西藏自治区谢通门县斯弄多铅锌矿区地球物理特征及找矿方向

Geophysical Characteristics and Prospecting Direction of the Sinongduo Pb-Zn Deposit in Xietongmen County,Tibet

浅成低温热液型矿床是一类主要产于陆相火山岩或与陆相火山岩有关的低温热液矿床,矿床埋藏深度浅是其最大的特点,这也使地球物理勘探方法在这类矿床的勘查中具有先天优势。本文通过对西藏斯弄多Pb-Zn-Ag多金属浅成低温热液型矿床的地球物理参数特征研究,采用激发极化法等综合物探技术在矿体外围探获具有巨大前景的Pb-Zn-Au-Ag浅成低温热液型矿体。目前单工程控制有3段矿体:顶部Au-Ag矿体,中部Au矿体,底部Pb-Zn-Ag矿体。矿体最高Au品位可达5.3g/t,Ag最高品位410g/t,Pb+Zn综合平均品位5.9%。研究结果表明,斯弄多地区林子宗群火山岩物性参数稳定,对矿体异常干扰较小,产于该套火山岩中极强硅化体中的浅成低温热液型Au矿多具有中高极化率和中低阻特征。

The epithermal deposit is a kind of low - temperature hydrothermal deposits mainly hosted in continental volcanic rocks or related to conti- nental volcanic rocks. The most important characteristic of this deposit is shallow burial depth, which makes geophysical methods have natural advantages in mineral exploration of epithermal deposits. Based on the study of geophysical characteristics of the Sinongduo polymetallic epithermal deposit, new Pb - Zn - Au - Ag cpithermal hydrothermal orebodys are successfully discovered by using the integrated geophysical techniques such as the induced polariza- tion. At present, there are 3 sections of ore bodies in the single project control, which are the top Au -Ag ore, the middle Au ore, and the bottom Pb - Zn - Ag ore. The highest grade of Au can reach 5.3 g / t and the Ag can be 410 g / t. The Pb ＋ Zn grade is about 5.9 % on average. Research results show that the physical parameters of volcanic rocks of Linzizong group in the Sinongduo area are stable, and that the disturbance is relatively small. The Au epithermal deposits produced in the strongly silicified geologic masses of the Linzizong group volcanic rocks are mostly characterized by medium - high polarizability and medium -low resistance.