【作者】 王志良； 毛景文； 杨建民； 张招崇； 张作衡；

【Author】 Wang Zhiliang Mao Jingwen Yang Jianmin Zhang ZhaochongZhang Zuoheng( 1) Institute of Mineral Deposits, CAGS, Beijing; 2) Institute of Geology, CAGS, Beijing)

【机构】 中国地质科学院矿床地质研究所； 中国地质科学院地质研究所；

【摘要】 在北祁连山西段发育有一系列具有同生沉积特征的铅锌矿床,大东沟铅锌矿床为其代表,它们均赋存在中元古界朱龙关群中,朱龙关群为一套富含铅锌等金属的矿源层;加里东晚期花岗质岩浆侵位所产生的热液循环系统不断地从朱龙关群地层中萃取Pb、Zn元素,成矿流体在有利的构造部位沉淀成矿.稀土元素地球化学行为表明铅锌矿石继承了围岩(地层)的稀土配分特征.更多还原

【Abstract】 A few lead-zinc deposits,characterized by syndeposition.had been discovered in the western part of the North Qilianshan Caledonian orogenic belt. They occur in the Mesoprotero-zoic Zhulongguan group which is a lead-zinc source bed. Dadonggou lead-zinc deposit is a representative of them. The hydrothermal circulation system,caused by intrusion of Late Caledonian granite magma,extracted ore-forming elements from Zhulongguan group constantly.Eventually ore-bearing hydrothermal solution moved to the favorable structural position and formed the lead-zinc deposit through precipitation.更多还原