【摘要】 用四川省物探大队1984年编制的1:100万康滇大陆古裂谷带地区航磁异常图,计算该区居里深度。该图包括的面积约60万km~2,自东经98°至104°30′,北纬24°至34°。在图上以5km的点距取数,100km×100km的方块作个别分析,每块面积与相邻块相重叠一半。每个块内的数据采用频率域的矩谱法及空间域的线性反演及积分迭代法进行分析计算。为了验证方法的可行性作了理论模型计算。 由计算结果得到该区居里温度等深线图,居里点温度的深度在20km至33km之间。结合大地构造特点及已知地热资料,对图进行了分析。更多还原

【Abstract】 A map of aeromagnetie. anomalies on the scale of 1:106 over Xikang- Yunnan Continental Paleorift Zone compiled by Sichuang Geophysical Prospecting Team in 1984 is made to calculate the depth to Curie isotherm for crustal rocks.The area coverage of this region is about 600000 km2, evtending from 98°E to 104°E logitude and from 24°N to 34°N latitude.The magnetic data on the map are digitized with a spacing of 5 km.In the methods used in spectral domain, the whole area is divided into overlapping blocks of the size of 100km×100km. There are 20×20 data points in each block. Every block is analysed seperately. The total number of blocks is 222.Three methods with spectrum of magnetic anomalies moment in spectral domain and two methods of inversion in spatial domain are used to calculate the Curie isotherm depths.In order to asses the feasibility of these merthods, theoretical modeling calculation has been made.With the results calculated, Curie isotherm contour of this region has been delineated. The depth ranges from 20 km to 33 km.The relationship between features of Curie isotherm surface and features of geo-tectonics over this region is discussed.更多还原