黔东南重磁异常与金异常特征及找矿意义

为了深入挖掘黔东南地区的找矿潜力,对黔东南地区区域重磁异常进行解释,研究东部地区的天锦黎金矿密集区及西部地区的金化探异常分布特征,发现金矿床(点)和金化探(元素、块体)异常的产出,同重、磁异常平面分布和推断的岩浆岩侵入体(基性岩类、酸性岩、构造蚀变岩)及区域性深大断裂构造(东西向、南北向)的分布,存在着空间、时间和成因上的联系,由此拓开了黔东南天锦黎金矿密集区及外围金矿地质找矿的新思路,不要只限于在相关地质层位里和北东向构造及伴生断裂(即“背斜加一刀”)交会处及其附近,来寻找变质碎屑岩中的脉型金矿。

CHARACTERISTICS OF GRAVITY AND MAGNETIC ANOMALIES AND GOLD ANOMALIES IN SOUTHEASTERN GUIZHOU AND THEIR ORE-PROSPECTING SIGNIFICANCE

In order to tap ore-prospecting potential in southeastern region of Guizhou,the authors interpreted regional gravity magnetic anomalies,studied distribution of gold geochemical anomalies in the Tianjinli gold ore concentration area of eastern region and western region and,as a result,discovered the regularity that the gold ore deposits (ore spots)and gold geochemical (element,block)anoma-lies are related spatially,temporally and genetically to the planar distribution of gravity and magnetic anomalies as well as the distribu-tion of the inferred magmatic intrusions (basic,acid and tectonic alteration rocks)and the regional EW-trending and NS-trending deep and great faults.The results open up the new train of thought in search for gold deposits in the Tianjinli gold ore concentration area of eastern region as well as its periphery.The prospecting for veined gold deposits in metamorphic detrital rocks should not be confined only to the relevant horizons and the intersections between the NE-trending structure and the accompanied faults (i.e.,anticline plus a cut)as well as their nearby places.