河套盆地西山咀凸起区湖相地层的发现及其测年

doi:10.11821/xb201105012

摘要/Abstract

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

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/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.

Key words: lacustrine sediments, optical dating, Xishanzui subuplift, Hetao Basin, Quaternary

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.

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.

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