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P.D.洛曼进行了如下评述:1 放射性衰变用来确定地球年龄;为地球的化学分异作用提供了一种独立的证据;由放射性衰变产生的热,为地质作用提供了另外一种新的内部能源。放射性示踪技术将放射性同位素和稳定同位素比值用作岩浆、气体和流体成因的证据。如~(87)Sr/~(86)Sr,Nd/Sm。2 地球的内部结构发现了地核,在大约2900km 的深度上地震波速度突然下降,整个内核呈固态,成分主
PD Lohmann made the following comments: 1 Radioactive decay is used to determine the age of the Earth; it provides an independent proof of the chemical differentiation of the Earth; and the heat produced by radioactive decay offers another new internal dimension to the geologic role energy. Radioactive tracing techniques use radioisotopes and stable isotope ratios as evidence of the origin of magmas, gases and fluids. Such as ~ (87) Sr / ~ (86) Sr, Nd / Sm. 2 The earth’s core was discovered by the Earth’s internal structure. At a depth of about 2900 km, the seismic velocity suddenly dropped and the entire core was solid.