南黄海NT1孔沉积物稀土元素组成与物源判别

Distributions of rare earth elements in sediments from Core NT1 of the South Yellow Sea and their provenance discrimination

为研究黄河、长江以及韩国河流输运的大陆物质对南黄海沉积的贡献,对南黄海中部泥质区NT1孔沉积物做了稀土元素分析和物源判别。研究发现,南黄海NT1孔沉积物物源主要为长江源和黄河源,NT1孔上部0～7.70m沉积物以长江源为主,中部7.70～16.60m和40.00～50.70m沉积物以黄河源为主,其间夹近24m厚的沉积物则以长江源为主,底部50.70～69.76m沉积物以长江源为主。结果表明,长江从晚更新世早期到现代对南黄海中部泥质区沉积起着主要作用,而黄河则在晚更新世晚期的早玉木冰期时已开始对南黄海陆架沉积作用有明显影响。

The contribution of substance from the Yellow River, the Yangtze River, and Korean rivers to the sedimentation of the Yellow Sea was studied through rare earth elements （REEs） analysis and through provenance discrimination of the sediments from Core NT1 among the argillized area in the central South Yellow Sea. The results show that the sediments in Core NT1 mainly come from the Yangtze River and the Yellow River. The sediments between 0 - 7.70 m in upper Core NT1 mainly belong to the Yangtze River source ; those between 7.70 16.60 m and 40. 00 - 50.70 m in middle Core NT1 are mainly from the Yellow River, the 24 m thick sediment interlayer in it mainly comes from the Yangtze River; and the sediments between 50.70 -69.76 m in the bottom of Core NT1 is mainly from the Yangtze River. It is concluded that the Yangtze River has been playing a main role in the argillized area in the central South Yellow Sea since influence the continental shelf sedimentation of the Yellow early Late Pleistocene, and the Yellow River started to Sea from early Warm Glaciation of late Late Pleistocene.