下庄矿田基底的控矿作用及其有关地质问题

本文提出武夷及其邻区存在两个裂陷槽及一裂隆，鹰潭－南城－安远－河源韧性断裂带为东部的火山岩型与西部的花岗岩型铀矿床的地质分界线，指出了加里东运动在本区的突出作用是使裂隆基底岩石发生混合花岗岩化作用。根据下庄矿田及其外围发现较深变质的岩石和较大规模韧性剪切糜棱岩带，得出下庄矿田是古老基底加里东热穹隆区多次构造、岩浆活动的产物。由于铀成矿作用赋存于初、脆性两种构造中，建议重新划分矿化类型以指导勘查工作。

THE BASEMENT CONTROL ON XIAZHUANG URANIUM ORE FIELD IN SOUTH SECTOR OF WUYI TUMESCENCE AND RELEVANT GEOLOGICAL PROBLEMS

Based on the two rift-trench tectonic framework in Wuyi as well as its adjacent areasproposed previously, this study takes Yingtan-Nancheng-Anyuan-Heyua tenacity fracturebelt as the geological boundary between two types of uranium deposits(granite and volcanicrock).It is noted that the distinct function of Caledonian movement in this area is the formation of the linear migmatization and granitization on the basis of rift and tumescence basement. Simultaneously, according to the new discovery of hypometamorphic rock and largescaled ductile mylonitized zone in Xiazhuang uranium ore field and its adjacent area,it is concluded that the Xizahuang uranium ore field is the result of multiple tectonism and magmaticactivations on the Caledonian hot dome on the basis of ancient basement. Because the uranium mineralization is present in two kinds of rocks (ductile and brittle),it is suggested thatthe types of mineralization in Xiazhuang can be considered renewably in order to guide thefurther prospecting.