辽南某些金矿床的流体包裹体研究

辽南猫岭、黄家营子和金厂沟金矿的含矿流体为H₂O-NaCl-CO₂体系。流体包裹体的爆裂温度曲线的爆峰次数与含金石英脉的金含量呈正相关关系，猫岭金矿流体包裹体的气相成分随着成矿作用的进行，其CO、CH₄、CO₂、N₂、O₂、H₂的摩尔百分数有所降低，而H₂O则有所增高。流体包裹体的CO₂/H₂O比值与含金石英脉的金含量呈正相关关系，而其离子成分的SO₄^2-/Cl^-比值与石英脉金含量呈反相关关系，研究表明，猫岭金矿和黄家营子金矿为岩浆热液与地下水混合热液成矿。矿液从猫岭金矿向黄家营子金矿方向流动，这两个金矿的成矿流体为低盐度、酸性、强还原环境。金厂沟金矿的成矿热液亦为岩浆热液和地下水混合热液。其成矿流体亦为低盐度、强酸性、强氧化环境。

HYDROTHERMAL ORE-FORMING SOLUTION OF SOME GOLD DEPOSITS IN SOUTHERN LIAONING STUDIED WITH FLUID INCLUSION

Maoling gold deposit occurs in the second member of the Gaixian Formation of Protero-zozic Liaohe group. In the mining area there is Indosinian porphyritic-ike granite. The Mi-neralization of the Maoling gold deposit can be divided into four stages. Inclusions are present in mineralization stage I and I as primary two phase inclusions about -4μm in size. In Maoling gold deposit metallogenetic temperature and pressure ranges respectively from 327° to 513℃ and 512×105 to 1234×105 Pa in the stage I ,from 325°to 407℃ and from 668×105 to 1322×105Pa in the stage I . The metallogenetic temperature in Huangjiayingzhi gold de-posit 0. 8km east to Maoling gold deposit ranges from 325°to 407℃,and the pressure from 782×105to 1302×105Pa. The ore fluid of the Maoling gold deposit and the Huangjiayingzhi gold deposit is regarded to be of H2O -NaCl -CO2 system. The Jinchanggou gold deposit oc-curs in the contact zone of the first member of the Gaixian Formation of Liaohe group with a porphyritic -like granite. The mineralization can be divided into three stages. The gold min-eralization is dominantly in stage I . Its primary fluid inclusion consists mainly of two -phase inclusion and three -phase gas,H2O and liquid COt inclusion. The two sorts of inclu-sion are about 5 to 6fμm in size. The metallogenetic temperature ranges from 325 -335℃ and the pressre from 1080×105to 1360× 105Pa. The ore fluid is of H2O-NaCl-CO2 system. The amount of peaks of decrepitation temperature curve of the fluid inclusions is in positive corre-lation with Au content of gold quartz vein. Molarity of gas components CO,CH4,CO2,N2,O2, H2 of the fluid inclusions in the Maoling gold deposit is reducing with mineralization evolu-tion. CO2/H2O value of fluid is in positive correlation with and SO42-/Cl- value of fluid inclu-sions is negative correlation with Au content of gold quartz vein. We could deduce from the content of K+ ,Na+ and Ca2+ ,the value of SO42-/C1- and C1-/F- ratio,and geological setting that the ore fluid is composed mainly of magmatic water mixed with groundwater and that it is of low salinity,low acidity arid strong reduction environment in the Maoling and Huangji-ayinzi gold deposits,and low salinity,high acidity and strong oxidation environment in Jin- changgou gold deposit.