The Study Of Gravity And Magnetic Data Processing And Interpretation Method On Boundary Delineation And Shape Inversion Of Rock Body In South China

With the rapid development of the national economy, the demand for mineralresources is growing quickly. The existing resources can not meet the increasingdemand which forces the geological researcher to change thoughts and develop newprospecting area. In order to look for more and better blind ore, exploring the deepstrata becomes a new field that can not be ignored by geological researcher.Regional gravity and magnetic data interpretation is the most efficient andeffective way to reveal the deep rock masses. It has a unique effect on the division oftectonics and regional geological structure, the distribution of igneous rocks and thedelineation of buried rock, etc.Delimitation of deep rock masses is extremely important in finding concealedore. Metallic mineral usually deposits in the top and edge of the rock or the outer andinner zone of the rock. So finding the buried rock and determining its scope can beused not only as a direct or indirect prospecting means, but also as an importantgeophysical basis for the deep ore prospecting, the selection of district and workdeployment of investigation and assessment of mineral resources. which hasimportant significance for further works in the potential investigation of deep metalmineral.The research contents of this paper are as follows:Firstly, the qualitative interpretation techniques has been evaluated from theprocessing results of theoretical model and practical data, A set of technologicalprocess has been provided to delineate, inverse and integrated interpretation of deeprock masses.Secondly, based on the existing regional gravity, aeromagnetic data and thetraditional potential field conversion method, combined with field source boundaryidentification technology such as the oblique derivative method etc. and referencinggeological map, geochemical and other data, the deep concealed rock mass inSouthern China.has been delineated. Thirdly, in the aspects of gravity and magnetic data processing technology, I putforward the space domain and frequency domain data expansion and grid data spaceinterpolation technique, and realize the technology of transforming the2.5dimensional profile inversion model data and3D inversion model data into3Dhuman-computer interaction program model file. Finally, these technologies areapplied to deep concealed rock delineation and morphological study in the southernChina and have achieved the good application effect.Fourthly, based on the rock density and magnetic data in the study area, I makefull use of geology, drilling and other geophysical data and finish thethree-dimensional quantitative inversion of a part of local gravity anomaly inSouthern China and infer the depth, size and spatial morphology of these concealedrock masses.