甘肃东洞沟金矿地质地球化学特征  

GEOLOGY AND GEOCHEMICAL CHARACTERISTICS OF DONGDONGGOU GOLD DEPOSIT IN GANSU PROVINCE

作　　者：白永波[1,2] 蒙轸 高军平[1] 

机构地区：[1]兰州大学地质科学与矿产资源学院,甘肃兰州730001 [2]甘肃省地矿局第二地勘院,甘肃兰州730020

出　　处：《甘肃地质》2014年第3期21-25,共5页Gansu Geology

摘　　要：东洞沟金矿隶属党河南山金成矿带上,为一多期活动的断裂构造和中酸性岩脉双重控矿的蚀变岩型金矿。通过开展1∶5万水系沉积物测量,在本区圈定了Au-4异常,并进一步利用1∶1万土壤测量进行解剖,发现了东洞沟金异常区,部分土壤中金的峰值已达到矿体边界品位,经过后期工程揭露,发现了有价值的金矿化体。综合研究表明,矿区赋矿地层主要为奥陶系硅化砂岩,并受到侵入的闪长岩脉制约,主矿体沿北西向延伸,基本与区域构造方向和圈定的Au异常长轴展布方向一致,所以东洞沟金矿具有良好的找矿前景。Dongdonggou gold deposit is located in Danghenanshan gold metallogenic belt, it is an altered deposit controlled by multi-stage activity of fracture structure and acidic dike. Four Au anomalies are discovered by the 1∶50000 stream sediment surveys in this area, and one gold prospective area is determined by further 1：10000 soil survey. In part of the soil the gold peak has reached the ore cutoff grade. A valuable body of gold mineralization has discovered after a late works reveal. Comprehensive studies show that ore-bearing rock is Ordovician strata mainly silicified sandstone in the mine, and are subject to intrusive diorite dykes constraints,the main ore-body extends along the north west, the basic direction of the regional structure and delineation of Au anomaly consistent with the direction of the long axis of distribution.

关 键 词：奥陶系 金异常 蚀变破碎带 金矿体 党河南山 

分 类 号：P618.51[天文地球—矿床学]