大兴安岭南段白音诺尔矿田锡多金属成矿特征与隐伏锡矿找矿预测

大兴安岭南段是我国锡矿资源潜力较大的地区之一,白音诺尔矿田关于铅锌矿的开采已超40年,近年来在铅锌矿外围还发现了前景可观的锡矿。本文以多年的野外勘查成果为基础,从矿源层、成矿期次与矿化阶段等方面探讨了矿区锡多金属成矿特征,利用成矿构造、蚀变矿化分带、成矿专属性特征标志带、重-磁-电等地球物理特征、成矿元素-挥发份元素-烃汞氡元素化探异常特征,建立了成矿模式,总结了矿区锡矿找矿预测标志,在锡矿勘查区的北西部圈定了隐伏锡矿找矿靶区,并提出了具体的验证方案。

Tin polymetallic metallogenic characteristics and prospecting prediction of concealed tin deposits in Baiyinnuoer ore field, southern section of Greater Khingan Mountains

The southern section of Greater Khingan Mountains is one of the areas with great potential for Tin Mineral succession resources in China. The Baiyinnuoer ore .eld has been exploiting lead-zinc deposits for over 40 years. In recent years, considerable tin deposits have also been found outside the lead-zinc deposits. Based on the .eld exploration results for many years, this paper studies the tin-polymetallic metallogenic characteristics in the ore area from the aspects of source bed, metallogenic period and mineralization stage, and establishes the metallogenic model by utilizing the geophysical characteristics such as metallogenic structure, alteration mineralization zoning, metallogenic special characteristic marker belt, gravity-magnetic-electric, mineralizing element-volatile element-hydrocarbon mercury-radon element geochemical anomaly characteristics, and summarizes the metallogenic model. The prognostic indicators for tin prospecting in the ore area delineate the target areas for concealed tin prospecting in the north and west of the tin prospecting area and put forward speci.c veri.cation schemes.