کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4731115 1640397 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impacts of grain size sorting and chemical weathering on the geochemistry of Jingyuan loess in the northwestern Chinese Loess Plateau
ترجمه فارسی عنوان
تاثیر اندازه دانه بندی دانه و هوای شیمیایی بر ژئوشیمی جینگویوان لس در شمال غربی چیلی لوس پلوتو
کلمات کلیدی
چی لیس، ژئوشیمی عنصری، مرتب سازی اندازه دانه، هوای شیمیایی، موزون شرق آسیا
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی

Major and trace elemental compositions of loess samples collected from the Jingyuan section in the northwestern Chinese Loess Plateau (CLP) were analyzed to investigate the potential impacts of grain size sorting and chemical weathering on the loess geochemistry and to extract appropriate geochemical indices for better evaluating the East Asian monsoon variability. Based on variations of major and trace elements in different grain size fractions, seventeen elements were classified into three types: (1) Si and Na display higher contents with the increased particle sizes; (2) Al, Fe, Mg, K, Mn, Zn, Rb, Cr, V are mainly enriched in fine size fractions; (3) Ti, Ba, Zr, P, Ca and Sr show irregular variations among different size fractions. Comparison of Al-normalized elemental ratios with Zr/Rb and Rb/Sr ratios (two commonly employed indicators for grain size sorting and pedogenic weathering) indicates that Si/Al, Zr/Al, Ti/Al variations match well with Zr/Rb and grain size results, whilst Ca/Al, Sr/Al, P/Al ratios display similar variability as that of Rb/Sr ratio. Comparison of loess based proxies (e.g., elemental ratios, magnetic susceptibility, grain size) of Jingyuan section with speleothem and ice-core records confirms that elemental ratios of high-resolution loess sequences developed in the northwestern CLP can be employed to address fluctuations of the winter monsoon-induced grain size sorting and summer monsoon-related weathering and pedogenesis at glacial–interglacial and millennial timescales.


► We report major and trace elemental compositions of Jingyuan loess sequence.
► Distribution of major and trace elements in different loess fractions is clarified.
► Si/Al, Zr/Al and Ti/Al ratios could reflect the impacts of grain size sorting.
► Ca/Al, Sr/Al and P/Al ratios are linked to the degree of chemical weathering.
► Loess geochemistry can document millennial East Asian Monsoon variability.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 69, 5 June 2013, Pages 177–184
نویسندگان
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