华南产铀花岗岩的一种成因模式—递进部分熔融

本文建立了产铀岩体的递进部分熔融成因模式,研究了部分熔融过程中铀的地球化学性状和富集机理,阐述了递进部分熔融机制的找矿意义。该模式较好地解释了华南产铀花岗岩类所具有的一些地质地球化学特征,并认为有关岩浆型产铀花岗岩类系周围出露的富铀地层重熔而成的传统观念尚有值得推敲之处,指出富铀地层作为围岩与岩浆型产铀岩体的联系主要取决于花岗质熔体上侵和结晶演化过程中熔体中水的溶解度变化以及熔体对围岩的同化作用。

A GENETIC MODEL OF PROGRESSIVELY PARTIAL MELTING FOR URANIUM-BEARING GRANITES IN SOUTH CHINA

This paper has established a genetic model of progrcssively partial melting for uraniumbearing granites, studied geochemical chararcteristics and enrichment mechanism of uranium during partial melting of the sources of material, and also elaborated the significance of the genetic model in search of uranium deposits. This model better accounts for some geological and geochemical features of uranium-bearing granites and suspects the traditional idea that igneous uranium-bearing granites were formed by fusion of U-rich strata surrounding these granites. Finally this paper points out that the influence of U-rich strata of wall rocks of granites over uranium-bearing granites depends on variation of water solubility in the magma and assimilation of magma to wall rocks during its ascending and crystallization.