| 海洋沉积物不同相态中Sr、Nd同位素提取方法研究 |
| |
| 引用本文： | 张颖,张辉,王小静,刘季花,汪虹敏,朱爱美,胡宁静.海洋沉积物不同相态中Sr、Nd同位素提取方法研究[J].海洋学报,2020,42(2):155-166. |
| |
| 作者姓名： | 张颖 张辉 王小静 刘季花 汪虹敏 朱爱美 胡宁静 |
| |
| 作者单位： | 1.自然资源部第一海洋研究所，山东 青岛 266061 |
| |
| 基金项目： | 国际海域资源调查与开发“十三五”规划项目（DY135-R2-1-01，DY135-R2-1-03）；国家自然科学基金项目（41676053）；国家自然科学基金青年科学基金项（41706068，41606075）。 |
| |
| 摘 要： | 海洋沉积物中Fe-Mn氧化物相和残渣态的Sr、Nd同位素组成能够敏感地指示洋流循环及物质来源,但实验室对沉积物中上述相态的Sr和Nd同位素的提取易产生过量或提取不完全,进而影响同位素测定结果的准确性,因此制定有效的提取流程显得非常重要。本文采用不同浓度盐酸羟胺(Hydroxylamine Hydrochloride,HH)与醋酸(Acetic Acid,HAc)混合溶液对中印度洋海盆深海沸石黏土、北极半深海沉积物以及安达曼海近海沉积物的Fe-Mn氧化物相进行提取,残渣态用HNO3-HF高压密闭消解法溶融,测定了各相态的主微量元素含量及Sr、Nd同位素组成,通过分析不同实验条件下得到的Fe-Mn氧化物相与残渣态的稀土元素(REE)配分模式、Al/Nd含量比值及Sr、Nd同位素组成,建立了3种不同成因类型海洋沉积物不同相态的化学提取方法。提取深海沸石黏土中Fe-Mn氧化物相的理想试剂条件为0.25 mol/L HH和15%HAc,北极半深海沉积物和安达曼海近海沉积物的试剂条件为0.5 mol/L HH和15%HAc。该方法可以准确获得沉积物中Fe-Mn氧化物相与残渣态的Sr、Nd同位素组成信息,为古海洋学的研究提供方法支持。
|
| 关 键 词： | 海洋沉积物 相态提取 铁锰氧化物 残渣态 87Sr/86Sr 143Nd/144Nd |
| 收稿时间： | 2019/1/29 0:00:00 |
| 修稿时间： | 2019/4/9 0:00:00 |
Sequential extraction of Sr and Nd isotope from Fe–Mn oxyhydroxide and detrital in marine sediments |
| |
| Zhang Ying,Zhang Hui,Wang Xiaojing,Liu Jihu,Wang Hongmin,Zhu Aimei and Hu Ningjing.Sequential extraction of Sr and Nd isotope from Fe–Mn oxyhydroxide and detrital in marine sediments[J].Acta Oceanologica Sinica (in Chinese),2020,42(2):155-166. |
| |
| Authors: | Zhang Ying Zhang Hui Wang Xiaojing Liu Jihu Wang Hongmin Zhu Aimei and Hu Ningjing |
| |
| Institution: | 1.First Institute of Oceanography, Minisitry Natural Resources, Qingdao 266061, China2.Key Laboratory of Marine Sedimentology and Environmental Geology, Minisitry Natural Resources, Qingdao 266061, China3.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. |
| |
| Keywords: | marine sediment extraction Fe-Mn oxyhydroxide detritus 87Sr/86Sr 143Nd/144Nd |
| 本文献已被 维普 万方数据 等数据库收录！ |
| 点击此处可从《海洋学报》浏览原始摘要信息 |
| 点击此处可从《海洋学报》下载免费的PDF全文 |
|
