Sedimentary Characteristics of Paleo-eolian Dune Sands in Salawusu Formation of the Salawusu River Valley
Received date: 2006-01-06
Revised date: 2006-06-20
Online published: 2006-09-25
Supported by
National Basic Research Program of China, No.2004CB720200; National Natural Science Foundation of China, No.49971009; Knowledge Innovation Project of the Chinese Academy of Sciences, No.KZCX2-SW-118
The Salawusu Formation of Milanggouwan section in Salawusu River Valley includes 7 layers of paleo-mobile dune sands, and 4 layers of paleo-fixed and semi-fixed dune sands. We have observed the structure of these dune sands and analyzed the grain-size, surface textural features and several main chemical elements of them, the results showed that: (1) these dune sands have some eolian structure characteristics which are similar to the recent dune sands; (2) they are also similar to the recent dune sands in grain-size components, and parameters of Mz, σ, Sk and Kg, as well as in several main chemical components; (3) the scatter plots of Mz-σ, SiO2-Al2O3+TOFE and the probability curves of grain-size showed that these paleo dune sands are different from paleosols and fluvio-lacustrine facies but are consistency with recent dune sands; and (4) the quartz sands have well roundness and some surface textural features such as dish-shape pits, crescent-shape pits, pockmarked pits, upturned cleavage plates, siliceous precipitates and siliceous crevasses, indicating that they had been carried for a long time by the wind. As the 11 layers of paleo dune sands possess the eolian characteristics in structure, grain-size, surface textural features and chemical elements, the origin of their formation should be eolian.
OU Xianjiao,LI Baosheng,JIN Heling,WU Zheng,WEN Xiaohao,DONG Guangrong,ZENG Lanhua,OUYANG Chuntao,YANG Yi,LIU Yufei . Sedimentary Characteristics of Paleo-eolian Dune Sands in Salawusu Formation of the Salawusu River Valley[J]. Acta Geographica Sinica, 2006 , 61(9) : 965 -975 . DOI: 10.11821/xb200609008
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