黄河三门峡至扣马段的阶地序列及成因
收稿日期: 2008-01-26
修回日期: 2008-05-04
网络出版日期: 2008-07-25
基金资助
云南省科技计划项目(2007D199M); 国家自然科学基金(40462002; 40161002)
Sequences and Genesis of Yellow River Terrace from Sanmen Gorge to Kouma
Received date: 2008-01-26
Revised date: 2008-05-04
Online published: 2008-07-25
Supported by
Science and Technology Planning Project of Yunnan Province, No.2007D199M; National Natural Science Foundation of China, No.40462002; No.40161002
通过对黄河三门峡至扣马段的野外地貌调查, 结合黄土地层学、年代学分析, 发现黄 河在位于豫西断隆的三门峡至孟津段发育至少4 级阶地, 其形成时代由老到新分别为: 0.86 Ma BP、0.62 Ma BP、0.13 Ma BP 和0.05 Ma BP; 在位于华北断坳的孟津至扣马段仅发育 3 级阶地, 形成时代分别为: 1.24 Ma BP、0.25 Ma BP 和0.05 Ma BP。黄河各级阶地的河流 相沉积物顶部都有一层古土壤发育表明, 黄河下切形成阶地的过程发生在古土壤发育的间冰 期, 气候变化对阶地的形成有一定影响, 但是, 黄河流经豫西断隆和华北断坳两个抬升状况 差异较大的构造单元所表现出来的阶地序列和年代的迥然差异则证明了地面抬升也是控制黄 河阶地发育的重要因素。
苏怀, 王均平, 潘保田, 明庆忠, 史正涛 . 黄河三门峡至扣马段的阶地序列及成因[J]. 地理学报, 2008 , 63(7) : 744 -750 . DOI: 10.11821/xb200807008
Based on field and geomorphologic investigations, along with analysis of thermoluminescence (TL), magnetostratigraphy and loess-paleosol sequence on terraces, we found that at least four Yellow River terraces, whose ages are 0.86 Ma, 0.62 Ma, 0.13 Ma and 0.05 Ma, have been developed on west Henan fault-uplift system from Sanmen Gorge to Mengjin reach and but only three Yellow River terraces, whose ages are 1.24 Ma, 0.25 Ma and 0.05 Ma, have been developed on North China fault depression system from Mengjin to Kouma reach. All the terraces have similar structure that they have paleosols with a thickness of several meters developed on top of the fluvial silt. It shows that the Yellow River incised when terraces were abandoned during the transitional period from glacial to interglacial and there may be a link between the formation of terraces and glacial-interglacial climatic cycles. However, the differences in Yellow River terrace sequences between the two tectonic units, i. e., west Henan fault-uplift and North China fault depression, indicate that the land uplift has been playing an important role in the formation of these terraces.
Key words： Sanmen Gorge; Yellow River terrace; climatic change; land uplift
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