【摘要】 豫西南地区是我国中部重要的多金属成矿远景区,找矿前景巨大。本文中利用重力、航磁和深部地球物理剖面资料,解析研究区三维岩石圈结构,揭示深部构造特征,进而探讨深部成矿作用。结果表明,研究区莫霍面顶面形态基本上呈东高西低,地壳厚度由东向西增大。壳—幔结构的不均一性制约着成矿系统物质和能量的交换。矿集区位于幔向斜内,其地壳增厚处、莫霍面的梯度变化处或变形部位成矿强度大。幔背斜与幔向斜之间过渡带有走向超壳型深大断裂(如栾川断裂和朱阳关断裂),其与次级断裂的交汇处,岩浆、变质与成矿作用十分强烈,深部通道为成矿物质来源提供了较好的成矿条件,因此是形成大型、超大型矿床的有利地段。更多还原

【Abstract】 Southwest Henan is the major polymetallic metallogenic prospecting area in the middle of China. Based on gravity, airborne magnetic and deep geophysical section, the structure of 3-D lithosphere in the area is dissected. The feature of deep structure in the area is revealed, and the deep metallogenesis is discused. It is suggest that the discontinuity of the top shape of Moho in the area appear high in the east and low in the west. The crust of the earth becomes thicker and thicker from east to west. The structural heterogeneities of the mantle-crust control the exchange of energy and matter in the ore system. The metallogenesis district lies in the mantle-syncline. The ore-forming process becomes stronger at the place of the thicker crust and the Moho gradient change. There are deep-large strike faults (for example, Luchan-fault and Zhuyangguan-fault) cutting the crust in the transition belt between mantle-syncline and mantle-anticline. The magmatism, metamorphism and ore formation are extremely strong in the intersection of the faults and secondary-faults. The deep passages supply the source of ore-forming matter with good metallogenic conditions. So, They are favourable space of forming large and super-large mineral deposits.更多还原