XVI INQUA Congress
Paper No. 58-2
Presentation Time: 1:30 PM-4:30 PM

STRATIGRAPHIC EVIDENCE OF EPISODIC GULLYING ON THE CHINESE LOESS PLATEAU

PORTER, Stephen C., Dept of Earth and Space Sciences and Quaternary Research Center, Univ of Washington, Seattle, WA 98195-1310, scporter@u.washington.edu and AN, Zhisheng, Insitute of Earth Environ, #10 Fenghi South Road, Xi'an High-Tech Zone, Xi'an, 710075, China, anzs@loess.llqg.ac.cn

Buried gullies are exposed along the margin of a loess tableland in road excavations near Tongchuan on the Loess Plateau of central China. They lie with in a thick loess/paleosol succession that spans at least the last 780,000 years. Constraining ages for gully cutting and filling are provided by the ages of loess and soil units cut by and capping the paleogullies. Gully cutting is initiated during the onset of interglacial conditions and ceases as the gullies begin to fill with colluvium and airborne dust during the transition from interglacial to glacial conditions. The episodic cutting and filling of gullies implies a basic astronomical (orbital) control of gully evolution involving cyclic changes in dominant summer and winter monsoon climates, surface hydrology, and vegetation cover.

XVI INQUA Congress
General Information for this Meeting
Session No. 58--Booth# 63
Late Quaternary Landscape Evolution and Palaeoclimates in Arid and Semiarid Regions of Central and East Asia (Posters)
Reno Hilton Resort and Conference Center: Pavilion
1:30 PM-4:30 PM, Monday, July 28, 2003

Geological Society of America Abstracts with Programs, , p. 176

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