1. Inner Mongolia Mining (Group) Co�� Ltd��Hohhot 010051��China; 2. College of Earth Sciences��Jilin University��Changchun 130061��China; 3. The Fourth Geological Survey of Jilin Province��Tonghua 134001��Jilin��China

Dongzi Pb-Zn deposit��located in overlapping area between the northern margin of North China Plate metallogenic belt and the southern section of Great Hinggan Mountains metallogenic belt��is mainly controlled by EW trending faults and belongs to epi- mesotherma vein- type deposits�� The mainly ore- controlling fault F 1��1 re presents compressive characters in premineralizing stage and sinistral tensile characters in mineralizing stage�� The mineralization is rich in the location where the occurrence changes steeply and trending towards north�� Granite- por- phyry bodies in early Yanshan epoch��closely related to the spatial distribution of ore bodies��provided thermal power and ore-bearing hydrothermal solution for mineralization�� The δ 34 S CDT of galena and pyrite in ore are ��4. 8 × 10 ^��3 ��1. 4 ×10 ^��3 ��similar to the meteorite value��showing sulfur mainly derived from magma�� The surrounding rock andesite��diorite��granodiorite��granite porphyry with a high content of lead and zinc may provide the main ore- forming materials�� According to the mineral assemblages varying characteristics in space��we speculate that ore- bearing hydrothermal solution migrated from the western deep section to the eastern shallow section within the mining area�� Granite porphyry bodies��honeycomb siliceous fracture zones from the surface layer and ferromanga- nese caps can be the direct prospecting indicators in this area��