LOCATING MECHANISM OF QUARTZ VEIN GOLD DEPOSITS IN RUSHAN, SHANDONG PROVINCE

According to the differences in ore-controlling structural systems and the characteristics of host rocks, textures and structures of ores an d mineral associations of ores, quartz vein-type gold deposits in the Rushan area can be divided into the Rushan and Tongling styles. Rushan style gold deposits, occurring in the Kunyushan complex, include Rush an, Tangjiagou and Tongxishan gold mines. They are distributed along f our NNE-trending and sinistral, compresso-shear faults with a right st epping array. A prominent characteristic of the gold mineralization is that the orebodies in neighbouring gold deposits distributed in a sin gle ore-controlling fault zone take opposite pitches. Study of the loc ating structures of the quartz vein gold deposits shows that the Rusha n-style gold deposits are characterized by NNE and NE zoning. Therefor e, the intersections of the NE direction of the known gold deposit and the neighbouring NNE-trending fault zones are favourable for looking for gold deposits, and the ends of the curving segments of sinistral a nd right-stepping faults are favourable for looking for large gold dep osits. Tongling-style gold deposits occur in the Sanfosan porphyritic monzonitic granite. Emplacement of gold deposits is controlled by arcu ate and radiate structures formed during the intrusion of the Sanfosha n porphyritic monzonitic granite; the radiate faults controlled the di stribution of orebodies and the arcuate faults controlled;the pitch of the orebodies.