长江和黄河河口沉积物中石英氧同位素的对比

乔淑卿; 杨作升; 李云海; 陈晓辉

长江和黄河河口沉积物中石英氧同位素的对比

中国海洋大学河口海岸带研究所, 青岛 266003

基金项目:

国家自然科学基金重大研究计划(90211022)

详细信息

作者简介:
乔淑卿(1979-),女,博士生,从事矿物地球化学研究,E-mail:qq1125@mail.ouc.edu.cn

中图分类号: P736.4
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出版历程
- 收稿日期: 2005-10-18
- 修回日期: 2005-12-22

OXYGEN ISOTOPE OF QUARTZ IN SEDIMENTS FROM THE YANGTZE (CHANGJIANG) AND YELLOW(HUANGHE) RIVERS

Institute of Estuarine Coastal Studies, Ocean University of China, Qingdao 266003, China

摘要

摘要: 采用硫酸氢钾(KHSO₄)熔融-六氟硅酸(H₂SiF₆)浸泡的化学方法分离出长江、黄河河口不同粒级沉积物中的石英矿物,使用BrF₅为氧化剂提取出石英矿物中的氧,在质谱计上测定石英中氧同位素比值(δ¹⁸O值),结果表明:同一沉积物样品中随粒度由粗变细,石英δ¹⁸O值逐渐增加,长江河口沉积物中石英的δ¹⁸O值比黄河河口沉积物中的稍高,两条河流河口沉积物中相同粒级石英δ¹⁸O值差别主要受流域沉积物物质来源和流域的气候环境差异的影响。
- 石英 /
- 沉积物 /
- 氧同位素比值 /
- 长江 /
- 黄河
Abstract: Quartz in sediments from the Yangtze and Yellow Rivers was separated by potassium hydrogen sulfate (KHSO₄) fusing-hydrofluorosilic acid (H₂SiF₆). Oxygen was extracted from the quartz fraction by BrF₅ (used as oxidant), and then its isotopic composition was analyzed by mass-spectrometer, expressed as δ¹⁸O (¹⁸O/¹⁶O)values (relative to SMOW). The results show that δ¹⁸O values generally increase with grain size of quartz changing from coarse to fine. The oxygen isotope ratios (δ¹⁸O) of quartz from the Yangtze River are higher than those from the Yellow River. The differences in δ¹⁸O values of the same grain-size quartz between the Yangtze and Yellow Rivers may have resulted from different sediment sources and climate conditions along these two river basins.
- quartz /
- sediment /
- oxygen isotope ratio /
- the Yangtze River /
- the Yellow River

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参考文献(19)

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