Mineralogy and geochemistry of modern Yellow River sediments: Implications for weathering and provenance
Mineralogy and geochemistry of modern Yellow River sediments: Implications for weathering and provenance
复制标题
现代黄河沉积物的矿物学和地球化学：对风化和来源的影响
DOI：
10.1016/j.chemgeo.2018.04.010
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发表时间：
2018-06
期刊：
影响因子：
3.9
通讯作者：
Pang HL
中科院分区：
文献类型：
--
作者：
Pang Hongli;Pan Baotian;Gao Hongshan;Zhao Xin;Chen Dianbao;Garzanti Eduardo;Pang HL
本研究阐明了黄河上游沉积物的结构特征、矿物学特征和地球化学特征。研究了主要支流沉积物的物源、风化强度和水力分选对沉积物空间成分变异的影响。与洪泛平原沉积物相似，河床沉积物相对于上陆壳标准，MgO和Na2O富集，CaO和Si2O富集。稀土元素（REE）表现为LREE富集和负Eu异常（Eu/Eu* = 0.54-0.68）。低的化学蚀变指数表明干流河道、漫滩和主要支流的沉积物在干旱-半干旱气候条件下没有经历强烈的化学风化作用。化学元素的分布表现为Zr和Hf随粒度的增大而显著增加，而Rb、Ni和V则与邻近沙丘场和支流提供的更细的沉积物组分有关。Al/Si比值（晶粒尺寸的代表）与CIA、Fe2O3、MgO和K2O呈正相关，而与Na2O无关，反映了晶粒尺寸的控制。黄河上游及黄河高原支流（如清水河和祖里河）黏土矿物组合以伊利石和绿泥石为主，而黄河中游及鄂尔多斯高原十大支流黏土矿物组合则以蒙脱石富集为主。
This study illustrates the textural, mineralogical and geochemical signatures of sediments from the upper Yellow River. Sediments of major tributaries have also been examined to study the influence of provenance, weathering intensity, and hydraulic sorting on the spatial compositional variability of sediments. Similarly to floodplain sediments, riverbed deposits are strongly depleted in MgO and Na2O, and enriched in CaO and Si2O relative to the upper-continental-crust standard. The pattern of rare earth elements (REE) indicates LREE enrichment and negative Eu anomaly (Eu/Eu* = 0.54–0.68). Low CIA (Chemical Index of Alteration) values indicate that the sediments from the trunk-river channel, floodplain, and major tributaries have not experienced intense chemical weathering in arid to semi-arid climatic conditions. The distribution of chemical elements shows a significant increase of Zr and Hf with coarsening of grain-size, whereas Rb, Ni, and V are associated with finer sediment fractions supplied by adjacent dune fields and tributaries. The Al/Si ratio (a proxy for grain size) correlates positively with CIA, Fe2O3, MgO, and K2O, but not with Na2O, reflecting grain-size control. Clay mineral assemblages in the upper Yellow River and in tributaries draining the Loess Plateau (e.g., Qingshui and Zuli Rivers) are dominated by illite and chlorite, whereas the abundance of smectite characterizes the middle reaches of the Yellow River and the Ten tributaries draining the Ordos Plateau.
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影响因子：
16.6
作者：
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影响因子：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
H. Nesbitt;G. M. Young