Abstract:Based on the regional geological structure survey, geophysical data and remote sensing interpretation, using drilling, trenching and 14C chronology, we discuss and study the age, character and tectonic significance of the NE trending buried fault in Siping section of Yitong-Shulan fault zone. The results show that: 1) Siping section is mainly developed in the upper pleistocene felsic(including breccia) sand layer, and belongs to thrust nappe fault; 2) AMS14C dating results of arable soil layer, clay layer, argillaceous sandstone layer and felsic(including breccia) sandstone layer exposed by trenching and drilling are -70~6 270 BP、60~7 780 BP、110~21 780 BP、11 740~26 100 BP, respectively. The age of fault activity should belong to pre Quaternary (>26 100 BP); 3) Combined with regional magmatic tectonic and seismic events, the NE trending concealed fault zone exposed in this study may have been formed in the late Pleistocene.
YAN Donghan,XU Zhitao,XU Yueren et al. 14C Dating and Tectonic Significance of Siping Section of Yitong-Shulan Fault Zone[J]. jgg, 2022, 42(8): 835-839.