滇西墨江金厂金矿床时空四维结构模型

TIME SPACE FOUR DIMENSIONAL FRAMEWORK OF THE JINGCHANG GOLD DEPOSIT IN MOJIANG COUNTY,WESTERY YUNNAN

对墨江金厂金矿关键性地质问题研究结果表明，矿区金厂韧性剪切带（ＳＺｊｃ）、ＮＷＷ向褶皱构造和金厂超镁铁岩体侵位构造是不同成矿期的控矿构造，金矿床有三种成因类型。

Based on a study of some key geological problems of the Jinchang gold deposit in Mojiang County,the authors have concluded that the Jinchang ducitle shear zone(Szjc),the NWW striking fold structure and the emplacement tectonics of the ultramafic rocks in Jinchang area make up ore forming structures,that there are three genetic types of orebodies corresponding to three different types and stages of mineralization,and that all mineralizations occurred before Triassic.During the formation of thermal spring siliceous rocks,thermal spring type gold mineralization took place and the thermal spring siliceous orebodies were formed in Lanshan area.When the Ailaoshan ancient oceanic plate collided with the Zhongmian continental plate regionally in Early Permian,EW thrusting ductile shear zone was developed in company with the formation of gold bearing ductile shear zone and gold bearing quartz veins which were distributed along foliations.Later,the ultramafic rocks in Jinchang area coolly intruded upward into the shallow metamorphic rocks,and partly swallowed the early strata tectonics and gold orebodies.In Late Permian,ore bearing siliceous fluids migrated from the depth upward along the fractural system developed in the process of “cool” intrusion of ultramafic rocks,and were emplaced in the core of the NWW striking folds of Jinchang area,finally forming the Au rich quartz veins and the mixed type orebodies.The time space relationship between the orebodies and the main ore controlling factors is the time space four dimensional framework of the Jinchang gold deposit.