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• W2057389871 endingPage "94" @default.
• W2057389871 startingPage "71" @default.
• W2057389871 abstract "Loess and paleosol samples from three distant sections (Xining, Xifeng, Jixian) of the Chinese Loess Plateau were analyzed for chemical and Nd–Sr isotopic compositions in order to obtain information about the paleoclimatic variation during the last 140 ka. These three sections represent three different climatic conditions, from arid in the west (Xining) to more humid in the east (Jixian) across the Loess Plateau. Isotopic analyses show that all the three sections display a restricted range of 143Nd/144Nd ratios (or εNd≈−10±0.5), indicating the dominance of relatively young and uniform upper crustal sources for the eolian dust. The loess and paleosol samples have typical upper crustal 87Sr/86Sr ratios (0.714–0.718), and their variation can partly be attributed to different carbonate/silicate ratios in the samples. REE data from the three sections are indistinguishable from each other; they show typical upper crust patterns characterized by (La/Yb)N≈10 and Eu/Eu*≈0.65. The high degree of chemical and isotopic homogeneity suggests that the dust source region must have undergone multiple recycling and thorough sedimentary mixing processes. Various chemical indicators have been used to monitor the pedogenetic intensity in these sections. Although results for the Jixian section agree reasonably well with the known climatic conditions on the Loess Plateau, the other two sections yield results not in agreement with some well-accepted proxies like magnetic susceptibility or grain-size distribution. Some chemical proxy indicators established in our previous work on the Luochuan section, such as the systematic U-depletion and negative Ce anomalies in REE patterns in soils, are not clearly recorded in the present case. The discrepancy between different climatic proxies could be related to the effective soil water budget, temperature, as well as the rate of development of each proxy." @default.
• W2057389871 created "2016-06-24" @default.
• W2057389871 creator A5000393948 @default.
• W2057389871 creator A5031123356 @default.
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• W2057389871 date "2001-08-01" @default.
• W2057389871 modified "2023-10-18" @default.
• W2057389871 title "Geochemistry of the Xining, Xifeng and Jixian sections, Loess Plateau of China: eolian dust provenance and paleosol evolution during the last 140 ka" @default.
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• W2057389871 doi "https://doi.org/10.1016/s0009-2541(00)00430-7" @default.
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