Cite this paper:
Zhang Ying, Zhang Hui, Wang Xiaojing, Liu Jihua, Wang Hongmin, Zhu Aimei, Hu Ningjing. Sequential extraction of Sr and Nd isotope from Fe–Mn oxyhydroxide and detrital in marine sediments[J]. Haiyang Xuebao, 2020, 42(2): 155-166

Sequential extraction of Sr and Nd isotope from Fe–Mn oxyhydroxide and detrital in marine sediments

Zhang Ying1,2,3, Zhang Hui1,2,3, Wang Xiaojing1,2,3, Liu Jihua1,2,3, Wang Hongmin1,2,3, Zhu Aimei1,2,3, Hu Ningjing1,2,3
1. First Institute of Oceanography, Minisitry Natural Resources, Qingdao 266061, China;
2. Key Laboratory of Marine Sedimentology and Environmental Geology, Minisitry Natural Resources, Qingdao 266061, China;
3. Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
Abstract:
The radiogenic isotope composition of neodymium (Nd) and strontium (Sr) extracted from Fe-Mn oxyhydroxide and detrital in marine sediments indicated potential for investigate present and past oceanic circulation or input of terrigenous material. However, the isotope compositions of elements obtained from the Fe-Mn oxyhydroxide fraction and detrital are easily disturbed by each other originating from the extraction process, will affect the isotope composition of these fractions. Therefore, it is very important to establish a rigorous leaching procedure that can be used to separate both Fe-Mn oxyhydroxide and the detrital fraction from the same marine sediment sample for Nd and Sr isotopic analysis. In this study, the mixture reagent of hydroxylamine hydrochloride (HH) and acetic acid (HAc) at 12 different concentrations were used to extract Fe-Mn oxyhydroxide fraction and detrital from zeolite clay of the Central Indian Ocean Basin, bathyal sediment of Arctic and offshore marine sediment of the Andaman Sea. Detrital was dissolved by HF-HNO3 system with high-pressure closed digestion method. Elements concentration and Sr and Nd isotope ratios in these fractions were measured. To corroborate the reliability of the extracting methods, REE patterns, Al/Ca ratios, as well as Sr and Nd isotope compositions were applied to assess the absence of detrital contributions to the extracted solutions and to support the seawater origin of the Nd isotope ratios in the Fe-Mn oxyhydroxide fraction. The result showed that different genetic types of sediments have different extraction reagents. The ideal reagent concentration for extraction of Fe-Mn oxyhydroxide fraction from zeolite clay is 0.25 mol/L HH in 15% acetic acid, for bathyal sediment of Greenland Sea and offshore marine sediment is 0.5 mol/L HH in 15% acetic acid. This method can accurately obtain the Sr and Nd isotopic composition of Fe-Mn oxyhydroxide and residue state in marine sediments, providing method support for the study of paleoceanography.
Key words:    marine sediment    extraction    Fe-Mn oxyhydroxide    detritus    87Sr/86Sr    143Nd/144Nd   
Received: 2019-01-29   Revised: 2019-04-09
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Articles by Zhang Ying
Articles by Zhang Hui
Articles by Wang Xiaojing
Articles by Liu Jihua
Articles by Wang Hongmin
Articles by Zhu Aimei
Articles by Hu Ningjing
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