Abstract: The ages of 1Md illite (<1μ size fraction), quartz(2-10μ size fraction), and apatite in fault gouge from Yi-Shu fault zone were determined by K-Ar, TL and FT techniques, separately. Three distinct episodes of fauting as represented by the gradual decrease of temperature-sensitivity of TL, FT and K-Ar systems have been recognized. The K-Ar ages(90-110Ma) are obtained from seven IMd illites considered to represent the best approximation of the earliest strong activity of the fault zone as the same as geological evidence. They can be further divided into two stages, i. e. 110Ma for the eastern Fault(F₁), and 90-95 Ma for the western Fault (F₂, F₂ and F₄). The FT ages (30-56Ma) of four apatite samples probably represent the second episode of strong activity of the fault zone, while the TL ages (40-50Ka) of five quartz samples may represent the latest episode.It is suggested that the K-Ar, FT and TL separate dating of 1Md illite, apatite and quartz from fault gouge can be used to reveal the development history of faulting, including time and intensity.

Key words: Yi-Shu Fault zone, Fault gouge, K-Ar, TL and FT dating, Age of faulting

摘要： 本文报道了利用K-Ar法、TL法和FT法,分别测定断层泥中1Md伊利石(<1μ粒级组份)、石英(2-10μ粒级组份)和磷灰石单矿物的年龄结果;给出了沂沭断裂带三次强烈活动的年龄区间及强度逐渐减弱的变化趋势。首先提出了利用这三种测年手段,测定断层泥中三种不同物质的年龄,进而研究断层活动(强度和时间)的新方法。

关键词: 沂沭断裂带, 断层泥, K-Ar、TL和FT测年, 断层年龄