下庄矿田构造岩浆演化与富铀成矿作用初探

Preliminary discussion on tectonic-magmatic evolution with respect to metalloginesis of rich uranium deposits in Xiazhuang ore-field

本文阐述了下庄矿田的区域构造背景和该矿田的主要地质特点 ,认为下庄矿田构造主要特征表现为浅层次热隆伸展构造 ,提出浅层次热隆伸展构造岩浆演化的特定条件下 ,控制富大矿床的产出和分布 ,以及裂陷伸展构造岩浆演化控制晚期富大铀矿的形成和分布。在此基础上 ,确定了下庄矿田富大铀矿的成矿模式 ,并预测 4片富大铀矿成矿远景区。

The regional tectonic setting and main geologic features are described in this paper.It is suggested that Xiazhuang ore-field is characterized by shallow thermo-upwelling extensional tectonics,and the occurrence and the distribution of rich-large uranium deposits are controlled by the specific tectonic-magmatic evolution under shallow thermo-upwelling extensional tectonics,and those of late-stage rich-large uranium deposits are constrained by the tectonic-magmatic evolution of taphrogenic extensional tectonics.On the above basis,a metallogenic,model for rich-large uranium deposit has been set up,and four metallogenically prospective areas for rich-large uranium deposits have been predicted.