珲春-汪清地区成矿地质条件及找矿方向

METALLOGENIC GEOLOGICAL CONDITION AND PROSPECTING GUIDE IN HUNCHUN WANGQING AREA

吉林珲春－汪清地区已发现的有色金属、贵金属、稀有金属、放射性金属和黑色金属矿产计１１种．这些矿产与下古生界五道沟群地层，中生代火山岩系，华力西—燕山期中酸性侵入岩、次火山岩，东西向。

Hunchun Wangqing area,located in the east of Yanbian,is one of the most important producer of gold and polymetallic ores in Jilin Province Eleven kinds of non ferrours,precious,rare and ferrous metal minerals (involving Cu,Pb,Zn,W,Mo,Ni,U,Nb,Ta,Au and Fe,of which Au and Cu are dominant)have been found in the area,where there are 147 metallic mineral occurrences,including 2 large,5 middle,12 small scale deposits and 128 prospects The genesis of the deposits covers magmatic type,pegmatitic type,magmatic hydrothermal type,metamorphic hydrothermal type,magmatic metamorphic hydrothermal type,skarn type,subvolcanic hydrothermal type,volcanic rock type and mechanical sedimentary type Based on the relations between metallic mineralization and structure,stratigraphy,magmatic activities and magmatic origin,the favorable areas for exploring are as follows: 1)Mesozoic volcanic rocks developed areas are favorable for Au;Permian Kedao formation for Cu;Miaoling formation and Wudaogou group for Pb,Zn and Au 2)The contact zones between Variscan magmatite and Lower Paleozoic Wudaogou group and Permian strata are favorable for magmatic hydrothermal type gold deposits 3)The areas where are developed Yanshanian diorite,quartz diorite,diorite porphyrite and granite porphyry are favorable for gold deposits 4)The intersections of E W and S N trending structures are spacially favorable for mineralization 5)Where placer gold is developed,primary gold is expected The target areas are:(1)the margin of the E W trending volcanic basin in Wangqing Duhuangzi for volcanic rock type gold deposits,(2)Mijiang Madida area for subvolcanic hydrothermal Au Cu deposits related to hypabyssal stocks;and (3)S N trending Tazigou Dabeicheng ore belt for magmatic metamorphic hydrothermal type Au Cu deposits