摘要
本文通过对位于莱州湾南侧、潍坊港东侧近岸海域300cm长的WF01钻孔进行磁化率和粒度测试,结合测年数据,分析了研究区海域沉积速率、沉积物粒度和磁化率的演化特征,探讨了不同沉积物粒度组分与磁化率变化的相关关系。结果表明:WF01孔0~300cm沉积物可分为四段,分别体现了不同时期研究区沉积环境的变化。WF01孔以218cm为界,上段与下段沉积物磁化率与各粒组百分含量的相关关系基本呈相反趋势。上段沉积物磁化率与63μm以下各组分的百分含量呈负相关关系,与大于63μm粗颗粒的百分含量呈正相关;下段沉积物磁化率值与小于32μm各组分的百分含量呈正相关关系,而与大于32μm的颗粒组分含量呈负相关关系。这种相关性的差异,可以从很大程度上指示研究区上下两段沉积物物质来源的不同,而造成这种物源差异的原因很可能是1855年黄河从苏北改道进入渤海,巨量黄河泥沙在渤海沉积、扩散造成的。
The magnetic susceptibility and grain size of a marine sediment core WF01, located in the east side of Weifang port, were measured and the correlation between them was analyzed. In results, sediments of the drill hole could be divided into four sections, indicating depositional environment change during different periods. The correlation coefficient between magnetic susceptibility and the mean grain size was op- posite at 218 cm. The correlation coefficient of magnetic susceptibility with the content below 63 μm was negative, and with the content greater than 63 gm was positive in the depth of 0-218 cm. The correlation coefficient of magnetic susceptibility with the content below 32 μm was positive, and with the content greater than 63 μm was negative in the depth of 218-300 cm. The verschiedenheit indicates the differences of sediments source in the two section, and this was mainly because that the modern Yellow River delta was formed since 1855 when a major switch took place at Tongwaxiang and most suspended load ap- peared to diffuse and deposit in the Bohai Sea.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第6期104-111,共8页
Periodical of Ocean University of China
基金
国家自然科学基金委员会-山东省人民政府海洋科学研究中心联合资助项目(U1606401)
中央级公益性科研院所基本科研业务费专项(2015G08)资助~~
关键词
粒度
磁化率
210Pb测年
沉积环境演变
莱州湾南岸
grain size
magnetic susceptibility
210pb dating
sedimentary environment changes
South Laizhou Bay
