| Fe isotopic composition of the Quaternary Red Clay in subtropical Southeast China Redoxic Fe mobility and its paleoenvironmental implications | |
Hu, Xue-Feng; Zhao, Jing-Long; Zhang, Pei-Feng; Xue, Yong; An, Bo-Nian; Huang, Fang; Yu, Hui-Min; Zhang, Gan-Lin; Liu, Xiang-Jun
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| 2019-10-05 | |
| 发表期刊 | CHEMICAL GEOLOGY
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| ISSN | 0009-2541 |
| 卷号 | 524页码:356-367 |
| 摘要 | To probe Fe isotopic signatures of the Quaternary Red Clay (QRC) in subtropical southeastern China, two QRC profiles located in southern Anhui Province, Southeast China, were studied. The whole profiles were generally in a narrow range in delta Fe-56 of -0.040 +/- 0.061 parts per thousand-0.117 +/- 0.048 parts per thousand. The Yellow-brown Earth (YBE) and Uniform Red Clay (URC) of the upper profiles were similar in delta Fe-56 to the Xiashu Loess along the Yangtze River, Southeast China, and the loess, paleosols and Tertiary red clay in the Chinese Loess Plateaus, Northwest China, as well as the baseline of terrestrial igneous rocks. The slight variation of delta Fe-56 from the YBE to the URC suggests that the chemical weathering and rubification on the aerobic surface did not fractionate Fe isotopes significantly. The Reticulate Red Clay (RRC) underlying the YBE and URC fluctuated in delta Fe-56 to some extent. The white veins separated from the lower RRC were depleted of Fe oxides and heavier in Fe isotopes, and the red veins, on the contrary, were isotopically lighter in Fe. delta Fe-56 of the white veins, 0.345 +/- 0.053 parts per thousand on average, was significantly higher than the bulk samples, 0.033 +/- 0.044 parts per thousand on average, and the red veins, - 0.021 +/- 0.046 parts per thousand on average. This suggests that the reticulate textures of the RRC were formed by the reductive removal/reprecipitation of Fe due to the cyclical changes of redoxic conditions. Fe isotopic composition of the QRC was dominantly controlled by the redoxic mobility of Fe, rather than the degree of weathering. delta Fe-56 of the profiles was not correlated with the paleoclimatic events, and thus cannot be used as a paleoclimatic proxy. The fractionation of Fe isotopes in the lower RRC, however, indicated the occurrence of over-humid paleoclimate with alternations between drought and wetness in Southern China during the Pleistocene. |
| DOI | 10.1016/j.chemgeo.2019.07.010 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.isl.ac.cn/handle/363002/34037 |
| 专题 | 盐湖地质与环境实验室 中国科学院青海盐湖研究所 |
| 推荐引用方式 GB/T 7714 | Hu, Xue-Feng,Zhao, Jing-Long,Zhang, Pei-Feng,et al. Fe isotopic composition of the Quaternary Red Clay in subtropical Southeast China Redoxic Fe mobility and its paleoenvironmental implications[J]. CHEMICAL GEOLOGY,2019,524:356-367. |
| APA | Hu, Xue-Feng.,Zhao, Jing-Long.,Zhang, Pei-Feng.,Xue, Yong.,An, Bo-Nian.,...&Liu, Xiang-Jun.(2019).Fe isotopic composition of the Quaternary Red Clay in subtropical Southeast China Redoxic Fe mobility and its paleoenvironmental implications.CHEMICAL GEOLOGY,524,356-367. |
| MLA | Hu, Xue-Feng,et al."Fe isotopic composition of the Quaternary Red Clay in subtropical Southeast China Redoxic Fe mobility and its paleoenvironmental implications".CHEMICAL GEOLOGY 524(2019):356-367. |
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| Fe isotopic composit（5462KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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