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对采自十八顷毫金矿区的黑云母、角闪石用阶段升温法进行40Ar／39Ar年龄谱研究，结合矿区地质特征，认为黑云母近似直线年龄谱的坪年龄（277Ma）及角闪石稳定坪年龄（288Ma）代表了韧性剪切带最新活动的时代；角闪石矿物年龄谱反映的后期热扰动（268Ma）反映区域退化变质作用发生的时代，269～277Ma的年龄可能代表了与退化变质同时的金矿化时代。
The 40Ar / 39Ar age spectrum of biotite and hornblend from hornbeam area of Eighteen areth mine is studied by 40Ar / 39Ar age spectrum. Combined with the geology characteristics of the mining area, it is considered that the age (277Ma) The age of stable lithosphere (288 Ma) represents the age of the latest activity of ductile shear zone; the post-thermal disturbance (268 Ma) reflected by the age spectrum of amphibole mineral reflects the era of regional degeneration and metamorphism, and the age of 269-277 Ma may represent the Degeneration and deterioration of the same era of gold mineralization.