| 中国地洼区层控铀矿床地质和分布规律 |
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| 引用本文： | 姚振凯.中国地洼区层控铀矿床地质和分布规律[J].矿床地质,1982,1(1):83-89. |
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| 作者姓名： | 姚振凯 |
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| 作者单位： | 中南地勘局二三0研究所 |
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| 摘 要： | 我国地洼区分布广泛,其中层控铀矿床常见,它的形成是地壳大地构造单元受到多阶段构造演化及共伴随的多阶段成矿演化所致。本文所指层控铀矿床,是属一定地层、岩性和层间构造控制的矿床,因而是广义性的,它包括层状矿床和受层位控制的非层状矿床。但由于我国目前尚未发现沉积和成岩型层状铀矿床,故实际上又仅限于论述狭义的层控铀矿床。
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The distribution and geological characteristics of strata-bound uranium deposits in Diwa regions of China |
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| Abstract: | Following the theory of diwa established by Prof. Chen Guoda and taking the internal relations between the evolution of crust, of tectonicsand of mineralization into account, the author has made a comprehensive study of the strata-bound uranium deposits in the diwa regions of China.The study shows that strata-bound uranium deposits of China are mostly distributed in diwa region. They occur in geosynclinal, platformand diwa structural positions. The ores have ages of 135-2 m.y., chiefly 120-40 m.y, suggesting they were all formed during the middle-late period of tectonic and magmatic activities of diwa stage, a period xvhen Cretaceous-Tertiary red bed basins took shape and grew. Iri spatial distribution, the ore deposits are often related to granitic rocks or eruptive rocks of Indo-China and Yenshan periods as well as to Mesozoic and Cenozoic basins; in ore association, they are invariably accompanied by uranium, lead, zinc, molybdenum, mercury and other deposits of granitic or volcanic types. The time-spatial distribution of the strata-bound uranium deposits makes it clear that its genesis had a good deal to do with the evolution of the geotectonic units, i.e. from geosyncline to platform, then to diwa.The strata-bound uranium deposits in diwa regions have lots of features peculiar to themselves: occurring in various strata mineralizations from different sources adding to each other; superposition of mineralizations of several phases; multigenetic mineralizations with some of them playing the major role; being transitional to one another. In mineralization, only through gradual development and accumulation of ores of several phases can industrial uranium deposits be formed. This kind of deposits usually experienced in sequence three principal mineralization phases. |
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