1∶10 000 helicopter aeromagnetic survey and prospecting clues in Taxkorgan iron metallogenic belt,Xinjiang
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.
helicopteraeromagnetic surveymagnetiteTaxkorgen iron metallogenic belt
万方数据
维普
