内蒙古希莫勒地区的原生晕特征和找矿前景

内蒙阿拉善希莫勒地区位处铁、金、铜、钛、钴、镍找矿远景区,区内原生晕处在奥陶纪辉长岩体区和NE向断裂破碎带中,规模较大,分带明显。原生晕主要成晕元素组合为Co、V、Ti、Ni、Zn,Co是主成矿元素、直接指示元素,V、Ti是直接指示元素,Ti、Co、Zn、Cu、V元素相关性好,具外、中、内三级浓度分带,主要成晕元素Co、V、Ti内浓度带直接指示磁铁矿体、强磁异常体的赋存位置,As、Ni、V、Co为原生晕前端元素,Cu、Ag、Au、Mo为原生晕过渡带元素,Ti、Pb、Zn为原生晕后端元素。前缘晕元素(Ti×Co×Zn×V)与尾晕元素(Cu×Ni×Au×As)的累乘比值反映矿化体剥蚀程度,随地形标高降低和深度增加,累乘比值逐渐升高,进而反映该区剥蚀程度较浅,深部矿体资源潜力较大。希莫勒地区成矿地质和地球化学环境较好,深部找矿潜力大,具较好的铁、钴、钒等多金属矿找矿前景。

Characteristics of primary haloes and ore-search prospect in the Ximole district of Inner Mongolia

The Ximole area of Alashan, Inner Mongolia is located in an ore prospecting region with iron, gold, copper,titanium,cobalt,and nickel.Its primary haloes appear in the gabbro bodies and NE-trending fracture zones, featured by a large scale and obvious zonation. These haloes comprise of combined elements such as Co,V,Ti,Ni,Zn. Of them Co is the main ore-forming element, V and Ti are direct indicating elements,and Ti,Co,Zn,Cu,and V elements are well correlated. There are concentration zoning of three grades, i.e. outside, middle, and interior. The inner zone of main halo elements Co,V,and Ti halo indicates directly the localities of magnetite ore bodies and strong magnetic anomaly bodies. As,Ni,V,and Co are frontal elements of primary haloes, Cu,Ag,Au,and Mo are those in the transition zone, and Ti,Pb,and Zn in the back-end. The multiplicative ratios of frontal halo elements(Ti×Co×Zn×V)and tail halo elements(Cu×Ni×Au×As) reflect denudation degrees of mineralized bodies. Such ratios decrease with the terrain elevation and increase with depth, thus implies the erosion degree is low and there exists a large potential of deep ore resources in this area. In sum, the Ximole area has a good geological and geochemical environment and large potential of deep prospecting for iron,cobalt,vanadium and other metallic ores.