OXYGEN ISOTOPE OF QUARTZ IN SEDIMENTS FROM THE YANGTZE (CHANGJIANG) AND YELLOW(HUANGHE) RIVERS
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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。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.
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Key words:
- quartz /
- sediment /
- oxygen isotope ratio /
- the Yangtze River /
- the Yellow River
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