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| 河套盆地西山咀凸起区湖相地层的发现及其测年 | |
| 引用本文： | 范天来,范育新,魏国孝. 河套盆地西山咀凸起区湖相地层的发现及其测年[J]. 地理学报, 2011, 66(5): 698-708. DOI: 10.11821/xb201105012 |
| 作者姓名： | 范天来 范育新 魏国孝 |
| 作者单位： | 兰州大学西部环境教育部重点实验室, 兰州 730000 |
| 基金项目： | 973项目，国家自然科学基金项目 |
| 摘 要： | 在位于河套盆地内部的西山咀凸起区发现了典型的湖滩岩、湖蚀平台和一套较完整的湖相沉积地层。基于海拔高程的推断，地貌和地层沉积记录指示西山咀地区曾经存在过一个海拔达到1080 m上下的古湖面。完整的沉积地层反映西山咀凸起区经历了深湖相-滨湖相-冲洪积相-风成堆积的演变过程。光释光测年结果表明，在距今65 ka 前后，“吉兰泰-河套”古大湖在西山咀地区曾经连通；但在距今约50~30 ka 湖面再没有上涨。这一研究表明：在MIS 3 阶段某一时期，该地区的古湖面发生衰退。随后，再没有发育高于“吉兰泰-河套”古大湖最高湖面的湖泊。 |
| 关 键 词： | 湖相沉积 光释光年代 西山咀凸起区 河套盆地 第四纪 |
| 收稿时间： | 2011-03-07 |
| 修稿时间： | 2011-03-22 |
New Findings and Dating of Lacustrine Sediments in the Xishanzui Subuplift, Hetao Basin |
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| FAN Tianlai,FAN Yuxin,WEI Guoxiao. New Findings and Dating of Lacustrine Sediments in the Xishanzui Subuplift, Hetao Basin[J]. Acta Geographica Sinica, 2011, 66(5): 698-708. DOI: 10.11821/xb201105012 | |
| Authors: | FAN Tianlai FAN Yuxin WEI Guoxiao |
| Affiliation: | MOE Key Laboratory of West China's Environmental Systems, Lanzhou Universsity, Lanzhou 730000, China |
| Abstract: | A complete sedimentary profile composed mainly of typical lacustrine sediments including beachrock and cut-and-built platform located in the Xishanzui subuplift, Hetao Basin, has been found. The geomorphological and stratigraphic evidence indicates that there was a paleolake with its highest lake up to 1080 m a.s.l. Stratigraphic analysis of the profile indicates that this subuplift experienced an environmental change from a deep lake to a shallow lake and then to non-lake environment (suggested by alluvial... |
| Keywords: | lacustrine sediments optical dating Xishanzui subuplift Hetao Basin Quaternary |
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