白鹿塬中更新世以来的黄土—古土壤序列及断层活动特征分析

Preliminary Study on Loess-paleosol Sequence and Fault Activity Feature since Middle Pleistocene in Bailuyuan Area

通过对白鹿塬高家沟内两套黄土—古土壤序列及断层错距的观察、测量和分析,获得了中更新世以来白鹿塬黄土—古土壤序列的地层划分和断层的部分活动性参数。结果表明:高家沟内S2和S3地层均由两层古土壤夹一层黄土复合而成,L7地层由两层黄土中间夹一层弱发育古土壤组成;中更新世以来,白鹿塬段一直存在断层活动,且断层活动具有空间差异性。

Based on the observation,measurement and analysis of two loess-paleosol sequences and fault dislocation in Gaojiagou,Bailuyuan,we obtain stratigraphic division of loess-paleosol sequences and some parameters of fault activity since Middle Pleistocene.The results show that the stratum of S2 and S3 both consist of two layers of paleosol with one layer of loess between them,and the stratum of L7 consist of two layers of loess with one layer of not development paleosol between them in Gaojiagou.Fault activities with spatial difference are always exist in Bailuyuan since Middle Pleistocene.