早元古代连山关铀矿床的地质地球化学特征

本文对著名的连山关铀矿床的地质地球化学特征进行了研究,并探讨了矿床成因,划分了两种不同成因的矿体:沉积变质型和碱交代热液脉型,其同位素年龄分别为2085.6Ma和1974.8Ma。矿床的工业铀矿物以沥青铀矿、晶质铀矿为主。矿床属多阶段复成因铀矿床,以中高温碱交代热液成因为主。矿床铀源主要来自连山关岩体,铀的活化转移与碱交代作用有关。

GEOLOGICAL AND GEOCHEMICAL FEATURES OF THE EARLY PROTEROZOIC LiANSHANGUAN URANIUM DEPOSIT LIAONING PROVINCE, NORTHEAST CHINA

In this paper geological and geochemical features of Lianshanguan uranium deposit are studied and the genesis of the deposit is also discussed. Two genetic types of uranium mineralization can bc classified: sedimento-metamorphic type and alkalinc hydrothermal vein tyPe. The U-Pb isotopic ages are 2085.6Ma and 1974.8Ma, respectively. Uranium minerals of economic signiicance are pichblende and uraninite, coffinites in minor amount are also found. The orebodies are Iccalized in alkali metasomatites and uranium mineralization was controlled by alkali metasomatism in time and space It belongs to a uranium depcsit of multiple stages and geneses mainly of middle-high temperature alkali metasomatism hydro-thermal origin. Uranium source in.the deposit is PrinciPally derived from the Lianshanguan massif and mobilization and migration of uranium are related to alkali metascmatjsm.