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铀-钍-铅法是最早用来测定地质年龄的放射性方法之一。在一九○七年加拿大学者波尔特伍德就开始利用铀的放射性衰变规律进行矿物年龄测定的研究,他根据铀的衰变速率和铀矿物中铀、铅的含量计算矿物的年龄,建立了化学铀-铅法(称粗铅法)。一九三五年尼尔用改进的质谱计分析了铀、钍、铅的同位素组成后,建立了同位素铀-钍-铅法。许多学者对影响年龄的因素进行了广泛深入地研究,进一步改进了铀、钍、铅的测定技术,同时研究了数据处理方法,使铀-钍-铅法的应用范围迅速扩大。 铀-钍-铅法既适用于古老岩体和矿物的年龄测
Uranium - thorium - lead method is one of the earliest radioactive methods used to determine geological age. In 1907, Canadian scholar Porterwood began to study the age determination of minerals by the law of radioactive decay of uranium. He calculated the age of minerals according to the decay rate of uranium and the content of uranium and lead in uranium minerals, and established the chemical Uranium - lead method (crude lead method). After Neil analyzed the isotopic composition of uranium, thorium and lead with a modified mass spectrometer in 1935, an isotope uranium-thorium-lead method was established. Many scholars have conducted extensive and in-depth research on the factors influencing age and further improved the determination of uranium, thorium and lead. At the same time, the methods of data processing were studied and the application range of uranium-thorium-lead method was rapidly expanded. Uranium - thorium - lead method is suitable for the age of the ancient rock and minerals