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| Titel |
Sedimentary and OSL chronological evidence for formation of the present Hobq Desert landform in northern China |
| VerfasserIn |
Yuxin Fan, Xiaolong Chen, Tianlai Fan, Ming Jin, Jianbao Liu, Fahu Chen |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250079857
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| Zusammenfassung |
| Hobq desert is one of the important deserts in the central China. Researches of formation and
evolvement of such a desert will be helpful to understanding paleoenvironmental and
paleoclimatic changes in this region. In this paper, stratigraphic sequence of the
Hobq Desert was observed through thirteen profiles and pits along five sections
south-north extended through the entire desert. Aeolian sands are found to covering
alluvial-, diluvial- and lacustrine- sediments in this desert. OSL dating results are
obtained from sands at the bottom of sand dunes/sand hills by using the post-IR
OSL protocol to quartz fractions. The Hobq Desert started to form since the Last
Glacial maximum is revealed by OSL ages that sands started to accumulated at
around 19 ka in the north-western part and at around 9 ka in the eastern part of
the desert. OSL ages throughout the entire Hobq Desert support that sand dune
activity was strengthened at 6-5 ka and sand covering area especially expended
to south and north to form the present desert landform since 3-2 ka. Beginning
of formation of the present Hobq Desert landform was considered triggered by
retreat of Asian monsoon instead of human activity because human activity is one
thousand years later than the last expansion of the Hobq desert at around 3 ka. |
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