Xilingti demonstration area

The experimental area is located in Xilingti Forest Farm, southwest of Arihe Town, Oroqen Autonomous Banner, Inner Mongolia Autonomous Region, which belongs to the sub-landscape area of forest swamp in low mountains and hills. In 2004, the demonstration production of 1∶50000 geochemical survey was carried out with the working method of gully system sediment measurement as the main method and soil and water system sediment measurement as the auxiliary method. In order to eliminate the interference of organic matter, the "rinse sampling method" is adopted for the measurement and sampling of river sediments, and the sampling particle size is -20 mesh. Completed working area 189km2, with 625 sampling points and an average sampling density of 3.3 points /km2. Among them, there are 294 sampling points for gully sediment measurement, accounting for 47.04%; There are 196 sampling points in soil survey, accounting for 31.36%; There are 135 sampling points for river sediment measurement, accounting for 2 1.60%.

Through the geochemical survey of 1∶50000, nine geochemical anomalies with certain scale and work value were found. They are as- 1agguau anomaly, as-2aagaucu (mo) anomaly, a3-a3-A3-3AgAuMo anomaly, as-4auag anomaly, as-6 uaag anomaly, as-7aauagassb anomaly and as-8 amgmocau(pbzn) anomaly.

As-7 auagassb anomaly is located in coarse sandstone, slate and granulite of Sinian Jixiang Gou Formation near ne ductile shear zone, and there is a small placer gold deposit several thousand meters downstream. The anomaly area is 6km2, in which the main anomaly of Au element is NNE direction, 3.5km long and1~1.5km wide. Abnormal content: Au (3.17 ~ 25.89 )×10-9, Ag (0.5 ~ 2.13 )×10-6. The abnormal shape is complete, the content is medium and high, the AuAg element is closely related, and it has certain metallogenic geological conditions, which is a promising target area for finding rock gold deposits.

As-8 agmocauu(pbzn) anomaly is located in the northern margin of the upper Jurassic volcanic basin, and the anomaly area is >: 1 1km2. The anomaly has two centralized centers, which are connected into a whole by the anomaly range delineated by Ag ≥ 1× 10-6. The eastern centralized center is equiaxed, with an area of 4km2. The abnormal contents are: Ag (1 ~ 5) × 10-6, Au 3.6 × 10-9, Cu (138 ~ 506) × 10-6. The abnormal contents in the western enrichment center: Ag (1 ~ 3.08) × 10-6, Au (3.28 ~ 20.17 )×10-9, Mo (4 ~ 80 )×/kloc-. The abnormal shape is complete, the content is medium and high, and it is closely related to the metallogenic elements such as CuMoAuAg, which has certain metallogenic geological conditions and is a promising target area for finding copper-molybdenum polymetallic deposits.

As-9 agaucumo anomaly is located in the southern margin of the Upper Jurassic volcanic basin, with an anomaly area of >: 6km2. Abnormal contents: Ag (0.5 ~ 2.9) × 10-6, Au (4.6 ~ 6) × 10-9, Cu (118 ~ 275 )×1. The anomaly characteristics and metallogenic geological conditions are basically consistent with As-8 anomaly, which is a favorable target area for copper polymetallic deposits.

Figure 5-7 Comprehensive geochemical anomaly map of Lingti survey area 1∶50000.

As-2 agaucu (Mo) anomaly is located in coarse sandstone, slate and granulite of Sinian Jixiang Gou Formation on the west side of NE ductile shear zone. The abnormal area is 1 1km2. Ag (0.5 ~ 5.06) × 10-6, Au (2.5 ~ 24.33) × 10-9, Cu (176 ~ 381)×1. In the southern section of the anomaly area, the Armed Police Gold Force had previously conducted a general survey of rock and gold deposits, but it was evacuated due to the low grade of ore (gold grade of 0.ng/t). According to the results of this work, the main anomalies in this area are mainly on the northern slope of the mountain. This anomaly needs to be further verified to find out the relationship between the part of the Armed Police Gold Force devoted to prospecting projects and geochemical anomalies, and to determine the prospecting prospect and the next work deployment in this area.