Abstract
Based on the analysis of temporary-spatial distribution, geomorphic position, contact relationship with underlying strata and grain size of red clay, we studied the formation and environmental background of red clay. During late Miocene-Pliocene, the Ordos Block finished the transformation from the basin to the plateau, which had an obvious environmental effect on the topography, indicated by the formation of highland undergoing wind erosion and lowland receiving red clay deposits. The red clay materials were sourced from dusts carried by wind energy and covered on the initial topography. Unlike Quaternary loess dust covering the overall the Loess Plateau, red clay deposited on the highland would be transported to the lowlands by wind and fluvial process. As a result, there was no continuous “Red Clay Plateau” in the Ordos region and red clay was only preserved in former lowlands. However, red clay was discontinuously distributed through the Loess Plateau and to some extent modified the initial topography. The differential uplift in interior plateau is indicated by the uplift of northern Baiyushan, central Ziwuling and southern Weibeibeishan. The Weibeibeishan Depression formed earlier and became the sedimentary center of red clay resulting in the thicker red clay deposits in Chaona, Lingtai and Xunyi. Since Quaternary the aridity in the northern plateau enhanced and accelerated loess accumulation caused the formation of the Loess Plateau. During the late Pleistocene the rapid uplift led to the enhancement of erosion. Especially after the cut-through of Sanme Lake by the Yellow River, the decline of base level caused the falling of ground water level and at the same time the increase of drainage density resulting in the enhancement of evaporation capacity, which enhanced the aridity tendency of aridity in the Loess Plateau region.
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Supported by the National Basic Research Program of China (Grant No. 2003CB214607), Program for “Changjiang” Scholars and Innovative Team in University (Grant No. IRT0559), National Natural Science Foundation of China (Grant No. 40372202), Open Foundation of State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS (Grant No. SKLLQG0511) and Open Foundation of State Key Laboratory of Continental Dynamics, Northwest University
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Yue, L., Li, J., Zheng, G. et al. Evolution of the Ordos Plateau and environmental effects. Sci. China Ser. D-Earth Sci. 50 (Suppl 2), 19–26 (2007). https://doi.org/10.1007/s11430-007-6013-2
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DOI: https://doi.org/10.1007/s11430-007-6013-2