Paleoearthquake Events and Formation of River Terraces in Active Anticline Region, Northern Piedmont of Tianshan Mountains , China
详细信息
- 责任者：Yang Xiaoping (National Center of Active Fault Studies ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Li An
- 刊名：Seismology and Geology
- 出版年：2011
- 卷期：33(4)
- 关键词：河流阶地 ; river terraces ; 古地震 ; paleoearthquakes ; 天山 ; Tianshan Mountains
- 页码：p.739-751
- 图表：5 illus., 1 table, 37 refs.
- 分类号：0500
- issnNo：ISSN0253-4967
- isbnNo：CN11-2192/P
摘要
Based on the field investigation, the authors find that all these terraces are pedestal terraces. The rock of pedestal is Pliocene mud rock, and on the top of each terrace pedestal are the stratums of sandy gravel or sandy clay with 2.5～15 m in thickness. The authors also performed dating using the 14C method to the samples from the deposit of terrace T1 of the Kuytun River. The results show that the ages of all these deposits are the later phase of the Late Pleistocene. The accumulation time of the upper stratum for T1, T2, T3, T5, T6 and T7 terraces is about 1.7 ka, 14.98 ka, 20.7～27.3 ka, 29.3～39.2 ka, 47～56 ka and 103～118 ka, respectively.