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. The North China Craton (NCC) is one of the oldest cratonsin the world. Currently, the destruction mechanism and geodynamics of theNCC remain controversial. All of the proposed views regarding the issuesinvolve studying the internal density structure of the NCC lithosphere.Gravity field data are among the most important data in regard toinvestigating the lithospheric density structure, and gravity gradient dataand gravity data each possess their own advantages. Given the different observational plane heights between the on-orbit GOCE(Gravity Field and Steady-State Ocean Circulation Explorer) satellite gravity gradient and terrestrial gravity and the effects of theinitial density model on the inversion results, sequential inversion of thegravity gradient and gravity are divided into two integrated processes. Byusing the preconditioned conjugate gradient (PCG) inversion algorithm, thedensity data are calculated using the preprocessed corrected gravity anomalydata. Then, the newly obtained high-resolution density data are used as theinitial density model, which can serve as constraints for the subsequentgravity gradient inversion. Several essential corrections are applied to thefour gravity gradient tensors ( Txx , Txz , Tyy , Tzz ) of the GOCE satellite, after whichthe corrected gravity gradient anomalies ( T ′ x x , T ′ x z , T ′ y y , T ′ z z ) are usedas observations. The lithospheric density distribution result within thedepth range of 0–180 km in the NCC is obtained. This study clearly illustrates that GOCE data are helpful in understandingthe geological settings and tectonic structures in the NCC with regionalscale. The inversion results show that in the crust the eastern NCC isaffected by lithospheric thinning with obvious local features. In themantle, the presented obvious negative-density areas are mainly affected bythe high-heat-flux environment. In the eastern NCC, the density anomaly inthe Bohai Bay area is mostly attributed to the extension of theTancheng–Lujiang major fault at the eastern boundary. In the western NCC,the crustal density anomaly distribution of the Qilian block is consistentwith the northwest–southeast strike of the surface fault belt, whereas suchan anomaly distribution experiences a clockwise rotation to a nearlynorth–south direction upon entering the mantle.

solid earth

Sequential inversion of GOCE satellite gravity gradient data and terrestrial gravity data for the lithospheric density structure in the North China Craton