Sequences and genesis of the Yellow River terraces from Sanmen Gorge to Kouma  

黄河三门峡至扣马段的阶地序列及成因(英文)

作　　者：苏怀 王均平 潘保田 明庆忠 李琼 

机构地区：[1]College of Tourism and Geography Sciences,Yunnan Normal University [2]College of Resource,Environment and Tourism,Capital Normal University [3]College of Resources and Environment,Lanzhou University

出　　处：《Journal of Geographical Sciences》2009年第3期351-358,共8页地理学报（英文版）

基　　金：Science and Technology Planning Project of Yunnan Province,No.2007D199M;National Natural Science Foundation of China,No.40462002;No.40161002

摘　　要：Based on field landscape investigations, thermoluminescence （TL）, magnetostratigraphy and Ioess-paleosol sequence, we found that there are at least four Yellow River terraces, whose ages are 0.86 Ma, 0.62 Ma, 0.13 Ma and 0.05 Ma, in Yuxi Fault-Uplift （from Sanmen Gorge to Mengjin） and at least three Yellow River terraces, whose ages are 1.24 Ma, 0.25 Ma and 0.05 Ma, in Huabei Fault Depression （from Mengjin to Kouma）. All the terraces have a similar structure that several meters of paleosols directly develop on the top of fluvial silt. It shows that the Yellow River incised and consequently abandoned floodplain converted to terrace during the interglacial period. Therefore, there may be a link between the formation of terraces and glacial-interglacial climatic cycles. However, the differences in the Yellow River terrace sequences and ages between Yuxi Fault-Uplift and Huabei Fault Depression indicate that the surface uplift should play an important role in the formation of these terraces.Based on field landscape investigations, thermoluminescence （TL）, magnetostratigraphy and Ioess-paleosol sequence, we found that there are at least four Yellow River terraces, whose ages are 0.86 Ma, 0.62 Ma, 0.13 Ma and 0.05 Ma, in Yuxi Fault-Uplift （from Sanmen Gorge to Mengjin） and at least three Yellow River terraces, whose ages are 1.24 Ma, 0.25 Ma and 0.05 Ma, in Huabei Fault Depression （from Mengjin to Kouma）. All the terraces have a similar structure that several meters of paleosols directly develop on the top of fluvial silt. It shows that the Yellow River incised and consequently abandoned floodplain converted to terrace during the interglacial period. Therefore, there may be a link between the formation of terraces and glacial-interglacial climatic cycles. However, the differences in the Yellow River terrace sequences and ages between Yuxi Fault-Uplift and Huabei Fault Depression indicate that the surface uplift should play an important role in the formation of these terraces.

关 键 词：Sanmen Gorge Yellow River terrace climatic changes surface uplift 

分 类 号：P597.3[天文地球—地球化学]