470铀钼矿床地质特征及成因的初步探讨  

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

作　　者：马国祥[1] 李长华[1] 于振清[1] 杨志亮[1] 

机构地区：[1]核工业243大队,内蒙古赤峰024006

出　　处：《世界核地质科学》2009年第2期91-95,共5页World Nuclear Geoscience

摘　　要：470铀钼矿床产于华北地台北缘内蒙地轴之内的中生代红山子火山塌陷盆地中,由多个小矿床、矿点组成。各矿床(点)受火山盆地的环形断裂F1、F2控制,铀钼矿体多为叠加矿体,少数独立存在。铀钼矿化与流纹斑岩的空间展布关系密切。热液蚀变从高温到低温均有发育,铀成矿温度为250～270℃,钼成矿温度为308～394℃。铀成矿年龄为150～160Ma,钼成矿年龄为120～130Ma。该矿床是在燕山早期岩浆期后热液铀矿化的基础上,经后期含钼热液叠加作用而形成的复成因铀钼矿床。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 metallogenetie temperature of uranium is 250-270℃, while the temperature of molybdenum is 308- 394℃. Uranium mineralization age is 150-160 Ma and molybdenum mineralization age is 120-130 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.

关 键 词：火山塌陷盆地 铀钼矿化 热液蚀变 成矿温度 复成因铀钼矿床 

分 类 号：P619.14[天文地球—矿床学] P598[天文地球—地质学]