The Wanchuan River,which is a small tributary of the Huanghe(Yellow) River,has developed four staircases of river terrace at least within Yuzhong Basin.Based on "Paleosol-dating",combining OSL dating and 14C dating,we demonstrate that the beginning ages of incision of T4,T3,T2 and T1 were 330 ka,130 ka,50 ka and 10 ka,respectively.Analysis of regional geological structure and terrace feature indicates that tectonic uplift has not played significant role in river incision,and the Huanghe River,the base level of Wanchuan River,has influenced only a short segment of downstream of the river.The paleosal developed on the surface of each river terrace indicates that river incision began in the period during climate transformation from dry cold phase to humid warm phase,when the paleosal development began in the Loess Plateau,so the main cause of river incision is climate change.
HU Xiao-Fei, PAN Bao-Tian, SU Huai, AN Chun-Lei, ZHOU Tian
. Terrace Formation Age and River Incision Mechanism of Wanchuan River[J]. SCIENTIA GEOGRAPHICA SINICA, 2007
, 27(6)
: 808
-813
.
DOI: 10.13249/j.cnki.sgs.2007.06.808
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