一条值得重视的跨国境成矿带——南戈壁—东乌旗铜多金属成矿带

A NOTABLE METALLOGENIC BELT STRIDING ACROSS THE BORDER BETWEEN CHINA AND MONGOLIA——SOUTH GOBI-DONGWUQI COPPER-POLYMETALLIC METALLOGENIC BELT

南戈壁—东乌旗铜多金属成矿带位于中蒙边境东段 ,呈北东东—北东向展布 ,处于古亚洲成矿域北部、古生代蒙古弧形构造带的东段。成矿带内主要出露古生界海相、浅海相碎屑岩、中基性火山岩夹碳酸盐岩建造及晚古生代中酸性 -酸性岩体。在成矿带西段蒙古南戈壁 ,已发现形成于晚古生代的察干苏布尔加和欧玉陶勒盖大型斑岩型铜金钼矿床。通过分析对比认为 ,该成矿带东段中国二连—东乌旗与西段蒙古南戈壁区域成矿地质背景相近 ,铜多金属具有成矿远景。近年 1∶2 0万区域化探普查和异常查证成果进一步表明二连—东乌旗地区含铜多金属矿具有找矿潜力。

South Gobi—Dongwuqi copper-polymetallic metallogenic belt striking NEE-NE is located in the east of border between China and Mongolia, and in the north of Palaeo-Asian metallogenic domain and in the east of Palaeozoic Mongolia arc structure. The Mongolia arc structure is mainly consisted of Palaeozoic Erathem shallow marine, marine facies clastic rock formation, volcanic formation, carbonate rock formation, and the Late Palaeozoic intermediate-acidity intrusive body. In the west of metallogenic belt in South Gobi of Mongolia, two large-size porphyry Cu-(Au-Mo) deposits, Tsagaan Suvarga and Oyu Tolgoi, have been discovered, which were formed in the period of the Late Palaeozoic. In the east of metallogenic belt in Erlian—Dongwuqi in China, the regional geological settings are similar to those in South Gobi of Mongolia, so the copper-polymetal mineralization is prospective in this region.