Abstract
Mineral dust released from the desert is one of the important components of atmospheric aerosols. Arid and semi-arid deserts, sandy lands in northern China and their adjacent Gobi Desert lands in northern China and neighboring Mongolia (hereinafter referred to as Gobi) are potential sources of mineral dust in Asia. However, there is currently a lack of systematic studies on the characteristics of major elements in the potential mineral dust source area. This study investigates the major elements of 310 surficial sand samples in the stabilized and semi-stabilized dune fields from 12 deserts/sandy land and Gobi in northern China and southern Mongolian Gobi and compiles published data. We identify four regions with distinct geochemical characteristics: (1) Taklimakan, Kumtag and Qaidam deserts in western China; (2) Badain Jaran, Tengger, Hobq, and Mu Us deserts in the central and western regions of northern China; (3) Hulun Buir, Onqin Daga and Horqin sandy lands in northeast China; and (4) Gobi and Gurbantunggut deserts. The spatial distributions of the SiO2 and CaO contents in Chinese deserts are highly variable. The average content of SiO2 generally reflects an increasing trend from west to east, while the average content of CaO shows a decreasing trend from west to east. We demonstrate that the spatial variation of major elements is likely controlled by two key scenarios: the composition of source rocks and the mineral maturity caused by the supply of fresh materials. The SiO2/(Al2O3+K2O+Na2O) ratio of desert sediments is relatively lower in western China and may be caused by high ferric-magnesia and high carbonate minerals; this ratio is relatively higher in the northeast sandy lands and may be linked to a lack of fresh material supply and the presence of high K-feldspar minerals in source rocks. The deserts can be further distinguished by ternary diagrams with SiO2/10-CaO-Al2O3, (K2O+Na2O)-CaO-Fe2O3 and CaO-Na2O-K2O. The comparison of major elements between desert sediments and loess suggests that the western and/or central deserts in China may be the potential provenances of loess on the Loess Plateau.
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Acknowledgements
We acknowledge senior researcher Youbin Sun at the Institute of Earth Environment (IEE), the Chinese Academy of Sciences (CAS), for Mongolian Gobi samples; associate Prof. Xiaoyong Wang at the School of Geographic and Oceanographic Sciences, Nanjing University, and Prof. Wenbo Rao at the School of Earth Sciences and Engineering, Hohai University, for providing samples. We also thank Dr. Xianqiang Meng, Tong He, Jiawei Da, Shilei Li and others for their help with this work. We thank Wanyi Lu for improving the language of the manuscript and two reviewers for helpful comments. This work was supported by the National Natural Science Foundation of China (Grant Nos. 41673095, 41230526, 41690111 & 41877369) and the Fundamental Research Funds for the Central Universities (Grant No. Swu118203).
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Zhao, W., Liu, L., Chen, J. et al. Geochemical characterization of major elements in desert sediments and implications for the Chinese loess source. Sci. China Earth Sci. 62, 1428–1440 (2019). https://doi.org/10.1007/s11430-018-9354-y
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DOI: https://doi.org/10.1007/s11430-018-9354-y