The River Terrace Response to the Connection of Hetao and Yinchuan Basins along the Gangdeer Mountains, North Ordos

CHEN Jun; ZHANG Ke; LIANG Hao; FU Jianli; LI Shubo

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The River Terrace Response to the Connection of Hetao and Yinchuan Basins along the Gangdeer Mountains, North Ordos

更新时间：2023-12-11

- The River Terrace Response to the Connection of Hetao and Yinchuan Basins along the Gangdeer Mountains, North Ordos
- Acta Scientiarum Naturalium Universitatis SunYatseni Vol. 53, Issue 6, Pages: 27-36(2014)
- 作者机构：
  
  1. 中山大学地球科学与地质工程学院∥广东省地质过程与矿产资源探查重点实验室,广东,广州,510275
  2. 
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2014，
  
  Published Online：25 November 2014，
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CHEN Jun, ZHANG Ke, LIANG Hao, et al. The River Terrace Response to the Connection of Hetao and Yinchuan Basins along the Gangdeer Mountains, North Ordos. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 53(6):27-36(2014)
DOI：

CHEN Jun, ZHANG Ke, LIANG Hao, et al. The River Terrace Response to the Connection of Hetao and Yinchuan Basins along the Gangdeer Mountains, North Ordos. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 53(6):27-36(2014) DOI：

摘要

鄂尔多斯西北缘岗德尔山地处黄河中游，介于河套和银川盆地之间，山体西侧广泛发育河湖相沉积构成的阶地，留下了更新世以来黄河贯通两盆地的记录，是解剖新构造运动和水系关系的典型区域。作者实地详细考察了岗德尔山西侧的构造与地貌，发现了被抬升成阶地的河湖相沉积层，揭示了阶地高度沿现今黄河显示出“低-高-低”的拱形特征，T-2阶地河湖相沉积层露头顶部和中部的光释光年龄分别为82.23±9.88 ka、116.76±11.41 ka，底部的电子自旋共振年龄为467±124 ka。阶地的时空分布特征表明，岗德尔山西侧中、晚更新世曾经存在过连接河套和银川两盆地的河湖地貌，岗德尔山沿着桌子山断裂带（主要是岗德尔山东麓断层）抬升的同时，山体还有向北扩展的趋势。由于构造抬升，湖泊缓慢萎缩，河流逐渐占优，留下了现今所见的两级河湖相阶地。研究揭示，银川与河套两盆地本已沟通，更新世构造抬升使两盆地之间的湖泊逐渐缩小，河流逐步壮大，最终形成现今所见的黄河。

Abstract

The Gangdeer Mountains

located in the northwest margin of the Ordos Plateau

is a key area for understanding the formation and evolution of the drainage system in response to neotectonic movement. Two terraces (T-1 and T-2) composed of fluviallacustrine deposits have been formed along the west piedmont of the Gangdeer Mountains. Dating of T-2 yields ages of 82.23±9.88 ka (OSL)

116.76±11.41 ka (OSL) and 467±124 ka (ESR) for the upper

middle and lower deposit cropout

respectively. The longitudinal profile of both terraces indicates an arch-form

high in the middle of the Gangdeer Mountains and low in the area adjacent to Hetao and Yinchuan basins

suggesting the effects of mountain uplift. Lakes coexisting with rivers in the Middle to Late Pleistiocene

gradually shrank as the Gangdeer Mountains were uplifted along the Zhuozi Mountains Fault Zone (mainly along the Eastern Piedmont Fault of Gangdeer Mountains) and the zone of uplift propagated northward. Eventually

the rivers gradually prevailed over the lakes

leading to formation of the Yellow River

and its two terraces and their fluvio-lacustrine deposits.

关键词

鄂尔多斯西北缘河流阶地新构造运动黄河河湖相沉积

Keywords

northwestern margin of the Ordos Plateauriver terraceneotectonicsYellow Riverfluvial-lacustrine deposit

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LIU Shangren

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College of Geographic Science and Planning，Sun Yatsen University

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