Measurement of geologic time, as through isotopic radioactive decay.
地质年代测定通过放射性同位素衰变来测定地质年代
The chronology of the earth's history as determined by geologic events.
地质年代学以地质事件测定的地质历史年代学
isotopic age determination
同位素地质年龄测定
Various geochronometric methods have been applied to dating of important geologic events in complex Archean terranes.
在复杂的太古代地体的重要地质事件定年中已采用了多种地质年龄测定方法。
a geological age, formation
地质年代、 结构.
Fission track dating of Cenozoic strata in Linxia Basin
临夏盆地新生代地层裂变径迹年龄测定
DETERMINATION OF ~(129)I AGES FOR GROUNDWATER WITH SUPERSENSITIVE ACCELERATOR MASS SPECTROMETRY(AMS)
超灵敏加速器质谱计测定地下水~(129)Ⅰ年龄方法
radioactive dating
ph.1. 【美】放射性测定年代
electron paramagnetic resonance dating
电子顺磁共振年代测定
radiocarbon method
放射性碳测定年代法
leadalpha age method
铅-α粒子年代测定法
radiation-damage dating
辐射损伤年代测定法
beta radiography dating
射线照相法测定年代
spontaneus fission dating
自然裂变年代测定法
Forming Ages of Early Precambrian Metamorphic Strata in Shandong Province--Proofs of Zircon SHRIMP U-Pb Dating
山东早前寒武纪变质地层形成年代——锆石SHRIMP U-Pb测年的证据
Its diameter is about3000 meters, and the depth is250 meters.
它的直径约3000米，深约250米；据同位素地质年龄测定约七千万年。
standard global geochronologic scale
标准世界地质年代表
Rb-Sr AGE DETERMINATION ON THE LATE ARCHEAN FERROSILICEOUS ROCK SERIES IN SIJIAYING,LUANXIAN,HEBEI
河北滦县司家营晚太古代铁硅质岩系的铷-锶同位素年龄测定