Discussion on the Epoch of Lacustrine Strata in Togtoh, Inner Mongolia
详细信息
- 责任者：Jiang Fuchu (Institute of Geomechanics ; Chinese Academy of Geological Sciences ; Beijing 100081 ; China) ; Fu Jianli
- 刊名：Journal of Geomechanics
- 出版年：2013
- 卷期：19(1)
- 关键词：更新世 ; Pleistocene ; 湖泊环境 ; lacustrine environment ; 地层对比 ; stratigraphic correlation ; 内蒙古 ; Inner Mongolia
- 页码：p.1-13
- 图表：illus., 4 tables, 25 refs.
- 分类号：1400
- issnNo：ISSN1006-6616
- isbnNo：CN11-3672/P
摘要
A set of later Quaternary fluvial-lacustrine strata is widely distributed in the Hetao region,which is compared with Salawusu Formation by predecessors.The Togtoh mesa is located in the east of the Hetao plain,and forms the geomorphic second platform.The lacustrine strata are well-exposed along the east bank of the Yellow River at the front edge of Togtoh mesa.The article mainly studied on the age of Haojiayao section and Haojiayao drill core section by lithological description as well as OSL and ESR dating methods.The emergence stratum of Haojiayao section is 47 m thick,the age at the top of lacustrine formation is about 106 kaBP,and the bottom is about 150 kaBP.Base on the lithological character,the Haojiayao drill core section can be divided to three parts: 0~12.77 m is a set of brownish yellow silty clay and clayey silt layers,which should be the Late Pleistocene Malan Loess,and its OSL age is 106~40 kaBP;12.77~70.23 m is a set of chartreuse,taupe silt and silty clay layers which should be lacustrine deposition,with OSL age being about 400~106 kaBP which belongs to Late Pleistocene;70.23~118.45 m is a set of brownish red silty clay layers with calcareous interlayers,that should be the eolian loess which was influenced by water,its ESR age is about 476~990 kaBP,and corresponds to the Middle Pleistocene Lishi Loess.The Togtoh lacustrine strata should not belong to the Salawusu Formation,because of the large differences between the age of classic Salawusu Formation and the Salawusu river basin which is about 75~150 kaBP.
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