| 中国北方末次造貌期及环境变迁 |
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| 引用本文： | 闵隆瑞, 迟振卿. 中国北方末次造貌期及环境变迁[J]. 第四纪研究, 1998, 18(3): 256-261. |
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| 作者姓名： | 闵隆瑞 迟振卿 |
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| 作者单位： | 地质矿产部地质研究所, 北京 100037 |
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| 摘 要： | 1987年杨怀仁提出造貌运动一词,笔者进而将较新地质时期内最终形成现代地貌的一次运动时期称为末次造貌运动期(简称本次造貌期)。据中国北方几个大盆地、大平原和黄土高原的造貌剖析,认为末次造貌期主要发生在晚更新世晚期至全新世早期,其形式以缓慢的大面积的抬升(或下降)运动为主。在某些构造单元中,还受气候因素的影响。由于未次造貌期地质时期较新,与人类关系更为密切,故对其研究有较重要的意义。
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| 关 键 词： | 末次造貌期 环境变迁 |
| 收稿时间： | 1998-04-30 |
| 修稿时间： | 1998-05-24 |
THE LAST MORPHOGENISIS AND ENVIRONMENT CHANGES IN THE NORTHERN CHINA |
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| Min Longrui, Chi Zhenqing. THE LAST MORPHOGENISIS AND ENVIRONMENT CHANGES IN THE NORTHERN CHINA[J]. Quaternary Sciences, 1998, 18(3): 256-261. |
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| Authors: | Min Longrui Chi Zhenqing |
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| Affiliation: | Institute of Geology, Ministry of Geology and Mineral Resources Beijing 100037 |
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| Abstract: | The modem landscapes consist mainly of uplifting mountains, plateaus, low basins,plains and oceans. The formings of these landscapes are complex and have undergonethrough different developing periods. The last morphogenisis and the environmentchanges of several basins, plains and loess plateau in the northern China are discussed.1 Implication of last morphogenisis The movement after geosynclinal inversion is generally regarded as the last orogenicmovement. In 1987, Yan Huairen put forward the concept of morphogenisis andsuggested using it to replace late orogenic movement. We suppose that morphogenisismainly refers to the movement which happens during formation of modem landform.We regard the movement building the last morden landscapes eventUally during arelatively late geological period as last morphogenisis.2 The last morphogenisis of basins and plains in the northern China and analysisof its environment（1） Tarim Basin The coarse deposits along the margin of the Tarim Basin,relating to the uplifting of the Qnghai-Xizang Plateau belongs to Xiyu group of EarlyPleistocene , whereas, the ancient Taklamakan desert began tO form in the basininterior since early Middle Pleistocene. The scene consisting of large sand knap （highabout 50～150m） in desert interior developed relatively late. The last morphogenisisperiod of the Taklamakan desert is suPPosed from fare Late Plistocene to EarlyHolocene by analyzing the low-land face which serves as aeolian base level amongsand knap.（2） Qaidarm Basin The Qaidarm Basin was a united lake basin in Tertiary time and it began to fold as well as to uplift in northwest and to subside in southeastin Early or Middle Pleistocene . The lake began to differentiate and water becomesalted. The violent tectonic movement and extra-arid climate made the lake shrinkrapidly and turn to dry salt lake from late Late Pleistocene to Middle Holocene,which should be the late morphogenisis Period of the Qaidarm Basin.（3） Loess Plateau ms area as a Peneplain state before late Tertiary periodbegan to downgo broadly and accumulated Hippurion red clay during Pliocene. Northpart of the area uplifted on one occasion and south part still downwent inEarly-Middle Pleistocene . The Loess Plateau uplifted as a whole by a big marginafter Salawusu groups accumulating in Late Pleistocene. After that today's plateaufeature is formed. Therefore, the late Late Pleistocene is the last morphogenisis of theLoess Plateau.（4） Hetao Plain Lake faCe sediment with developed mirabilite ore intercalatedbed depositing in the basin in Early or Middle Pleistocene was superseded by riverface sediment. In late Middle Pleistocene as well as, the basin was filled upgradually and transformed into the Hetao Plain. So the late Middle Pleistocene is thelast morphogenisis of Hetao Plain.（5） Song-Liao Plain The Songnen Plain as a united big lake in Early orMiddle Pleistocene could be divided into the eastern high plain and the western lowPlain after Middle Pleistocene. The submergence of the Sanjiang Plain and theXialiaohe Plain and the forming of the Song-Liao topographic divides establishedpresent hydrological network in northeastern China in Late Pleistocene. So LatePleistocene is the last morphogenisis of the Song-Liao Plain.（6） North China Plain The North China Plain took embryonic formation inTertiary period and developed river and lake face sediment in Early or MiddlePleistocene. However, the North Jiangsu Plain was a independent system at that bine.In Late Pleistocene , relatively large scale ingression occured, and the range of theYellow caver alluvial-pluvial fan expanded, then the North China and the NorthJiangsu Plain united to one. Therefore, Late Pleistocene is said tO be the lastmorphogenisis of the North China Plain.（7） Bohai Sea According to relevant data material, limnetic facies sedimentaccumulated and desertization took along the shelf in late Late Pleistocene to EarlyHolocene. So, Early Holocene is thought to be the last morphogenisis of the BobalSea.3 ConclusionThe late morphogenisis of basins, plains a |
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| Keywords: | last morphogenisis environment change |
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