新疆西天山东段航磁异常特征及找矿效果

Aeromagnetic anomaly characteristics of eastern segment of the West Tianshan Mountains,Xinjiang and the ore-prospecting effect

介绍了高精度航磁调查在西天山东段的应用效果.在高精度航磁图上,展现出多个不同磁场背景及磁异常特征区,它们是不同构造、岩浆活动、地层及岩性分布的综合反映.该区不仅区域磁场特征明显,而且局部异常信息也极为丰富.在最新的高精度航磁图上,已知铁矿异常特征明显,为矿区外围勘探和同类地区寻找新的铁矿提供了依据.利用高精度航磁资料,新发现了五十余处铁矿异常,在2007年进行了地面查证的5处异常中,有4处见矿.这些新的铁矿异常的成功发现不仅带来了巨大的经济效益,也为今后利用高精度航磁测量在类似地区进行找矿积累了经验.

The West Tianshan Mountains is located at the west section of Tianshan MetaIlogenic Belt. The high- precision aeromagnetic method has been successfully used to discover the iron deposits in this area. The high- precision aeromagnetic map contains very ahoundant magnetic anomaly information. The anomaly character is clearer on potential-field data processing map. The known iron deposits are clearly demonstrated in the map and, in addition, more than 50 iron anomalies are reflected in the map. The inspection of five anomalies led to the discovery of four ore-related anomalies. The discovery of these four ore-related anomalies has not only brought remarkable economic benefit but also provided typical examples for further application of high-precision aeromagnetic survey to the ore-prospecting work. This paper describes the typical known iron deposits aeromagnetie anomalies and the orerelated anomalies. Base on the results obtained, author bring forward that high-precision aeromagnetic survey and in time ground anomaly inspection mate together is an effective means of founding iron ore deposit in the Western Tianshan Mountain and other low-exploration areas.