Magnetic structure of the continental crustal cross-section in the centralNorth China Craton: Implications for deep geological structure and geodynamical processes

The saturation magnetization (J(s)) and saturation isothermal remanent magn etization (J(SIRM)) are measured for 44 samples from the Wutai-Jining crust al cross-section in central North China Craton. Results show that rock magn etism primarily depends on metamorphic grade and less depends on lithology. The greenschist-, amphibolite- and granulite-facies rocks have average sat uration magnetization (J(s)) of 58.7A/m, 686.2A/m and 1068.0A/m, respective ly, and their J(SIRM) are 4.1A/m, 77.9A/ m and 138.4A/m, respectively. Vari ation coefficients (V-c) of J(s) increases from 62.2% in the upper crust th rough 62.5% in the middle crust to 143.7% in the lower crust. Similarily, J (SIRM) increases from 70.7 through 86.1, to 165.4%. This documents consider ably greater heterogeneity in the lower crust compared to the upper and mid dle crust. Combination with longwavelength magnetic anomalies from Magsat i nfers that the Jining terrain is responsible for lower crustal magnetizatio n in the region. if thermal viscous remanent magnetization (TVRM) is domina te component of remanent magnetization, the total magnetization of lower cr ust in the central North China craton may reach 4.85A / m. The value is com parable to the magnetization of the lower crust from shield areas in other parts of the world.