摘要
中国东南部地壳在中新生代时期演化具双重性特征,即早期为俯冲挤压阶段,晚期转为弧后拉张阶段,整体为俯冲挤压带,局部存在横向拉张环境。铀成矿赋存于双重拉张环境,形成于拉张阶段。其成矿模式为1.深循环上升热水—花岗岩,火山岩萃取,排泄区成矿模式;2.斑岩多重成矿模式,即斑岩+上升热流柱复合的成矿模式,后者是形成富、大铀矿床的主要成矿模式。
During Meso-Cenozoic period the crustal evolution in Southeast China was of dual features ie the early stage characterized by subduction-compression, and the late stage with prevailing back-arc tension. As a whole it was a subduction-compressional belt and locally there existed laterally tensional environment. Uranium mineralization occurs in a double tensional environment, and is formed in the tensional period. Two metallogenctic models are proposed: 1. deep-circulating ascending thermal water—extraction of uranium from granite and volcanics. It is the model for discharge areas; 2. Porphyry-related multigenetic model, i. e. porphyry plus ascending thermal plume. The latter is a main metallogenetic model for the formation of rich and large uranium deposits.
出处
《铀矿地质》
CSCD
北大核心
1992年第2期74-82,共9页
Uranium Geology
关键词
铀矿床
成矿环境
成矿模式
火山带
Laterally tensional rift, Back-arc tension, Metallogenetic model, Metallogenetic series
