青海牛苦头M2矿区深部地球物理异常特征与找矿方向分析

Analysis of deep geophysical anomaly feature and prospecting direction in Niukutou M2 mining area,Qinghai

青海省牛苦头地区是一个铅锌多金属矿富集区,矿点特别多、分布范围广,成矿潜力巨大。综合区内地质、区域矿产和岩石物性特征,M2区块综合地球物理资料分析显示,该区块整体属印支期矽卡岩型多金属矿床,M2与M1、M4成矿环境、断裂构造与成矿通道存在很大差异,两者可能属于不同的构造期次成矿系统。M2铅锌多金属矿床主要受断层控制及热液岩浆上侵形成,花岗岩浆侵入通道与控矿断裂构造存在高度相关性。矽卡岩位于深部花岗岩段附近,浅部低阻矿体极有可能遭到破坏,在M2区块高磁异常钻探(ZK0005)至500 m深度,零星发现两个层位的矿层,并未发现连续有开采价值的矿床(层)。研究花岗岩空间分布特征与位置,利用深部地球物理异常特征信息圈定了矽卡岩成矿有利区域,指出进一步找矿方向。

There are rich lead-zinc polymetallic deposits in the Niukutou area of Qinghai Province.It has a large number of deposits in a wide distribution range,and a huge metallogenic potential.Based on the geological,regional mineral resources and petrophysical characteristics in the area,the comprehensive geophysical data analysis of the M2 block shows that there is an Indosinian skarn type polymetallic deposit in the M2 block.The metallogenic environment,fault structure and metallogenic channel of M2 and M1 and M4 blocks are very different,and they may belong to different tectonic stage metallogenic systems.The M2 lead-zinc polymetallic deposit is mainly formed by ore-controlling fault and hydrothermal magma intrusion.There is a high correlation between granite magma intrusion channel and ore-controlling fault structure.The skarn is located near the deep granite section,and the shallow low-resistance orebody is very likely to be destroyed.During the high magnetic anomaly for the drilling hole(ZK0005)in the M2 block to a depth of about 500 m,two ore layers are found sporadically,but no continuous ore body with mining value is found.The spatial distribution characteristics and location of granite are studied,and the favorable areas for skarn metallization are delineated by using the information of deep geophysical anomaly,and the further prospecting direction is pointed out.