中文摘要：

粤北下庄矿田是以“希望矿床”为代表的典型华南花岗岩型铀矿产地.最新LA-ICP-MS测定显示,赋存铀矿的下庄岩体年龄为（245.4±6） Ma,帽峰岩体年龄（227.1±5） Ma,矿田内呈NWW向分布的基性岩脉的年龄为（193±4） Ma.华南地区强烈的印支期陆内造山作用使富含铀元素的前寒武系古陆壳重熔,形成了富含铀元素的花岗岩,受深断裂控制岩体呈近EW向展布.燕山期矿田内NWW向断裂活动提供了流体;NEE向构造体系控制了下庄矿田基本构造格局,并为深部流体运移提供通道.NNE向构造体系及其伴生的次级构造直接控制了矿床、矿体的空间分布.矿体形态受断裂构造控制多呈侧列状、透镜状、串珠状.在矿田南部受NWW和NNE向联合构造控制而形成“交点型”铀矿.

英文摘要：

Represented by the ＂Xiwang＂ deposit,Xiazhuang uranium ore-field in northern Guangdong province is the typical granitic uranium producing area in South China.The latest LA-ICP-MS dating reveals that the uranium-bearing Xiazhuang and Maofeng plutons emplaced respectively in （245.4 ± 6） Ma and （227.1 ± 5） Ma while the NWW trend basic dikes in （193 ±4） Ma.Research shows that pre-Cambrian old continent crust,rich in uranium,remelted during Indo-Chinese intracontinental Orogeny in South China,and thus applying volumes uranium for later metallogenic activities,influenced by the deep faults the plutons distribute in EW direction.The NWW faults activities in Yanshanian Epoch provide redox fluid and hydrothermal solution.The NEE-trend structures control the basic framework of the ore-field and applying channel for the deep fluid.The NNE-trend and its secondary structures directly control the spatial distribution of ore-deposits and ore-bodies.Controlled by the fault structure,the ore bodies are usually in a side line,or in lenticular/varicose shape.In the south of the ore-field,the ＂intersection＂ uranium ore-deposits are influenced by the NWW and the NNE-trend structure.