A 900 k.y. record of strath terrace formation during glacial-interglacial transitions in Northwest China

The timing of the development of strath terraces with respect to climatic variability remains equivocal. Previous studies attribute strath-terrace formation to glacial or interglacial climates or to variations in sediment and water fluxes that cause lateral erosion followed by vertical incision. A c...

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Bibliographic Details
Published in:Geology (Boulder) 2003-11, Vol.31 (11), p.957-960
Main Authors: Pan Baotian, Pan Baotian, Burbank, Douglas, Wang Yixiang, Wang Yixiang, Wu Guangjian, Wu Guangjian, Li Jijun, Li Jijun, Guan Qingyu, Guan Qingyu
Format: Article
Language:English
Subjects:
absolute age
alluvial fans
Asia
Cenozoic
China
chronology
clastic rocks
clastic sediments
climate change
conglomerate
dates
deglaciation
erosion
erosion features
erosion surfaces
Far East
fluvial features
Geochronology
Geology
geomorphology
glacial environment
Glaciers
incised valleys
interglacial environment
landform evolution
loess
neotectonics
northwestern China
paleoclimatology
paleomagnetism
paleosols
Qilian Mountains
Quaternary
Quaternary geology
rivers
sedimentary rocks
sediments
Shagou River
strath terraces
tectonics
terraces
thermoluminescence
Tibetan Plateau
upper Quaternary
water erosion
Xizang China
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Summary:The timing of the development of strath terraces with respect to climatic variability remains equivocal. Previous studies attribute strath-terrace formation to glacial or interglacial climates or to variations in sediment and water fluxes that cause lateral erosion followed by vertical incision. A chronology of strath-terrace formation spanning ∼900 k.y. has been generated on the basis of loess-paleosol couplets and paleomagnetic, thermoluminescence, and radiocarbon dating of strath terraces in the Qilian Shan of northeastern Tibet. Repetitive stratigraphic and geomorphic patterns on each terrace indicate that they formed during glacial-interglacial transitions. Long-term bedrock incision rates and inferred rock uplift rates appear steady and unrelated to strath formation over the past 900 k.y.
ISSN:0091-7613
1943-2682
DOI:10.1130/G19685.1