铀系方法是用自然界中较短半衰期核素测定地质年龄的一种方法,原理上可以测到百万年以内,实际上最适应定年范围是40万年以内。它在新地质年代学中部分地填补了~(14)C和K-Ar法定年范围之间的空白。铀系年代学从三十年代中期应用过剩~(226)Ra测定喀拉海铁锰结核的生长速度到现在已有 The uranium-based method is a method of determining the geologic age using shorter half-life nuclides in nature. In principle, the uranium-based method can be measured within a million years. In fact, the most suitable dating range is within 400,000 years. It partially fills the gap between the ~ (14) C and K-Ar statutory years in the new geochronology. Uranium chronology From the mid-1930s the application of excess 226 Ra determination of the growth rate of iron and manganese in the Kara »