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铀-煤共生矿是在一定的地球化学环境中和地质条件下形成的。起初人们在褐煤层中发现铀矿化现象时,以为铀是被形成褐煤的原始植物吸收而进入煤层的。霍弗曼(Ho(?) fmann)曾为此调查过含铀地区和不含铀地区植物中的铀含量,结果表明,从不含铀地区收集的植物标本,其灰中铀含量非常低,即使生长在铀矿化土壤中的植物,其灰中的铀含量也只达到1ppm,个别情况下达到100ppm,可见植物吸收的铀量是很少的,褐煤中的铀不是来源于形成煤的植物,而是外来组分,铀-煤共生矿的形成是属于次生过程。
Uranium - coal symbiotic ore is formed in a certain geochemical environment and geological conditions. At first, when uranium mineralization was found in the lignite layer, uranium was absorbed by the original lignite-forming plant into the coal seam. For this purpose, Hovermann investigated the uranium content in plants containing uranium and uranium-free areas. The results showed that the uranium content of plant ash collected from uranium-free areas was very low, Even plants grown in uranium mineralized soils contain as little as 1 ppm uranium, and in some cases as little as 100 ppm uranium, and uranium from lignite is not derived from coal-forming plants , But the external components, uranium - coal symbiotic formation of the ore is a secondary process.