## 4 Results and Discussion
### Stream Sediments from RGNR Project  
Based on the 278 stream sediments' data retrieved from the RGNR project in the study area of Wanquan district of Zhangjiakou city in Hebei province (Figure 2b or Figure 5d), the codes and acidic similarities of LG01 and LG03 lithogenes are calculated and the LG_CR results are derived. The geochemical maps of \(R_{\text{Acidic}}\) of LG01 (Figure 5a), \(R_{\text{Acidic}}\) of LG03 (Figure 5b), and LG_CR values (Figure 5c) are contoured and classified compositionally like the method of the geochemical map [31].  
By comparing Figure 5a,d, we can find that the red areas with \(R_{\text{Acidic}}\geq 80\%\) in LG01 are mainly Jurassic and Cretaceous strata in the central part, the orange areas between 25% \(\leq R_{\text{Acidic}}\leq 75\%\) are mainly Archean and Sinian strata in the southwest and Quaternary strata in the north-central part, and the blue areas with \(R_{\text{Acidic}}\leq 20\%\) are mainly Hannuoba Formation (N\({}_{3}\)) with petrological basaltic materials. In conclusion, the classification results of the stream sediments on the LG01 lithogene are generally consistent with the petrological results derived from the regional geological survey.  
By comparing Figure 5b,d, the results are similar to those from the comparison between Figure 5a,d. The notable difference is that the basic-like components are also recognized in  
Figure 4: Locations of the pathway profiles (**a**) and LG_CR results of soils from the CJPM-1 (**b**) and CJPM-2 (**c**) profiles. Legends in (**a**) are the same as in Figure 2b.  
the southwest on the LG03 lithogene. Overall, the classification results on LG03 are also basically consistent with those derived from the regional geological survey.  
Although nine types of LG_CR can be classified theoretically on double-digit numbers based on the acidic similarities of LG01 and LG03 lithogenes, only six types are recognized in the Wanquan area as lacking the 12, 13, and 31 types (Figure 5c) on the geochemical data of 278 stream sediments, each representing 4 km\({}^{2}\).  
A comparison of Figure 5c,d shows that the red areas in the 11 type are mainly in the Jurassic and Cretaceous strata in the central part. The dark-yellow areas in the 21 type are mainly in the Jurassic and Quaternary strata in the central and southern part, occurring as the transition zone between the 11-type and 22-type areas. The orange areas in the 22 type  
Figure 5: Geochemical maps of R\({}_{\text{Acidic}}\) of LG01 (**a**), R\({}_{\text{Acidic}}\) of LG03 (**b**), LG_CR values (**c**), and the geological map (**d**) in the study area.  
are mainly in the Jurassic and Quaternary strata in the central and in the Archean and Sinian strata in the southern part.  
The light-yellow areas in the 23 type are mainly in the Archean strata in the southwest part and as the transition zones between 22-type and 32-type areas in the Hannuoba Formation (N\({}_{3}\)) in the north part. The light-blue areas in the 32 type are also as transition zones between 23-type and 33-type areas in the north part, while the dark-blue areas in the 33 type are mainly distributed in the Hannuoba Formation (N\({}_{3}\)) with petrological basaltic materials.  
Furthermore, the 10 sediment profiles are located in the 11 type of LG_CR (Figure 5c) area determined on the stream sediments with a scale of 1:200,000, which is basically consistent with the results derived on the soils from the two pathway profiles (Figure 4b,c).  
In summary, the main types of LG_CR of stream sediments in the Wanquan area are 11, 22, and 33 types. The lithological results of LG_CR on geochemical lithogenes are basically consistent with the petrological results derived from the regional geological survey. However, the LG_CR method is applicable to stream sediments, soils, debris, and rocks in wider geological materials, rather than only rocks in petrology. Therefore, the LG_CR method will be a useful tool for lithological mapping in the petrological overburdened areas.