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摘要: 用等离子体质谱法(ICP—MS)对苏北岸外南黄海陆架区NT2孔72个沉积物样品的稀土元素(REE)进行了分析，研究了中更新世中、晚期以来苏北岸外南黄海陆架区沉积物物源的变化。相关分析揭示NT2孔粒度和化学风化对REE组成影响较小。判别函数和稀土元素配分模式表明南黄海NT2孔沉积物物源主要为长江源和黄河源。 REE判别图解揭示NT2孔上部0~5.50 m和5.50~19.
30 m沉积物以长江源为主，中部19.30~27.00 m沉积物以黄河源为主，27.00~54.60 m沉积物以长江源为主，下部54.60~70.31 m沉积物以黄河源为主。研究表明黄河在中更新世中晚期已开始对南黄海陆架沉积作用有明显影响，而长江从晚更新世早期到现代对南黄海陆架起着主要作用。Abstract: The rare earth elements (REE) of 72 sediment samples taken from Core NT2 in the South Yellow Sea near Jiangsu coast were measured with ICPMS in order to study the variation of sediment source since the middlelate period of middle Pleistocene. The correlation plot indicates that the REE composition was less influenced by sediment grain size and chemical weathering, therefore, was primarily controlled by provenance rocks. The discrimination plot of REE parameter suggests that provenance of sediment in this core is mainly the Yangtze River and Yellow River. Of the core, the sediments between 0~5.50 m, 5.50~19.30 m in upper Core NT2 mainly belong to Yangtze River source; the sediments between 19.30~27.00 m in middle Core NT2 are mainly from Yellow River, and the sediments between 27.00~54.60 m are mainly from Yangtze River; the sediments between 54.60~70.31 m in lower Core NT2 are mainly from Yellow River. The results demonstrate that the Yellow River has an obvious effect on sedimentation of the South Yellow Sea shelf from during the middlelate period of middle Pleistocene and the Yangtze River has been playing a main role to the South Yellow Sea since early period of Late Pleistocene.-
Key words:
- rare earth elements /
- provenance /
- Core NT2 /
- South Yellow Sea
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