华南诸广山岩体铀成矿条件及成矿潜力分析

Zhuguangshan Rock Mass Uranium Metallogenic Conditions and Potentiality Analysis in South China

诸广山岩体是我国华南地区重要的产铀岩体之一,铀矿床可分为岩体内带型、岩体外接触带浅变质岩型和岩体外带上叠红盆型,诸广岩体与该三种成矿类型有着密切的成因关系。诸广山地区在铀源、热液运移、成矿空间、富集保存方面具有很好的成矿地质条件。因此,该岩体具有很好的铀成矿潜力,其中多期次岩浆活动发育区(尤其是有晚期酸性小岩体及基性岩脉发育地区),断裂构造繁杂区,不同期次岩体接触带以及岩体侵入震旦-寒武系形成的热变质带,多期次蚀变叠加区等地段有利于铀成矿。据此,岩体中段的三九地区和北段的桂东地区是重要的找矿远景区,已知矿床深部和矿田外围有利成矿地段应为下一步找矿突破地段。

The Zhuguangshan rock mass is one of major uranium production rock masses in south China. The uranium deposits can be partitioned into rock mass interior band type,external contact zone epimetamorphic rock type and outer band superimposed red basin type,while Zhuguangshan rock mass has close genetic relationship with all three metallogenic types. In the Zhuguangshan area has good metallogenic geological conditions on aspects of uranium source,hydrothermal migration,metallogenic space,enrichment and preservation. Thus the rock mass possesses excellent uranium metallogenic potentiality,in which,multiphase magmatic activity developed areas(especially with late acidic small rock mass and basic dike developed areas),faulted structure complex areas,different phases rock mass contact zone and rock mass intruded into Sinian-Cambrian strata formed thermometamorphic zone,and multiphase alteration superimposed areas are propitious to uranium metallogenesis. Accordingly,the rock mass middle sector Sanjiu area and north sector Guidong area are important prospecting prospects,known deposit deep part and minefield periphery beneficial metallogenic sectors should be next prospecting breakthrough areas.