• 兰州大学西部环境教育部重点实验室, 兰州 730000
范天来(1984-), 男, 博士研究生. E-mail: fantl2004@hotmail.com

收稿日期: 2011-03-07

  修回日期: 2011-03-22

  网络出版日期: 2011-05-20


973 项目(2010CB950202); 国家自然科学基金项目(40972116)

New Findings and Dating of Lacustrine Sediments in the Xishanzui Subuplift, Hetao Basin

  • MOE Key Laboratory of West China's Environmental Systems, Lanzhou Universsity, Lanzhou 730000, China

Received date: 2011-03-07

  Revised date: 2011-03-22

  Online published: 2011-05-20

Supported by

973 Project, No.2010CB950202; National Natural Science Foundation of China, No.40972116


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。


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


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/diluvial sediments). Optical dating results support that Xishanzui subuplift was actually covered by a deep water lake, potentially the Megalake "Jilantai-Hetao" at around 65 ka BP when the lake reached its highest level. And no lake level has exceeded the highest level inferred from sedimentary sequence in the profile.


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