摘要
利用４０Ａｒ／３９Ａｒ中子活化定年法测试大水沟碲矿床１２号矿脉中的白云母，得到阶段升温坪年龄９２１０～９４１０Ｍａ，等时线年龄９３７０Ｍａ。
The Dashuigou tellurium deposit is, up to now, unique and is discovered in 1992. Its forming ages of 80 1Ma to 149Ma were got before through measurement of muscovite from the ore vein by K_Ar method. However, due to the lost of radisactive argon and the exist of surplus argon. the ages measured by K_Ar method tend to be older or youger. In this case, we date the muscovite taken from the No 12 ore vein by 40 Ar/ 39 Ar dating method. We got an age spectrogram of 92 10±10 6Ma in average from 400℃ to 1400℃ and an isochron of 93 70±3 44Ma, Which reflect the ore_forming time.
