黄海辐射沙洲沉积物地球化学特征及其环境意义

Geoche mical characteristics of radial submarine sand ridges,Yellow Sea,China

对黄海辐射沙洲烂沙洋水道区域的3个钻孔共81个沉积物样品进行了微量、常量元素分析和14C测年分析,化学元素质量分数的变化与当时沉积环境的变化相对应。突发事件(如风暴潮)的发生不但在沉积物的岩性上有所体现,而且在微量元素质量分数的变化上也有很明显的体现。微量元素Zr可作为沉积能量变化的地化指示剂,潮汐通道北部的西太阳沙区域的沉积动力环境在4000a以前是较弱的。潮流通道的上段沉积物是来自水深较浅的区域,由于潮流和波浪的作用使其能够保持稳定的水深。

Major and minor chemical elementals were measured in the samples from3cores in radial sub marine sand ridges of YellowSea.The age of the samples were measured by 14 C.Variations in elements reflect the change of sediment environ_ ment.Enrichment of Zr indicates a higher depositional energyenviron ment.4000years ago,depositional energy in Xitaiyangsha was s maller.