## 3 Results
### Comprehensive Information on the SD Profile  
According to lithospheric magnetic anomalies, regional geological structures, remanent magnetization, magnetic susceptibility, seismicity, and lithology, we obtain the comprehensive comparison map shown in Figure 4.  
Figure 4 shows comprehensive information about the geophysics and geological structure of the SD profile, including the three parts (basement \(\rm f_{b}\), middle layer \(\rm f_{m}\), and superficial \(\rm f_{s}\)) derived from lithospheric magnetic field decomposition, as well as the lithology, magnetic susceptibility and remanent magnetization of rock samples, and the distribution of seismic activity. In Figure 4, the distribution of the lithospheric magnetic field decomposition parts, the seismic activity, and the magnetic susceptibility and remanent magnetization of rock samples along the SD profile are shown from top to bottom. In area A, the most and strongest earthquakes occurred. There were two earthquakes with a magnitude of 6 or higher and two with a magnitude of 5-6. The magnetic susceptibility and remanent magnetization of the rock samples are generally relatively high. In contrast, in area B, small earthquakes with a magnitude of 3-5 have occurred, the magnetic susceptibility and remanent magnetization of the rock samples are generally low, and the lithologies are dominantly sedimentary. However, in area B near area A, where the lithospheric magnetic field changes are sharp, the magnetic susceptibility and remanent magnetization of the rock samples are also high, and the lithologies are igneous or metamorphic. In area B, near area C, the magnetic susceptibility and remanent magnetization of the rock samples are also high. The rock samples are igneous or sedimentary, and the variation in the lithospheric magnetic field is uneven. In area C, there are also a high number of earthquakes, with 3 earthquakes with magnitude 5-6, and the magnetic susceptibility and remanent magnetization of the rock samples are generally high. On the whole, in area C, magmatic rocks dominate in the north, while sedimentary rocks become more common in the south. Due to Quaternary coverage, the number of collected rocks is low. In area D, there were also numerous earthquakes with a magnitude of 3-5 and one with a magnitude of 5-6. Due to Quaternary coverage, the number of rock samples and the  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline
**Zone** & \(\rm\bf F_{1-max}\) & \(\rm\bf F_{1-min}\) & \(\rm\bf f_{b-max}\) & \(\rm\bf f_{b-min}\) & \(\rm\bf f_{m-max}\) & \(\rm\bf f_{m-min}\) & \(\rm\bf f_{s-max}\) & \(\rm\bf f_{s-min}\) \\ \hline A & 2104.0 & \(-\)544.1 & 246.3 & \(-\)23.3 & 425.1 & \(-\)17 magnetic susceptibility and remanent magnetization of rock samples are generally low. The lithologies are mainly sedimentary. For a more comprehensive analysis and comparison, detailed parameters in the divided areas of the SD profile in Mongolia are shown in Table 2, such as the lithospheric magnetic anomalies and structures, remanent magnetization and susceptibility, seismicity, and lithology. The structural names of the four regions, A, B, C, and D, are therogenic belt of Vitrim, Erhotsk, Erguna, and Southern Mongolia, respectively. From A to D, the basement part f\({}_{\rm b}\) variation ranges of the lithospheric magnetic field are 269.5 nT, 83.5 nT, 107.6 nT, and 15.1 nT, respectively. The middle layer part f\({}_{\rm m}\) variation ranges of the lithospheric magnetic field are 603.4 nT, 153.5 nT, 151.3 nT, and 39.8 nT, respectively. The superficial part f\({}_{\rm s}\) variation range of the lithospheric magnetic field is 2201.0 nT, 441.3 nT, 1134.5 nT, and 215.1 nT, respectively. The remanent magnetization variation range of rock samples are respectively 0.5-34,246, 0.4-1833.7, 0.8-4726.5, and 1.1-33.4, and the unit is 10\({}^{-3}\) A/m. The magnetic susceptibility variation ranges of the rock samples are \(-\)1.0-11,762, \(-\)0.8-4378, \(-\)1.3-3275.7, and 10.4-37.6, respectively, and the unit is 10\({}^{-5}\) SI.