宜里钼矿蚀变特征及其找矿意义

在野外调查、岩芯编录和岩矿鉴定的基础上，将宜里钼矿区的蚀变类型划分为硅化、钾化、绢云母化等主要类型，其中硅化和石英绢云母化与成矿关系密切。编制了矿区平面和剖面蚀变分带图，主要包括石英－白（绢）云母－黄铁矿化带（绢英岩化带）和绿泥石－绿帘石－方解石化带（青磐岩化带）2个蚀变带，与国内外典型的斑岩型钼矿蚀变分带相比，认为宜里钼矿以叠加蚀变为主要特征，即早期的硅化被后期的石英绢云母化和最晚期的碳酸盐化叠加。根据蚀变分带特征，推断严格控制矿体分布的F4断层总体上可能为一逆断层（成矿后活动），暗示F4断层下盘可能还存在一定规模的钼矿体。同时，根据蚀变与矿化的关系，认为在主矿区的南段深部为最有前景的钼找矿勘查区。

Alteration Characteristics of Yili Mo Deposit and its Prospecting Significance

On the basis of the field research，drill core recording and rock and mineral identification，the main alteration types in Yili Mo deposit are divided into silicification，potassic alteration and sericitization，among which the silicification and quartz sericitization are closely related to mineralization. Meanwhile，the alteration zoning map in plane and profile are completed，mainly including two alteration zones of quartz-sericite-pyrite (phyllic alteration) and chlorite-epidote-calcite (propylitic alteration) which is characterized by superimposed hydrothermal alterations，comparing to characteristics of alteration zoning in typical porphyry deposits at home and abroad. That is to say，the early silicification has been superimposed by post quartz-sericitization and the latest carbonatization. According to these characteristics of alteration，the conclusion is that F4 fault might be a reverse fault controlling distribution of orebody，and implying a concealed Mo orebody existed in the fault footwall. According to the relationship of alteration and mineralization，the deep area in the southern section of the main mining area is the most promising molybdenum mineral exploration area.