| Effects of grain size distribution on mineralogical and chemical compositions: a case study from size-fractional sediments of the Huanghe (Yellow River) and Changjiang (Yangtze River) | |
| Zhou, Xiaojing1; Li, Anchun1; Jiang, Fuqing1; Lu, Jian1,2 | |
| 2015-07-01 | |
| 发表期刊 | GEOLOGICAL JOURNAL
 |
| 卷号 | 50期号:4页码:414-433 |
| 文章类型 | Article |
| 摘要 | The influence of hydrodynamics on the chemical composition of sediments is based on the uneven distribution of element abundances in different size fractions. In this study, 72 size-fractional sediments from the Huanghe (Yellow River) and Changjiang (Yangtze River) riverbeds were measured with XRD, SEM, ICP-AES and ICP-MS. The analysis results show that the mineral and chemical characteristics change with grain size in the Huanghe and Changjiang sediments. According to the principal components analysis, three independent geochemical factors were found. The first factor elements, Zr, Hf, Th, U, Y, La and TiO2 are influenced by the existence of heavy minerals. The second factor elements, Al2O3, alkalis, alkaline earth (excluding Ca and Sr) and most of the transitional metals are dominated by clay minerals. The third factor group includes Ca and Sr, which were controlled by calcium-bearing mineral contents and chemical weathering intensities. The various grain size distributions greatly affect the mineralogical and chemical compositions of bulk sediments. Compared to other size fractions, the 5-6PHI size fractions of the Huanghe and Changjiang sediments have special mineralogical and chemical compositions, and intermediate volume percentages. Weight or volume percentage of each size fraction may be more suitable than mean grain-size of the bulk sediment to elucidate the grain size effects. Chemical Index of Alteration (CIA) values increase steeply with decreasing grain size, while Weathering Index of Parker (WIP) values are relatively stable. Because of the big influence of the abundance of clay minerals on CIA values, it is questionable to use CIA as a proxy of weathering intensity. Considering the clay mineral effects, stability in values and heterogeneous material properties, WIP has the potential to indicate the chemical weathering intensity of sediments. Copyright (c) 2014 John Wiley & Sons, Ltd. |
| 关键词 | Chemical Composition Mineralogy Size-fractional Sediments Huanghe Changjiang Weathering Indices |
| DOI | 10.1002/gj.2546 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000357831700002 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/49205 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Zhou, Xiaojing,Li, Anchun,Jiang, Fuqing,et al. Effects of grain size distribution on mineralogical and chemical compositions: a case study from size-fractional sediments of the Huanghe (Yellow River) and Changjiang (Yangtze River)[J]. GEOLOGICAL JOURNAL,2015,50(4):414-433. |
| APA | Zhou, Xiaojing,Li, Anchun,Jiang, Fuqing,&Lu, Jian.(2015).Effects of grain size distribution on mineralogical and chemical compositions: a case study from size-fractional sediments of the Huanghe (Yellow River) and Changjiang (Yangtze River).GEOLOGICAL JOURNAL,50(4),414-433. |
| MLA | Zhou, Xiaojing,et al."Effects of grain size distribution on mineralogical and chemical compositions: a case study from size-fractional sediments of the Huanghe (Yellow River) and Changjiang (Yangtze River)".GEOLOGICAL JOURNAL 50.4(2015):414-433. |
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| Effects of grain siz（1404KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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