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- W2358595799 abstract "By the study on the terrace deposits, erosional surface and the neighbouring loesspaleosol sequences from different erosion profiles located in flatland and hillland as well as valley rigions of Loess Plateau, and linking to the analysis of proxy indices of paleoclimate, three results are concluded:(1) The well developed T 3 terraces of the gullies in flatland, hillland and valley rigions of eastern Loess Plateau, and their identical deposit features which include sandgravel, subclay and fluvial loess layers indicate that they are obviously the relevant sediments during the strong erosion period. Comparing stratigraphy with TL dating results, it can be determined that S1 paleosols formed in the interglacial period draped over the above gully terraces. This implied that the erosion event occurred at about 130 ka B.P. before the S 1 paleosols developed. (2) The analysis of climatic proxy indices such as magneticsusceptibility, δ 13 C and variability of magneticsusceptibility revealled a greater climatic gradient or greater precipitation variability at about 130 ka B.P., which showed, on one hand, the precipitation increased sharply, on the other hand, the precipitation contribution with time was rather uneven. These provided a favourable driving condition for large scale land surface erosion. The δ 13 C value increasing smoothly, and magneticsusceptibility rising sharply indicated that, even though precipitation suddenly increased, the vegetation was not recovered completely yet. These provided profitable land surface environmental condition for the large scale erosion. Due to the above two factors, the eastern Loess Plateau occurred a violent climatic erosion event at about 130 ka B.P. before the S 1 paleosols developed.(3) The deposits of T 3 terraces were sand mixed with gravel. The too bad sorting implied that this erosion event was probably drived by high intensity rain storms." @default.
- W2358595799 created "2016-06-24" @default.
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- W2358595799 date "1998-01-01" @default.
- W2358595799 modified "2023-09-25" @default.
- W2358595799 title "CLIMATIC EROSION EVENT OCCURRED IN THE EASTERN LOESS PLATEAU AT ABOUT 130 ka B.P." @default.
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