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Pt/Pd比值在研究区分布呈显著的区域特征.南黄海沿岸流输送物质以Pt/Pd>1为特征,为古黄河三角洲来源;长江流域来源物质以Pt/Pd≤1为特征.长江物源组分的影响范围广,在125°E、33°N沉积物中还能发现受长江物质的明显影响.除了源岩中Pt、Pd分配因素外,黄河和长江流域不同类型和程度的风化作用对沉积物中Pt、Pd分异起着关键的控制作用.虽然沉积物中氯含量、粒度效应在一定程度上影响着Pt、Pd分布,但是没有造成显著的Pt、Pd分馏.Pt/Pd≤1区域中元素组成和长江沉积物的组成特征一致,呈现比较强的硅质风化作用;Pt/Pd>1区域沉积物中的元素组成和黄河沉积物一致,K/Na-Rb/Sr图解显示古黄河物质在再侵蚀、搬运和沉积过程中化学成分进一步分异.
The Pt / Pd ratio has a significant regional distribution in the study area. The transport materials on the southern coast of the Yellow Sea are characterized by Pt / Pd> 1 and are sourced from the Yellow River delta. The source materials in the Yangtze River Basin are characterized by Pt / Pd≤1. The source components have a wide range of influence and can be found to be significantly affected by the Yangtze River sediments at 125 ° E and 33 ° N. Except Pt and Pd distribution factors in the source rocks, different types and degrees of weathering in the Yellow River and the Yangtze River basin The effect of Cr and Pd on sediment is the key controlling role.While the chlorine content and particle size effect in sediment affect Pt and Pd distribution to a certain degree, no significant Pt and Pd fractionation are caused.Pt / Pd The elemental composition in ≤1 area is consistent with the compositional characteristics of the Yangtze River sediments, showing strong siliceous weathering. The elemental composition in sediments of Pt / Pd> 1 is consistent with the sediments in the Yellow River, and the K / Na-Rb / Sr diagram The ancient Yellow River shows the chemical composition of the material in the erosion, handling and deposition process further differentiation.