山东邹平火山岩地区铜矿床成矿流体的形成、演化及成矿  

Formation,evolution and mineralization of ore-forming fluid for copper deposit in Zouping volcanic area in Shandong

作　　者：刘苏明[1,2] 徐兆文[1,2] 陆现彩[1,2] 李海勇[1,2] 王浩[1,2] 杨小男[1,2] 赵增霞[1,2] 

机构地区：[1]内生金属矿床成矿机制研究国家重点实验室,江苏南京210093 [2]南京大学地球科学与工程学院,江苏南京210023

出　　处：《地质学刊》2013年第4期521-529,共9页Journal of Geology

基　　金：国家自然科学基金(41173050);高等学校博士点专项基金(2011009110043)联合资助

摘　　要：邹平地区与火山岩浆热液作用有关的铜矿床主要可划分为2种类型:一类为斑岩-火山角砾岩型,另一类为浅成低温热液型;代表性矿床分别为王家庄斑岩-火山角砾岩型铜(钼)矿床和南洞子浅成低温热液型铜(金)矿床。流体包裹体研究表明:王家庄铜(钼)矿床成矿流体的均一化温度和盐度偏高,出现了富气相的两相水溶液包裹体、富液相的两相水溶液包裹体和含子晶的三相水溶液包裹体共存现象,加温后,富气相包裹体均一到气相,同期富液相包裹体均一到液相的特征,这表明成矿流体在形成和演化过程中曾发生过沸腾作用。南洞子铜(金)矿床成矿流体均一温度和盐度偏低,以上3种包裹体共存的现象不明显,说明成矿流体在形成和演化过程中沸腾作用不强。上述2类矿床矿化脉石英中的δ18O H2O-δD投影点飘离岩浆水范围,参照流体包裹体研究结果,证明邹平地区与火山岩浆热液作用有关的铜矿成矿流体主要来源于岩浆水,后期混入大气降水。相比之下,浅成低温热液铜矿成矿流体中的大气降水混入量多。The copper deposits related with volcanic magmatic hydrothermal action in Zouping area could be divided into mainly two types, one was porphyry-breccia copper deposit, and the other was epithermal copper deposit. There were Wangjiazhuang porphyry- breccia copper （molybdenum） deposit and Nandongzi epithermal copper （gold） deposit as representative deposits. The fluid inclusion study demonstrated that the homogenization temperatures and salinity of primary fluid inclusions in the mineralized quartz veins of the Wangjiazhuang copper （molybdenum） deposit were higher, a phenomenon was observed that the vapor-rich inclusions, the liquid-rich inclusions and the three-phase inclusions containing daughter minerals coexisted, meanwhile, vapor-rich inclusions homogenized to a single vapor phase and liquid-rich ones homogenized to liquid phase, which indicated that the ore-forming fluid was once boiling during its formation and evolution. The homogenization temperatures and salinity of primary fluid inclusions in the mineralized quartz veins of the Nandongzi copper （gold） deposit were lower, a coexisted phenomenon was not observed for the vapor-rich inclusions, the liquid- rich inclusions and the three-phase inclusions containing daughter minerals, indicated that the fluid was not once boiling. The ~18 OH2o- （ D projection drop of primary fluid inclusions in the mineralized quartz veins of the copper deposits wafted away from the magmatic water limits at Zouping area. It was deduced that the ore-forming fluid was mainly derived from the magmatic fluid and mixed with meteoric wa- ter in the late stage. Much of the meteoric water mixed and strong water/rock reaction mixed into the Nandongzi copper （gold） deposit.

关 键 词：成矿流体 稳定同位素 形成与演化 铜矿 山东邹平 

分 类 号：P618.41[天文地球—矿床学]