The following equation is proposed in this paper to estimate the crustal growth rate of the North China Platform on the basis of mass equilibrium between the crust and the mantle:The results indicate that the mass fra...The following equation is proposed in this paper to estimate the crustal growth rate of the North China Platform on the basis of mass equilibrium between the crust and the mantle:The results indicate that the mass fractions of the crust during different geological periods are close to the real mass fractions of the crust in the upper mantle and the whole mantle (2-2.5% and 0.5 -0.6%, respectively, Hofmann, 1986), and the discrepancy of the results is probably related to that the heterogeneous contribution of the mantle to the crust both in space and in element. The results also show that the mass of the Archaean crust is only half that of the Proterozoic crust, and the crustal mass remained unchanged from Proterozoic to Paleozoic. suggesting that the plate movement at least started from the Late Proterozoic.展开更多
文摘The following equation is proposed in this paper to estimate the crustal growth rate of the North China Platform on the basis of mass equilibrium between the crust and the mantle:The results indicate that the mass fractions of the crust during different geological periods are close to the real mass fractions of the crust in the upper mantle and the whole mantle (2-2.5% and 0.5 -0.6%, respectively, Hofmann, 1986), and the discrepancy of the results is probably related to that the heterogeneous contribution of the mantle to the crust both in space and in element. The results also show that the mass of the Archaean crust is only half that of the Proterozoic crust, and the crustal mass remained unchanged from Proterozoic to Paleozoic. suggesting that the plate movement at least started from the Late Proterozoic.