The Taxkorgan metamorphosed sedimentary iron metallogenic belt in Xinjiang is located in the high altitude and sharp topographic Karakoram Mountains.Ore prospecting in this area is a tough challenge in spite of its supe-rior metallogenic geologic conditions due to locating in no-human-zone and poor transportation.1∶50 000 aero-magnetic survey in study area was finished by using fixed-wing plane.But the average flight altitude is too high(794 m).It's difficult to discriminate aeromagnetic anomalies caused by magnetite because they are relatively smooth.Helicopter-borne geophysical survey has more advantages in the complicated terrains than fixed-wing plane aero-geophysical survey,for example lower cost,better flexibility,better stability,lower flying altitude to acquire more aero-geophysical information etc.In this paper,we present the results of a 1∶10 000 helicopter-borne aeromagnetic survey over aeromagnetic anomaly Xin-C-1999-13,Xin-C-2008-1324 and Xin-C-2008-1285 in no-human-zone of Taxkorgan,which were discovered by 1∶50 000 fixed-wing aeromagnetic survey.Compared with the past data,the newly collected high-precision and high-resolution aeromagnetic data can depict the aero-magnetic anomalies more meticulously.Various anomaly separation techniques were used to decompose aeromag-netic anomalies and some aeromagnetic anomalies maybe caused by magnetite were discriminated.We attempted to use a helicopter to transport personnel to the centre of magnetic anomalies for field geologic reconnaissance immediately after finishing aeromagnetic survey,and discovered floats/boulders of magnetite in the area of aero-magnetic anomaly Xin-C-1999-13.This attempt proves that the helicopter aeromagnetic survey and field magne-tic anomaly verification by helicopter transportation are fast and effective in high altitude and deep cutting moun-tainous areas.This might offer the valuable reference for the new round of prospecting breakthrough strategy in mineral exploration covering the high altitude,deep cutting and uninhabited mountainous areas.
关键词
直升机/航空磁法测量/磁铁矿/塔什库尔干铁矿带
Key words
helicopter/aeromagnetic survey/magnetite/Taxkorgen iron metallogenic belt
维普
万方数据