Geochemical composition of Tajikistan loess and its provenance implications
Geochemical composition of Tajikistan loess and its provenance implications
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塔吉克斯坦黄土地球化学成分及其物源意义
DOI：
10.1016/j.palaeo.2016.01.025
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发表时间：
2016-03
影响因子：
3
通讯作者：
Aminov, Jamshed
中科院分区：
文献类型：
--
作者：
Chen, Xiuling;Li, Jinchan;Mamadjanov, Yunus;Aminov, Jamshed
塔吉克斯坦黄土对研究中亚第四纪气候变化和沙尘来源具有重要意义。本文研究了黄土的地球化学成分和物源。结果表明，主要元素平均含量由高到低依次为SiO2> Al2O3> CaO > Fe2O3> MgO > K2O > Na2O > TiO2> P2O5> MnO。黄土中Fe、Ti、P、Mn含量与古土壤中Si、Al、Mg含量相似。黄土中Ca明显富集，Si、Al、K亏损。Na在黄土和古土壤中均亏损，P仅在古土壤中亏损。与UCC相反，古土壤中除Ba、Sr和Zr外，其他微量元素均富集，但在黄土中，Ba、Co、Ni和Zr）显示贫化。TJ黄土的CIA值低于克什米尔黄土，克什米尔黄土的CIA值受分选和构造环境差异的影响。在TJ黄土形成过程中，物源变化不大，存款区距离物源较近。地球化学资料和大气环流资料表明，TJ黄土主要受近地表偏北风或西北风的搬运，但可能还有一个附加的局地源对南天山黄土沉积的形成有一定的贡献。
The Tajikistan (TJ) loess has great significance for the study of Quaternary climate changes and dust source in Central Asia. In this paper, we investigate the geochemical composition and provenance of loess. Our results show that the major elements, in order from high to low average content, are SiO2> Al2O3> CaO > Fe2O3> MgO > K2O > Na2O > TiO2> P2O5> MnO. Fe, Ti, P and Mn contents in loess are similar to those in the UCC, as is the case with Si, Al and Mg contents in paleosols. Ca is distinctly enriched in loess, and Si, Al and K are depleted. Na is depleted in both loess and paleosols, and P is depleted only in paleosols. In contrast to the UCC, paleosols show enrichments in all trace elements except for Ba, Sr and Zr, but in loess, some trace elements (e.g., Ba, Co, Ni and Zr) show depletion. The CIA value of TJ loess is lower than that of Kashmir loess, the latter being influenced by differences in the sorting and tectonic environment. There are no great changes about provenance during the formation of TJ loess, and the deposit areas have a shorter distance to the provenance. Geochemical data and atmospheric circulations demonstrate that the TJ loess was mainly transported by the near-surface northerly or northwesterly winds, but there may be an additional and local source making a certain contribution to the formation of loess deposits in the south of Tianshan.
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