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《Chinese Journal of Geophysics》 1986-05
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CURIE ISOTHERM DEPTHS CALCULATION FROM AEROMAGNETIC ANOMALIES OVER XIKANG AND YUNNAN CONTINENTAL PALEORIFT ZONE

SHEN NING-HTJA LI CHUN-HUA ZHANG GUI-BIN WANG HUA-XIAO(Changchun College of Geology)  
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.
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