The Study Of Magnetic Correspondence Analysis Over Longmen Mountain Tectonic Belt And Its Adjacent Areas

Longmen mountain structural belt is an important part of North South tectonic belt, Since the70’s in last century in Longmen mountain and its surrounding areas carried out some deep geophysical detection,, Petroleum system in Longmen mountain area, the seismic reflection profiles, obtained the important scientific data, laid the foundation for the study of continental block collision mechanism and dynamics of the Longmen mountain area.Based on the collection, collation of former research data, borrow with Bouguer gravity data and aeromagnetic data in the deep North South tectonic Longmen tectonic belt on the belt and its adjacent area are studied. The main method is to use the difference between the cutting law in the first field gravity and magnetic separation, and then do a lot of cutting, analyzed the gravity and magnetic data of Longmen mountain structural correspondence analysis method. At the same time, discusses the method of interpolating cut method and the corresponding analysis principle and geological interpretation.The preliminary analysis:(1) the Longmen tectonic belt of crustal structure is complex, the Songpan Ganzi block belongs to non normal crustal structure. Sichuan massif belongs to the normal crustal structure.(2) from the field correlation coefficient of two is very similar, very high correlation between the two blocks, but heavier, magnetic field a symbol of two differences are very big, do not support the two belong to the same base point.(3) The interpolation cut method separated region field and the local field and magnetic correspondence analysis correlation coefficient showed deep shell buried NW existence to the abnormal bands. Wenchuan earthquake not only by the North East to control the Yingxiu fault, may also with deep in North West to the heavy, magnetic anomaly zone.