征、地球化学特征,准确厘定了成矿岩体的形成时代,确定了该Mo矿床的成因,建立成矿模式,研究成果对本地区的开展类似研究工作与钼找矿工作有重要指导意义。更多还原

【Abstract】 The HuoJiHe Mo deposit is located in the north of XiaoXingAnLing-ZhangGuangCaiLing metallogenic belt, which is discovered nearby years as a good-sized one.Indicating with field-lab integration research, The mineralizing of HuoJiHe Mo deposit is focused on the Yanshanian biotite monzonitic granite,which putting up local mineralizing in this rock.The ore veins are controled of hydrothermal altered rock belt,and molybdenum ores major in the mineralized biotite- K-feldspar - quartz belt, granite- quartz network belt or sulfid joint vein belt.Showing the results of petrochemistry, microelement geochemistry and REE geochemistry research, the biotite monzonitic granite is the melting production of thickening the lower rock of crust ,which is related to mineralizing, have near affinity with adakites,and the same to the characteristic of high potass。So mantle-resource melts offer the ore-forming element in the original magma,just as Mo element。Indicating with fluid inclusion research,the mineralized fluid is belong to NaCl-H2O system。In the front of mineralization,the fluid has high-temperature and high-salinity characteres,and stand by the events of forepart magma evolvement.In metallogenic epoch,the fluid is style of medium-lower temperature and medium-lower salinity.The primary homogenization temperature of mineralized fluid of this deposit focus on the zone between 185.3 to 360℃,and the peak value is between 245.3 to 360℃.Based on the homogenization temperature and salinity of fluid inclusion,we can see that the fluid density is between 0.66 g/cm3 to 0.87 g/cm3, the mineralized pressure is between 38Mp to 85Mp,compared with the mineralized depth is between 4.9Km to 7.5km。In the zone of homogenization temperature,there are two different fluids of medium salinity style and lower salinity style,and it indicated the mixing action occurring at fluid evolvement in a certain extent。Indicating with the results of fine chronology research, the forming era of biotite monzonitic granite is 184.92±0.91Ma, which is related to mineralizing.So the granite is near related to the Mesozoic Yanshanian strcture-magma movement ,compared to early-Paleozoic Caledonian, which is considered by father workers. With the colligated researches, the form of HuoJiHe Mo deposit is related to the XiaoXingAnLing-ZhangGuangCaiLing orogeny in Mesozoic.When the movement makes the lithosphere thick, the magma usually comes of neonatal thick lower crust, remaining garnet and hornblende, finally forms as adakitic magma。And then with the extending circumstance,which is worked by subduction of Pacific Plate,the magmas intrude into the 4.9-7.5Km zone and finally deposit ores,and then form the low-F porphyry-vein style Mo deposit,which absent ore fluorite.更多还原