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从大多数产在中心式火山构造中的铀矿床实例来看,铀矿化与环状断裂的关系极为密切。笔者在实际工作中,通过对中心式火山环状断裂形成机理的概略分析,探讨它们在铀成矿过程中所起的作用和铀矿床(体)的一些分布规律,供读者参考。一、中心式火山环状断裂的形成机理中心式火山构造主要分为火山穹隆构造和火山洼地构造两大类。本文所述的中心式火山环状断裂,系指由火山作用形成的围绕中心呈环状或半环状(弧状)分布的断裂构造。现将其形成机理概述于下。
From the case of most uranium deposits, which are produced in central volcanic structures, the relationship between uranium mineralization and annular faults is very close. In the actual work, the author analyzes the formation mechanism of central volcanic ring-shaped faults, and discusses their roles in uranium mineralization and some distribution rules of uranium deposits (for reference). Cenozoic volcanic ring-shaped fault formation mechanism Center-type volcanic structures are mainly divided into volcanic dome structure and volcanic depression structure two categories. Cenozoic volcanic ring faults, as used herein, refer to fault structures formed by volcanism distributed in a ring or semi-circular (arc) distribution around the center. The formation mechanism is summarized below.