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延边东北部地区中生代陆相火山断陷盆地处于吉黑褶皱系延边优地槽褶皱带延边复向斜内 ;区内中生代以来不同方向的断裂发育 ,火山活动强烈 ,岩浆侵入频繁 ;与中生代火山 -岩浆活动有成因联系的金、铜金金属矿床多处 ,矿化蚀变线索也较多 ,构成了著名的五凤 -小西南岔近东西向火山 -岩浆期后低温热液型金、铜多金属成矿带 ;区内中生代火山 -岩浆岩的形成是太平洋板块俯冲作用使大陆边缘拉张活动不断加剧 ,造成上地幔岩浆上侵的结果 ;并伴有成矿作用的发生 ,在岩浆岩体内外接触带的有利部位形成金、金铜或铜金多金属矿床 ;从远源至近源的成矿分带为Au- Ag→ Au- Cu- Ag→ Cu- Au- Pb- Zn→ Cu (- Mo- Au) ;成矿作用表现出从低温至高温、从低硫到高硫的变化 .
The Mesozoic continental facies volcanic fault basin in the northeastern Yanbian area is within the Yanbian complex syncline of the Yanbian Youdefang fold belt in the northeastern Yanbian area. Since the Mesozoic, the faults in different directions have been developed, the volcanic activity is intense and the magma invaded frequently. There are many gold and copper-gold-gold deposits and magmatic alteration clues that are related to magmatism. These clumps constitute the famous low-temperature hydrothermal gold and copper after the Wudong-Xiaoxinancha near-east-west volcano-magmatic period Metallogenic belt. The formation of Mesozoic volcanic-magmatic rocks in the area is the consequence of Pacific Plate tectonic subduction that aggravates the tension on the continental margin and causes upper mantle magma to invade. It is accompanied by the mineralization, Gold and gold copper or copper-gold polymetallic deposits are formed in the favorable locations of the inner and outer contact zones. The metallogenic belts from far to near source are Au- Ag → Au- Cu- Ag → Cu- Au- Pb- Zn → Cu (- Mo-Au). The mineralization shows a change from low to high sulfur from low temperature to high temperature.