Preliminary study on geological features and genesis of U-Mo deposit No.470

U-Mo deposit No.470 occurs in Mesozoic Hongshanzi volcanic collapsed basin within Inner Mongolia axis at the northern margin of North China Platform. It's composed of several small deposits and occurrences. The deposits and occurrences are controlled by the circular structures F1 and F2 of volcanic basin. Most uranium and molybdenum ore bodies are superimposed ore bodies, a few are independent. Molybdenum and uranium mineralization have close spatial relationship with rhyolite porphyry. Hydrothermal alteration has developed from both high temperature to low temperature, the metallogenetic temperature of uranium is 250∼270 degree C, while the temperature of molybdenum is 308∼394 degree C. Uranium mineralization age is 150∼160 Ma and molybdenum mineralization age is 130∼130 Ma. The deposit is a polygenetic U-Mo deposit produced by post-hydrothermal molybdenum-bearing superimposition on the basis of post-magmatic hydrothermal uranium mineralization in Early Yanshanian. (authors)