Some Insights into the Genesis and Evolution of Dunefields Along the Lower Ganjiang River and Surrounding the Poyang Lake

摘要

Based on a body of relevant literature and field investigations, this paper presents some insights into the genesis and evolution of dunefields along the lower Ganjiang River and surrounding the Poyang Lake, Jiangxi Province, central China. After analyses and comparisons, it concluded that: 1) the dunefields in the Poyang Lake valley occurred at lest during late Quaternary, not Holocene, and there could be theoretically mid-Quaternary dunefields; 2) the essentials of genesis and evolution of dunefields exist during both Quaternary glaciations and dry seasons and periods in the Holocene, especially in specific sites such as Sharing of Xingzi County and Laoyemiao of Duchang County; 3) considering the distinct location and spatial characters of the Poyang Lake valley, as the existence of "Easten Asian Cold Trough" is possible and reasonable, glacial and aeolian processes as a coupled complex should be concurrent and synergic in a much larger spatial extent, the widespread dunefields of late Quaternary suggest more possibly the existence of corresponding glacial products in the region; 4) the future explorations in such vulnerable and distinct environments entail more original ideas and approaches as well as research and analysis techniques in order to obtain more valuable results.