赤峰北部地区Pb地球化学块体特征及铅矿资源评价

The Character of Lead Geochemical Blocks and Assessment of Lead Resources in Northern Chifeng Area,Inner Mongolia

以赤峰北部地区的Pb 1/20万化探扫描资料为基础,应用地球化学块体理论与方法,对研究区内Pb的地球化学块体特征及铅矿产资源特征进行了系统研究。确定了2个规模不等的Pb地球化学块体,6个规模相对较小的Pb地球化学异常区。分析了含矿Pb地球化学块体的控制因素:燕山期中酸性侵入杂岩的接触带或接触外带是块体产出的有利部位;二叠系黄岗梁组、大石寨组及侏罗系玛尼土组、新民组和志留系上统杏树洼组等为主要块体赋存层位;北西向、北东向断裂对块体规模具有明显的控制作用。以已知矿床勘探深度1 000 m为准则,计算了块体和异常区的铅矿产资源量以及全区铅矿产资源总量,得出全区铅矿产预测资源量为1 893.53万t。划分出9个铅矿产成矿远景区,其中具有成矿前景的一级远景区3个,分别是子块体1113-1号、1411-1号、3111-1号。

Based on 1/200 000 geochemical exploration data of northern Chifeng area and the theory of geochemical blocks, the authors have studied the characteristics of Pb geochemical block and Ph mineral resources, and identified two Pb geochemical blocks and six relatively small geochemical anomaly areas. Through analyzing the controlling factors of Pb geochemical blocks, the authors suggest that the contacting zone or outer contacting zone of Yanshanian intermediate-felsic intrusive rocks are the favorable locations for the blocks, and the Permian Huanggangliang and Dashizhai Formation, Jurassic Manitu and Xinmin Formation, and Upper Silurian Xingshuwa Formation are considered as the main strata for those blocks. The size of blocks is obviously controlled by NW- and NE- striking faults. By taking 1 000 m as the criterion, the total predicted mineral resource of Pb is 18. 935 3 million tons in the study area. The study area was subdivided into nine Pb prospect areas, and three of them （No. 1113 -1, No. 1411 - 1 and No. 3111 - 1） are first-order areas.