Abstract:The uranium resources prospecting started in 1955，xx uranium deposits has been prospected，and 5 uranium ore fields has formed in southwest area. According to the regional uranium metallogenic characteristics and the class of tectonic units in control region，combining concentration degree of uranium deposits，uranium mineral occurrence and mineralized spot, the region can be divided into five uranium metallogenic belts including Gangdise-Tengchong， Sanjiang，northwestern Sichuan，northern Sichuan，central Guizhou and four uranium metallogenic prospective belts including Gangdise, Qamdo, Changtai-Daocheng and Xikang-Yunnan axis.It is considered that the uranium geological metallogenic conditions are favorable besed on researches onmetallogenic characteristics of main uranium metallogenic belts. The breakthrough direction is to expand old mining areasand toopen up new bases.

Strong fluidized rock avalanches with various particle sizes are one of the typical disasters in the mountainous area of southwestern China. Statistical analysis on rock avalanche particles can help understand the traveling behavior, distance, and deposition of rock avalanche, which are useful for potential threat range prediction and disaster prevention. Rock avalanche deposit has more than one oblique slopes different in attitude. Image distortion will happen when particles on the slopes are projected to one plane. Area projection conversion coefficient Ki is applied in this paper to correct the distortion and improve the precision of the geometric dimension parameters of the rock avalanche particle. A rock avalanche (Aerzhai rock avalanche) with a volume of about 10×104 m3 took place in Longxi Township, Wenchuan County, China, on April 8, 2018. Being corrected by the coefficient Ki, the mean area and the standard deviation of the particles within different zones have been obtained, and we analyzed their changes in vertical and transverse directions. Here, we show that the mean particle area decreases by about 61.1% from the source to deposition region and area standard deviation decreases by about 37.4%. The deposition region shows a higher proportion of small crashed particles than the source region. The proportion of small particles gets larger with the longitudinal motion distance and lateral distance. For big particles’ significant potential energy-driving ability and inertia advantages, the longitudinal motion routes can be maintained, and inertia decreases as the particles get smaller, while small particles offset from the center area laterally. These statistical characters are easy to be ignored if projection correction is not performed.