Geochemical indicator of original eolian grain size and implications on winter monsoon evolution
Geochemical indicator of original eolian grain size and implications on winter monsoon evolution
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DOI：
10.1007/bf02911995
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发表时间：
2001-12-01
期刊：
影响因子：
--
通讯作者：
Guo, ZT
中科院分区：
文献类型：
--
作者：
Peng, SZ;Guo, ZT
黄土高原风成沉积物的粒度特征已被广泛用于重建东亚冬季风的历史。然而，散装样品的粒度只是部分指示冬季风的强度，因为沉积后的风化过程显着改变了原来的风成颗粒的粒度。本文将非风化黄土样品分成8个不同的颗粒组分，并测定了主要化学元素，以建立原始风成粒度的地球化学指标。结果表明，不同组分中SiO2、Al 2 O3含量及SiO2/Al 2 O3比值随粒度呈规律性变化，且SiO2/Al 2 O3比值与粒度之间存在良好的线性关系
Grain size of eolian deposits from the Loess Plateau in China has been widely used to reconstruct the history of the East Asian winter monsoon. However, the grain size of bulk samples is only partially indicative to the strength of the winter monsoon because post-depositional weathering processes have significantly changed the grain size of original eolian particles. Here, non-weathered loess samples were separated into eight different particle fractions, and major chemical elements were determined in order to establish a geochemical indicator of original eolian grain size. The results show that SiO2 and Al2O3 contents and the SiO2/Al2O3 ratio in different fractions vary regularly with grain size, and that a good linear relation exists between the SiO2/Al2O3 ratio and grain size for the fractions