关键词: 太行山, 重力梯级带, 密度结构, 最优化反演方法

Abstract: In eastern China, there is a great gravity anomaly zone which extends from the Daxinganling Mountains, through the Taihang Mountains to the Wuling Mountains. This zone is presumably associated with the structural variation in the deep crust. We select the Fuping Dingzhou profile, which is perpendicular to this gravity anomaly zone, to make an inversion analysis of the crust upper mantle density using the data of seismic sounding and Bouguer anomaly. The result shows that the density distribution of the crust and upper mantle along this profile is evidently heterogeneous. The general feature is that the density is relatively low in the west and high in the east. The lateral variation of the crustal thickness basically determines the generation of the Bouger gravity anomaly zone. Taken the Mesozoic and Cenozoic tectonic evolution of North China into account, it is suggested that this gravity anomaly zone was developed after the Yanshan period and associated with plate interaction and thermal mass transfer of the upper mantle.

Key words: Taihang Mountains, gravity zone, density structure, optimum inversion method