谭头—大章断陷盆地边缘成矿条件探讨

Discussion of metallogenic condition in the margin of Tantou dazhang graben basin

研究区位于外方山隆断与熊耳山隆断过渡地段,具太古宇太华群结晶基底和中元古界熊耳群盖层双层结构,横跨熊耳山断隆区、谭头—大章断陷盆地、外方山断隆区等3个Ⅲ级大地构造单元,构成菱形构造格局的断陷盆地周边控盆断裂切穿了深部矿源层,且与火山机构连通、与其次级断裂或与之相交的其他方向断裂相互连通,易于岩浆侵入和流体运动,控矿条件组合优于其他地段,显示了成矿环境的优越性和独特性,围绕断陷盆地边缘,在熊耳群盖层至太华群基底不同深度距断陷盆地边缘不足6km范围内形成了环断陷盆地分布的一系列大中小型热液金矿床,盆地边缘成矿特征十分明显。

The working area, with two parts： the Archean Taihua Group as the basement and middle Proterozoic Xionger Group as the cover, is located in transition section form Waifangsban upwarping faulted region to Xiongershan upwarping faulted region, which bestrides three grade III tectonic units： Xiongershan upwarping faulted region, , Tantou dazhang graben basin and Waifangshan up- warping faulted region.. Basin - controlling faults, forming rhomhohedral structure framework, not only cut through the ore source bed, but also connect with volcanic apparatus and other subsidiary fractures, which provide channels for magma intrusion and fluid migration and are more favorable for mineralization than other area. . And along the margin of the basin, i. e. , not far than 6kin from the margin, there are many large, middle or small deposits. So this place is concluded as the target for further exploration.