临潼-长安断裂上断层崩积楔光释光测年的探讨

Discussions of Optical Stimulated Luminescence Dating about Colluvial Deposits in Lintong-chang'an Fault

选择西安临潼-长安断裂带上韩峪乡范家村剖面的一个典型崩积楔样品进行测试,用3种不同的释光测试方法测出了9个不同的年龄数据。根据地层信息和矿物的释光生长曲线确定只有采用混合矿物简单多片再生法、纯石英矿物简单多片再生法以及纯石英矿物单片再生法的光释光测年法所得结果更接近于崩积楔的真实年龄。这些断层崩积楔年龄接近于围岩的形成年龄,并不能代表真正意义上的断层活动时代。因此,断层崩积楔年龄光释光测年结果无法给出该断层最真实的活动时代。

This article choosed Fanjiacun profile in Lintong-chang＇an fault as a typical fault gouge samples testing and used three different methods to obtain nine different age data.According to stratum information and minerals luminescence growth curve,the paper determined only three dating method.They are mixed minerals multiple aliquot regenerative dose protocol,fine grained quartz multiple aliquot regenerative dose protocol and fine grained quartz single aliquot regenerative dose protocol.These fault wedge ages are close to collapse product of surrounding rock formation age but can＇t represent real fault activity era.So we conclude that optical stimulated luminescence age results of colluvial deposit can＇t give real activity age about fault.