中国晚震旦—古生代海相含铀碳硅泥岩沉积建造及主要含铀层

中国海相碳硅泥岩含铀沉积建造中产有重要铀矿床。这些建造是:地台区(或准地台区)及构造过渡区稳定型及过渡型含铀建造;地槽区活动型含铀建造。属前者的有中国各地台边缘及其相邻构造带中,发育在前寒武基底之上的,震旦-寒武纪以炭质页岩和碳硅泥岩过渡型沉积为主的含铀建造,以及发育在加里东褶皱基底之上的以碳酸盐沉积为主的晚古生代含铀建造。活动型含铀建造主要有发育于加里东冒地槽沉积区的寒武-志留纪炭质页岩、炭硅质页岩建造及早中志留世硅质岩建造及碎屑岩-硅灰质岩建造。文中还评述了我国碳硅泥岩主要含铀层的分布及其意义。

LATE SINIAN-PALAEOZOIC URANIUM-BEARING CARBONATE-SILICEOUS-PELITIC SEDIMENTARY FORMATIONS AND MAIN URANIFEROUS STRATA IN CHINA

Important uranium deposits occur in uranium-bearing marine carbonate-siliceous-peliticsedimentary formations in China. These formations include: (1) uranium-bearing formationsof stable and transitional types in platforms (or paraplatforms) and tectonic transitional re-gions; and (2) uranium-bearing formations of mobile type in geosynclines. The first onescontain: (1) Sinian-Cambrian uranium-bearing formations mainly composed of carbonaceousshales and carbonate-siliceous-pelitic transitional sediments. They are located in the ma-rgins of platforms and their adjacent transitional tectonic zones in China and developedon the Precambrian basements; and (2) Tate-Palaeozoic uranium-bearing formations deve-loped on the Caledonian folded basements and consisting mainly of carbonate deposits. Theuranium-bearing formations of mobile type mainly include Cambrian-silurian carbonaceousshale and carbonaceous siliceous shale formations, Early and Middle Silurian silicalite for-mations as well as detrital siliceous-calcareous formations developed in the Caledonian miogeo-syncline sedimentary regions. The distribution of main uraniferous carbonate-siliceous-pe-litic strata in china and their significance are aiso discussed in this paper.