额尔古纳造山带构造演化与成矿作用

TECTONIC EVOLUTION AND METALLIZATION OF THE ERGUNA OROGENIC BELT

额尔古纳造山带属加里东期造山带。因该造山带发育了一系列燕山期铜多金属矿床，并且它位于著名的得尔布干深断裂带的西北侧，故也称为得尔布干成矿带。额尔古纳造山带属西伯利亚板块东南缘加里东期陆缘增生带。形成之后又经历了多期构造运动的改造，特别是燕山期沿得尔布干等北东向深断裂发生了大陆裂谷作用和强烈构造岩浆活动，使之最终形成了一系列不同类型的铜钼矿床和银多金属矿床。这些矿床在空间上构成“三层楼”结构。本文阐明了额尔古纳造山带成矿作用的重要地质因素，表明成矿作用是多期复杂地质构造作用的综合结果。

The Erguna orogenic belt belongs to Caledonides. A series of copper polymetallic deposits occuring in Yanshanian are located in the northwest side of the Derbugan deepseated fault of the orogenic belt so it is called Derbugan metallogenic belt. Erguna orogenic belt belongs to Caledonian epicontinental accretional belt in the southeast margin of the Siberia plate. Then, the belt suffered transformation resulted from multiphase tectonic activity, especially continental rifting, and strong tectonomagmatic activation took place along the deepseated faults striking NE, such as Derbugan deepseated fault, and finally resulted in formation of coppermolybdenum and silver polymetallic deposits. These deposits were formed in favorable structure position of different depths in the upper crust, resembling a building of three storeys. Important metallogenetic factors of the Erguna orogenic belt are discussed in the paper, which indicates that metallogenetion is related to multiphase complex tectonic activity.