The Application Of Multiple Aero Geophysical Methods in Qixin Cu-Ni basic-ultrabasic rockbody,Xinjiang province,China

We conducted aeromagnetic survey, triaxial aeromagnetic gradient survey and airborne electromagnetic survey at Qixin area ,Xinjiang province, China and strong negative magnetic anomalies were observed above the Qixin rockbody ,which the amplitude reached more than 1300nT(flight altitude 150m).During the survey,the measurement line intervals were almost 100 m and the total measurement length was about 28000 km. According to the 1:10000 geological survey of this area,the Qixin rockbody is consists of gabbro, olivine gabbro, olivine pyroxenite and pyroxene peridotite, and the residual magnetism of olivine pyroxenite ,the main Cu-Ni ore-bearing rockbodies , are strong(above 7.5A/m on average) . In vertical gradient data, most of the Ultrabasic rock are located at the center position of the positive and negative anomalies, and the Cu Ni deposits discovered were located near the negative anomalies. Ore block 3, the high-grade Cu-Ni ore block which the highest grade of Ni is 11%, is located at the east part of Qixin rockbody , edge of a negative magnetic anomaly, exploration drilling discovered a small olivine pyroxenite rockbody according to the magnetic anomaly, which is considered to be potential for Cu-Ni metallogenic prospect. Transient Electromagnetic Methods(TEM) were conducted above the rockbody and Inversion imaging results reveals 6 prospecting areas. According to the experiments we did above rre block 3, the relationship between TEM anomalies and Cu-Ni mineralization are obvious.We conducteda quantitative inversion of Ore block 3 under the constrain of drills based on the high-precision aeromagnetic survey data of transverse gradient,longitudinal gradient and total magnetic field. Prospecting areas were delineation,but still need drilling for verification. The phenomenon of magnetization reversal is still a problem and important to the Cu-Ni metallogenic regularity in this area .We are conducting aeromagnetic three-component survey in this area, advanced conclusion could be achieved after the survey.