黑龙江乱泥沟金矿成矿条件与找矿方向

Metallogenic condition and prospecting direction of Luannigou gold deposit,Heilongjiang

乱泥沟矿区第四系砂金矿产丰富,是寻找岩金的有利靶区。区内出露的古元古代变质岩系地层的原岩为泥质粉砂岩和中基性海底火山岩,其Au含量高,是金矿成矿的初始矿源层。区内NE,NW向构造发育,所发现的矿体均受控于NW向断裂,呈脉和复脉状产于构造蚀变带及其次一级的层间破碎带中,成矿物质简单,矿体品位和厚度变化系数较小,为中—低温蚀变岩型金矿床。利用物化探测量手段,圈出具找矿意义的组合异常,通过工程查证发现金矿体。在综合研究矿区地质特征及物化探异常的基础上总结了找矿标志,并指出下一步有利的找矿区段。

The Luannigou ore field riches with alluvial gold of Quaternary Period and is the favorable target for rock gold. The protolith of the Paleoproterozoic metamorphic rock series is pelitic siltstone and intermediate-basic submarine volcanic rock. The metamorphic rock series have high Au content and are the primary source bed of gold deposit. The NE and NW strike structure developed well in the area, all the ore bodies are controlled by NW strike fault and occurred in the tectonic altered belt and the secondary interlayer fracture belt as vein and composite vein. The metallogenic matter of Luannigou gold deposit is simple, the alter parameter of grade and thick are little, the Luannigou gold deposit belongs to meso-epithermal altered rock type gold deposit. The favorable association anomaly of geophysical and geochemical prospecting is block out and gold ore bodies are found in it through engineering confirmation. On the base of the study on geological features and geophysical and geochemical prospecting anomaly, the criteria for ore prospecting are summed and favorable ore-hunting area of next are pointed out.