黄河河口段与海河河口段沉积物碳酸盐对比分析

发布时间：2018-01-20 23:55

本文关键词： 碳酸盐粒度分布沉积物黄河系海河系　出处：《海洋科学》2017年07期 　论文类型：期刊论文

【摘要】：利用筛析-沉降法对黄河系及海河系沉积物进行了粒度特征分析,黄河系沉积物以极细砂-粗粉砂为主,分选性中等,粒度分布正偏,峰态曲线尖窄;海河系沉积物以细粉砂为主,分选性较差,粒度分布正偏,峰态曲线较平缓。测定黄河系及海河系沉积物碳酸盐的粒度百分含量及碳酸盐加权粒度百分含量,结果表明:黄河系沉积物碳酸盐粒度百分含量加权平均值为11.36%,细砂碳酸盐粒度百分含量较高(15.24%),随粒度越细波动式降低后逐步增加,并在黏土富集,达20.67%;海河系沉积物中碳酸盐粒度百分含量加权平均值为15.05%,比黄河系略高,呈两端高中间低不对称鞍形粒度分布。黄河系与海河系碳酸盐粒度百分含量受粒度控制,对全样碳酸盐贡献最大的粒度黄河系为粗粉砂,海河系为细粉砂。黄河系全岩碳酸盐平均粒度百分含量与马兰黄土相近,与黄渤海泥质区相当,表明黄河沉积物的主要来源是马兰黄土,黄河在沉积物搬运过程中对黄土碳酸盐没有明显改造,黄河沉积物黏土组分是黄渤海泥质区沉积物高碳酸盐的主要影响因素。
[Abstract]:The grain size characteristics of the Yellow River and Haihe sediments were analyzed by sifting and settling method. The sediment of the Yellow River series was mainly composed of very fine sand and coarse silt with moderate sorting property, positive distribution of granularity and narrow peak curve. The sediment of Haihe system is mainly fine silt with poor sorting, positive distribution of granularity and gentle peak state curve. The granularity percentage content and weighted granularity percentage content of carbonate in the sediments of Yellow River series and Haihe system are measured. The results show that the weighted average value of carbonate granularity percentage in Yellow River sediments is 11.36, and that in fine sand is 15.24%. With the decrease of particle size, it increases gradually, and is enriched in clay, reaching 20.67. The weighted average of carbonate granularity percentage content in the sediments of Haihe series is 15.05, which is slightly higher than that of the Yellow River series. The granularity content of carbonates in the Yellow River system and the Haihe system is controlled by the granularity, and the coarse silt is the Yellow River system that contributes the most to the whole carbonate. Haihe system is fine silty sand. The average granularity percentage content of carbonates in the Huanghe series is similar to that of Ma Lan loess and is similar to that in the muddy area of the Yellow Sea and Bohai Sea, indicating that the main source of the Yellow River sediments is Ma Lan loess. In the process of sediment transport, the Yellow River has no obvious transformation of loess carbonate, and the clay composition of the Yellow River sediment is the main factor affecting the high carbonate content in the sediment in the muddy area of the Yellow Sea and Bohai Sea.
【作者单位】：鲁东大学资源与环境工程学院;
【基金】：国家自然科学基金(41576057)~~
【分类号】：P736.21;TV148
【正文快照】： 黄河作为世界含沙量最多的河流,其中90%以上的泥沙来源于黄土地区,沉积物来源集中,这些物质大部分堆积在河口三角洲地区,受黄土组分的影响,黄河沉积物中的碳酸盐包括原生碳酸盐、次生碳酸盐和自生碳酸盐,碳酸盐含量较高[1-2],以方解石为主,白云石次之。海河系中多数支流发源和

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