The Characteristics Of Magnetic And Gravity Field And The Structural Division Of Regional Geologic Structure In Xizang Autonomous Region

The main target of this thesis is extracting the areal structure information of the Xizang Autonomous Region.The main raw data used in this thesis is derived from regional gravity data and aeromagnetic data, which is in scale of 1: 1000000. And this thesis adopt potential field way as the data processing technique,such as reduced to the magnetic pole, calculating the horizontal first derivative and directional derivative of aeromagnetic data, calculating the regional field and the horizontal first derivative and the residual gravity anomaly of bouguer gravity anomaly,calculating the second derivative and the absolute value of horizontal gradientof residual gravity anomaly ,upwarding continuation etc.Based on these processing method and many former achievements and materials,This thesis inferred the areal structure of the Xizang Autonomous Region according to the magnetic signature and the gravitional signature. Furthermore, the raw data of some typical profile is chosen to inverse the important structure by 2.5D gravity and magnetic inversion software.Based on the integration of data from various sourcess and the interpretation work of raw data and processed data, this thesis correspondingly finished the interpretational map of gravity and magnetic. According to these work, the distribution of areal geologic structure, faulting, magmatic rocks, volcanic layers and sedimentation basin, can be confirmed. To sum up, these results offer much important geophysical exploration data to mineral resources dividing and assessing.