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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
Source PublicationISLAND ARC
Volume18Issue:3Pages:404-427
SubtypeArticle
AbstractP>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.
KeywordColluvial Eolian Fluvial Lacustrine Lhasa River
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordERLANGEN AMS FACILITY ; ASIAN MONSOON ; LOESS SEDIMENTATION ; LAKE-SEDIMENTS ; TSANGPO RIVER ; HOLOCENE ; PLATEAU ; LUMINESCENCE ; MOUNTAINS ; EVOLUTION
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000269057400002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/5885
Collection青海盐湖研究所知识仓储
盐湖地质与环境实验室
Affiliation1.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
Recommended Citation
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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