摩天岭地区古山体垮塌作用与铀成矿关系

在摩天岭地区,铀矿床产出在断陷带和岩体边缘的舌形凹陷带。这些地带为现代剥蚀物的堆积区,与现代地形汇水区关系密切。大量资料表明,成矿流体原始水为大气降水,赋矿构造为帚状构造。这些特征表明,古山体垮塌是造成铀成矿的主要原因,古垮塌体形成成矿前的含水体,为成矿流体提供原始水。本文阐述了摩天岭地区山体垮塌的几种类型,帚状构造的形成以及与铀成矿的关系。

Relationgship Between Paleo-Collapse of Mountain and Uranium Metallogenesis in Motianling Area,Guangxi

In Motianling area,uranium deposits occur in down-faulted zone and tongue-shaped depression zone near pluton margin,which are closely related to the accumulation zone of denudated modern materials and the water collection area of modern terrain.A lot of data shew that the ore-forming fluid was originated from atmospheric water and the ore-hosting structures are brush-shaped.These characteristics indicate that paleo-collapse of mountain is the main reason to cause uranium mineralization and paleo-collapse body produced the water-bearing bodies of the pre-mineralization,which provided original water for ore-forming fluid.This paper presented several types of mountain collapse and discussed the relationgship between the formation of brush-shape structure and uranium metallogenesis in Motianling area.