海洋地质与第四纪地质2025，Vol.45Issue(2)：203-214,12.DOI:10.16562/j.cnki.0256-1492.2024020201
不同化学淋滤方法对沉积物碎屑组分中REE和Sr-Nd同位素测试的影响
The impact of different chemical leaching methods on REE and Sr-Nd isotopes analysis of sediment detrital components
摘要
Abstract
Sediments are complex mixtures,and different geological studies often require the extraction of different chemical components from sediments.Sequential leaching is a commonly used method to differentiate different components of sediments.However,the effectiveness of sequential leaching experiments conducted so far is often explored only for a single type of sediment sample.It is unclear whether the leaching effect is also widely applicable to other types of sediment samples.In this study,three types of sediment samples from the Yangtze River,the Loess Plateau,and the South China Sea were selected.Three methods,including two commonly used sequential leaching procedures and an improved procedure proposed in this study,were applied to leach the samples.The aim was to assess the impact of different leaching methods on the REE and Sr-Nd isotopes analysis of the sediment detrital components.Results show that 1.5 M hydrochloric acid tends to excessively remove carbonate components from the samples,leading to a loss of over 50%of some major elements(Mn,Fe,and Mg)and REE elements.It could also cause the dissolution of some silicate detrital components,including clay minerals.1 M sodium acetate buffer solution with moderate acidity was shown more favorable for accurately removing carbonate components from all sediments.The removal of non-detrital components resulted in an increase of Sr isotopes in all the sediments.The main component influencing the isotopic composition of Sr in detrital components was the carbonate fraction.For Nd isotopes,the removal of non-detrital components led to a decrease inɛNd of sediment detrital components by 1-2 units.However,the relationship between the loss of Nd and the changes in detrital componentɛNd is more complex,and the effects of excessive shaking and prolonged reaction time on theɛNd of different types of sediments still require further investigation.关键词
化学淋洗/非碎屑组分/REE/Sr-Nd同位素/方法比较Key words
chemical leaching/non-detrital components/REE/Sr-Nd isotopes/comparative methods分类
海洋科学引用本文复制引用
赖伟波,李超,马松阳,郭玉龙,岳伟,贺茂勇,万世明,杨守业..不同化学淋滤方法对沉积物碎屑组分中REE和Sr-Nd同位素测试的影响[J].海洋地质与第四纪地质,2025,45(2):203-214,12.基金项目
国家重点研发计划项目"亚洲大陆边缘晚新生代风化沉积模式及碳汇效应"(2022YFF0800504) （2022YFF0800504）
国家自然科学基金项目"根据河流沉积物(234U/238U)计算流域尺度的平均侵蚀速率"(42273057),"晚更新世以来巽他陆架暴露对沉积物输运模式和风化沉积记录的影响"(42076063) （234U/238U）
上海市自然科学基金项目"基于230Th标准化的南海西南部质量累积速率校正和古生产力重建"(21590712700) （21590712700）
