High-Precision Measurements of Fe and Zn Isotopic Ratios in Marine Sediments

详细信息   

• 责任者：Qi Changshi (State Key Laboratory of Marine Environmental Science ; Xiamen University ; Xiamen 361005 ; China) ; Zhu Xiangkun
• 刊名：Geochimica
• 出版年：2012
• 卷期：41(3)
• 关键词：海洋沉积物 ; marine sediments ; 铁同位素 ; iron isotopes ; 锌同位素 ; zinc isotopes
• 页码：p.197-206
• 图表：5 illus., 2 tables, 55 refs.
• 分类号：0900
• issnNo：ISSN0379-1726
• isbnNo：CN44-1398/P

摘要

///The authors present an optimized chemical separation and purification procedure as well as an analytical method for measuring Fe and Zn isotopic composition in marine sediments. The authors also report Fe and Zn isotopic compositions in two sediment cores with an age of 1-2 ka from the summer upwelling region in the western South China Sea. The results demonstrate that this chemical preparation can rapidly dissolve marine sediments, remove organic matter, and, in combination with this analytical technique, the authors achieved high analytical precisions of 0.10‰ for δ⁵⁶Fe （2SD） and of 0.11‰ for δ⁶⁶Zn （2SD）. These two sediment cores had nearly invariant δ⁵⁶Fe and δ⁶⁶Zn values throughout the sediment cores. Moreover, δ⁵⁶Fe （0.04‰ - 0.20‰） and δ⁶⁶Zn （0.12‰ - 0.30‰） from these 1~2 ka marine sediments are overall close to those reported for loesses and aerosols, igneous rocks and other marine sediments worldwide, but much higher than those deposited in euxinic environments.