黑龙江省多宝山矿集区基底残块的发现及大地构造意义

Discovery and Geotectonic Significance of Basement Debris in Duobaoshan Ore-Gathering Area, Heilongjiang Province

摘要: 资料研究显示，黑龙江省多宝山矿集区中晚寒武世至早中三叠世处于古亚洲洋巨型开合旋回，期间发育北西向、北东向多次叠加复合造山岩系及活动陆缘铜钼金银有色–贵金属成矿组合。早前寒武纪以来同位素测年数据等证据显示，在上述显生宙复合造山带中，还存在着前寒武纪基底残块，可能指示前寒武纪更古老大洋的巨型开合过程。综合分析认为，多宝山矿集区基底残块的发现，对黑龙江省北西部区域地质构造演化及前寒武纪成矿作用研究有重要的大地构造意义。

Abstract: Data studies show that, Duobaoshan ore accumulation area of Heilongjiang province from Middle and late Cambrian to early middle Triassic is located in the giant open-and-close cycle of ancient Asia ocean. During this period, there were multiple superimposed composite orogenic series and active continental margin copper-molybdenum-gold-nonferrous metal metallogenic assemblages in NW and NE. Evidence from early Precambrian isotopic dating suggests that, in the above phanerozoic complex orogenic belts, there are Precambrian basement fragments. It may indicate the giant opening and closing of an older Precambrian ocean. Based on the comprehensive analysis, it is concluded that the discovery of basement fragments in Duobaoshan ore-concentrated area is of great tectonic significance to the study of regional geological structure evolution and Precambrian mineralization in the north and west of Heilongjiang province.