大厂锡多金属矿区深边部找矿中的TEM异常特征

Abnormal Characteristic of TEM Response for Prospecting Depth and Margin Area of Tin Polymetallic Deposit in Dachang

为解决大厂矿田后备资源问题,采用大功率瞬变电磁法(TEM)在矿田西带深边部找矿研究中发现:已知超大型矿床92号和100号矿体均为缓倾厚层状矿体,TEM异常特征均为箱形或似箱形;105号矿体为陡倾厚板状矿体,TEM异常均为双峰盖帽特征。据此,对深边部未知区获得的TEM异常进行解释,圈出了空间定位的深边部找矿靶区。其中,大部分得到地质上的认同,有的经验证已见到深部未知矿体。实践证明,大功率TEM法在大厂矿区已知矿深边部找矿中是有成效的。

To solve the problem of reserve resources at Dachang ore field,High-power transient electromagnetic method（TEM） was used to prospect depth and margin area of west field.It was showed that No.92 and No.100 nine,the known large mineral deposit,were both slow dipping and thick ore body,the abnormal characteristic of TEM response was box style or box-like style,No.105 mine was steep dipping and thick ore body,the abnormal characteristic of TEM response was cap-like with dual peak downward style.According to these characteristics,the prospecting targets at depth and margin area of the known mine were located in 3D view by explaining the TEM abnormality obtained in the unknown area.Most of them were approbated by geologist.Some of them were verified and unknown mines were exposure.It was proved by practice that TEM was one of the most effective methods to prospect the deep and verge of the known area.