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Sediment sequences and paleosols in the Kyichu Valley, southern Tibet (China), indicating Late Quaternary environmental changes
Kaiser, Knut1; Lai, Zhongping2; Schneider, Birgit3; Schoch, Werner H.4; Shen, Xuhui5; Miehe, Georg1; Brueckner, Helmut1
2009-09-01
发表期刊ISLAND ARC
卷号18期号:3页码:404-427
文章类型Article
摘要P>The Tibetan Plateau is highly sensitive to environmental changes and affects the settings of a far larger territory in Central Asia and beyond. Thus, knowledge on past environmental changes in that area is essential. Even though the Kyichu (Lhasa River) Valley and its tributaries is an easily accessible area, the Late Quaternary landscape evolution of southern Tibet is in general scarcely known. Therefore, 12 sedimentary sections in the middle and lower catchment were subjected to multidisciplinary analyses (sedimentology, paleopedology, AMS (14)C and luminescence dating, and charcoal determination) aiming at results on regional paleoenvironmental changes. At the altitude studied (3600-4000 m above sealevel), no glacial relics could be detected, indicating that the valley positions have been unglaciated since the Last Interglacial. The lack of fluvial-lacustrine structures above the floodplain is due to the aggradational character of this tectonically (sub-)active valley, which caused an alluvial burying of older valley bottoms. During the Late Pleistocene the mouth area of the Kyichu was occupied by a lake which was part of a larger dam-lake in the superordinate Yarlung Zhangbo Valley. On the valley flanks, loesses were predominantly deposited before the Last Glacial Maximum (LGM), whereas eolian sands were predominantly deposited around and after the LGM. Paleosols of Last Interglacial, Last Glacial and Holocene ages regularly occur at terrestrial sites representing temperate to cool and humid to semiarid conditions during soil formation. Ages of colluvial sediments indicate that the widespread barren valley slopes were primarily formed by Late Pleistocene erosion followed by a secondary Holocene erosion phase. Charcoal spectra indicate a Late Holocene change from a forest environment to a pastoral environment with sparse grasses, herbs and dwarf shrubs. It is assumed that the Late Holocene environmental changes, such as loss of forests/woodlands and erosion, have at least been reinforced by humans, enhancing a regional climatic aridification and cooling trend.
关键词Colluvial Eolian Fluvial Lacustrine Lhasa River
WOS标题词Science & Technology ; Physical Sciences
关键词[WOS]ERLANGEN AMS FACILITY ; ASIAN MONSOON ; LOESS SEDIMENTATION ; LAKE-SEDIMENTS ; TSANGPO RIVER ; HOLOCENE ; PLATEAU ; LUMINESCENCE ; MOUNTAINS ; EVOLUTION
收录类别SCI
语种英语
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000269057400002
引用统计
被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.isl.ac.cn/handle/363002/5885
专题青海盐湖研究所知识仓储
盐湖地质与环境实验室
作者单位1.Univ Marburg, Fac Geog, D-35032 Marburg, Germany
2.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
3.Univ Leipzig, Dept Geog, D-04103 Leipzig, Germany
4.Lab Quaternary Woods, CH-8135 Langnau, Switzerland
5.China Earthquake Adm, Lab Earthquake Observat Space, Beijing 100036, Peoples R China
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GB/T 7714
Kaiser, Knut,Lai, Zhongping,Schneider, Birgit,et al. Sediment sequences and paleosols in the Kyichu Valley, southern Tibet (China), indicating Late Quaternary environmental changes[J]. ISLAND ARC,2009,18(3):404-427.
APA Kaiser, Knut.,Lai, Zhongping.,Schneider, Birgit.,Schoch, Werner H..,Shen, Xuhui.,...&Brueckner, Helmut.(2009).Sediment sequences and paleosols in the Kyichu Valley, southern Tibet (China), indicating Late Quaternary environmental changes.ISLAND ARC,18(3),404-427.
MLA Kaiser, Knut,et al."Sediment sequences and paleosols in the Kyichu Valley, southern Tibet (China), indicating Late Quaternary environmental changes".ISLAND ARC 18.3(2009):404-427.
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