Research of the morphology of magnetic anomaly source

• 1、Department of Land and Resources of Hunan Province,Changsha 410009,China
• 2、School of Geosciences and Info-Physics,Central South University,Changsha 410083,China
• 3、Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring（Central South University), Ministry of Education

Abstract：The research of the magnetic anomaly field source morphology contributes to the comprehension of the formation and development of the magnetic resource, also contributes to the research of the geological structure and quantization of the field resource information assessment. This article proposed a new inversion way to judge the magnetic field source morphology. The method based on the magnetic field composition theory and conjugate-triangle interpret theory. For the irregular shape source, we use a series regular thin plates to constitute a superposition model(variable model), so the filed of the irregular shape source can be calculated easily. Then, based on the conjugate-triangle interpret theory, using a single plate anomaly interpretation method to interpret the superposition model anomaly, after normalization processing, compares to the superposition model, the position of the feature points of the single plate has vector displacement, the calculus value (integral, first-order differential,second-order differential value) of these two kind of anomaly shows obvious difference, doing subtraction of these two calculus value, different downard trend body has different signs combination mode. So, we proposed the 3 sigma signs morphology judgment method to recognize the downward shape change trend of the source. After we judged the rough morphology, we adopt the series thicken method which is adding a series different thin plates to make the single plate approach the real source morphology, when the 3 sign combination is approaching "000", we can deem we get the real source morphology, and the parameters of the source is also gotten.

Keywords： Earth-exploration and Information Techniques field source morphology superposition model vector displacement calculus value morphology judgment