中南4省(区)产铀层基本特征及其与铀成矿的关系

BASIC CHARACTERISTICS OF U-PRODUCING BEDS IN 4 PROVINCES (REGION) OF CENTRAL SOUTH CHINA AND ITS RELATIONSHIP WITH AND U METALLOGENY

豫鄂湘桂省(区)共有个产(富)铀层组,主要有上震旦统—下寒武统、中泥盆449统,下二叠统及上白垩统。其时空分布与地壳演化有关,受特定的构造旋回和大地构造单元控制。岩性为一定地质时期形成的海相碳硅泥岩建造和河流—滨湖三角洲相砂岩建造。富铀层往往是极重要的铀源层及良好的储铀层。产(富)铀层的岩性序列组合,岩石的化学和物理性质及构造—岩浆作用的叠加,严格控制着铀矿化的形成和富集。

There are total 49 U-producing (or U-enriching) beds Henan, Hubei, Hunan, Guangxi, which mainly occur in Upper Sinian-Lower Cambrian Series, Middle Devonian Series, Lower Permian Series and Cretaceous Series. The period and space distribution of the U deposits is relationship with crust evoluation and is controlled by specific tectonic cycle and geotectonic units. Lithizone was established by marine facies carbon-siliceous mudrock and sandstone at delta of river or lake in some geological period. U-enriching beds always are the important beds of U source and storing up Uranium. The formation and enrichment of U-ores were strictly controlled by the lithic sequence combination of U-producing (or U-enriching) beds, physical and chemical property of rock, and superimposed action of tectonism and magmatism.