胶东金矿区两种花岗岩之间熔融再生关系的实验研究  

EXPERIMENTAL STUDY ON THE MELTING- REGENERATION RELATIONSHIP BETWEEN TWO KINDS OF GRANITES IN JIAODONG GOLD ORE REGION

作　　者：曲晓明[1] 王鹤年[1] 饶冰[1] 

机构地区：[1]南京大学地球科学系

出　　处：《地球科学（中国地质大学学报）》1998年第1期55-58,共4页Earth Science-Journal of China University of Geosciences

基　　金：国家教委博士点基金;南京大学内生金属矿床成矿机制研究国家重点开放实验室基金

摘　　要：以玲珑片麻状花岗岩为初始物，采用纯水和Ｈ２Ｏ－ＣＯ２混合物（ｘ（Ｈ２Ｏ）＝０．７０）两种实验介质，在１．５×１０２ＭＰａ和不同温度下（７４０℃，７７０℃，８１０℃，８５０℃）进行部分熔融实验，验证了胶东金矿区与金矿密切相关的栾家河中粗粒花岗岩与玲珑片麻状花岗岩之间的熔融再生关系．结果表明，栾家河岩体是由玲珑岩体在８１０℃，１．５×１０２ＭＰａ，水不饱和（ｘ（Ｈ２Ｏ）＝０．７０）条件下经１８％的熔融形成的．实验结果与岩体中大量发育ＣＯ２包裹体的地质事实相符合，从熔体分离机制上阐明了两岩体之间的生成关系．Linglong gneissic granite as the initial material, a series of partially melting experiments were carried out under both pure water and H2O-CO2 mixture (x(H2O)=0.70) media at 1.5×102MPa and different temperatures (740℃, 770℃, 810℃, 850℃) to verify the melting-regeneration relationship between Luanjiahe granite closely associated with gold deposits and Linglong granite in Jiaodong gold ore region. The result indicates that Luanjiahe granite formed from the partial melting of Linglong granite with a melting degree of 18% under 810℃, 1.5×102MPa, and water-undersaturated (x(H2O)=0.70) conditions. The experimental result consistent with abundant occurrence of CO2-rich fluid inclusions in the granite and from the melt separation mechanism clarifies the genetic relationship between the two granites.

关 键 词：花岗岩 熔融实验 金矿床 再生关系 

分 类 号：P588.121[天文地球—岩石学] P618.510.2[天文地球—地质学]