| 摘要: |
| 渤海湾泥质区M9-2与M9-4站柱状沉积物的粒度分析结 果表明,沉积物粒度组成在垂直分布上有较明显的变化规律,早全新世期间部分站位(如M9-2)沉积物较粗,另一部分站位(如M9-4)沉积物则较细,与现代黄河物质粒度近似;中全新世的沉积物粒度组成变化较大,但呈减小的趋势,向类似于黄河物质粒度特征发展,说明黄河物质对渤海湾影响作用的加强;到了晚全新世,黄河物质对渤海湾的影响则明显占据着主导地位,故沉积物粒度特征与现代黄河物质类似。上述的渤海湾沉积物粒度特征不仅反映出水动力条件的变化(与海 平面变化相联系),更说明了研究区物质来源的变化,尤其是明显反映出黄河物质对渤海湾阶段性的影响。 |
| 关键词: 全新世 渤海湾 沉积物 粒度特征 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目(40576032) |
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| Grain size characteristics of sediments in Bohai Bay during Holocene |
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| Abstract: |
| The core sediments in the mud area of Bohai Bay are measured with the laser analysis whose measuring range is between 0.3μm and 2000μm. The result shows that grain size compositions and grain size parameters of the core sediments have their obvious rules. The sediments are coarse in some parts like core M9-2 during early Holocene, while those of core M9-4 close to the characteristics of modern Yellow River material. The content of grain size compositions has big changes during the middle Holocene, but its trend is closing to minish, that is, they’re more and more similar to the characters of the materials of the Yellow River. The impact of the Yellow River materials on Bohai Bay is a leading factor whose result indicates that the characteristics of sediments during this stage resemble to that of modern Yellow River. From the above we can conclude that grain size character not only reflects the changes of hydrological conditions which connect to sea-level changes, but explain the changes of material source, especially reflect the various degree impact of materials from the Yellow River on Bohai Bay during different stages of the Holocene. In addition, the skew is obviously different from other parameters whose relational coefficient is less than 0.5, this is the reason why we should make a difference between the skew and other parameters. |
| Key words: Holocene Bohai Bay sediments grain size characteristics |
