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| Titel |
The Landscape Evolution of Ulan Buh Desert in North China during Late Quaternary |
| VerfasserIn |
Fahu Chen, Guoqiang Li, Hui Zhao, Ming Jin, Yuxin Fan, David Madsen, Xi Chun |
| 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 |
250079431
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| Zusammenfassung |
| Desert evolution was one of the major environmental changes in northern China during
Quaternary. Ulan Buh Desert (UBD), at margin of present summer monsoon, is one of main
desert fields and dust source areas in the north and northwest China. In this paper we present
the results of lithology, Optical Stimulated Luminescence (OSL) dates, grain-size,
carbonate content, organic content and pollen analysis from the drilling cores in
the different parts of UBD. Our results show that most area of the present Ulan
Buh desert was covered by the Jilantai-Hetao mage-paleolake before ~90 ka ago,
a uniform paleolake of about 34,000 km2Â covering the whole Hetai palin, and
sevrious eolian and desert environment was prevailing during the last glacial and early
Holoccene. Then an Ulan Buh  paleolake (UB paleolake), likely a desert-wetland
enviroment, formed in the northern part of UBD and Jilantai salt lake at around 8-7
ka, leaving dry lake bed landform in northern UBD, while high dune landscape
probably prevailed in south UBD. After that, the mordern UBD landscape formed. The
Jilantai Salt Lake in  western UBD continued to exist until present with high lake
level during UB paleolake preiod. During the recent 2000 years aeolian sand from
Badan Jaran desert invaded the north UBD through Langshan mountain to form dune
landform covered on dry UB paleolake bed and seperated main Ulan Buh desert and
Jilantai Salt Lake. Human activities such as changing low wetland to farmland and
following abandonment resulted the formation of easten Ulan Buh desert in Han
dynasty since 200 BC. The formation of UBD landfporms was suggedted to be
relate to disintegration of Jilantai-Hetao mage-paleolake, and was also likely to
corresponding to summer monsoon changes during during last glacial and Holocene. |
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