摘要
对采自莱州湾南岸的钻孔沉积物样品进行了粒度测试和分析。样品平均粒径介于3.3Φ-6.8Φ,以极细砂和粗粉砂为主,含有少量的黏土质;分选较差;偏度表现为正偏和极正偏;沉积物粒度表现为正态、正态-尖锐和尖锐,少数表现为平坦和极尖锐。粒度象图指示了历史时期持续高的初始沉积水动能和多种沉积环境的变化,粒度参数散点图反映了多种动能影响了沉积物的沉积改造,综合判别分析对沉积环境的限定,得到了莱州湾南岸沉积物受到河水径流、潮流、波浪等共同作用形成。沉积物总体反映了莱州湾南岸长时期处于河流相和三角洲相的沉积环境,少数较细的粒度表现可能与研究区的多期海侵过程相对应。结果表明了粒度的综合分析对渤海南部的沉积环境有良好的辨识,是判断沉积环境的重要指标。
Sediment samples from the borehole Lz908 of the Laizhou Bay were employed here for the grain-size and sedimentary analyses. The results showed that the average grain size was 3.3-6.8Φ with poor sorted, fine skewed and Platykurtic, which means the grain sizes ranged from coarse silt to very fine sand. The sediments settled in the southern of the Laizhou Bay were controlled by the river, tide and wave, and the fluvial effect was the dominant factor. It is inferred that the sediments deposited in a deltaic environment.
出处
《海洋科学》
CAS
CSCD
北大核心
2014年第5期107-113,共7页
Marine Sciences
基金
我国近海海洋综合调查与评价专项(908-01-ZH2)
海洋公益性行业科研专项(201105020)
黄土与第四纪地质国家重点实验室开放基金(SKLLQG1018)
关键词
粒度
沉积环境
莱州湾
海岸带
grain size
sedimentary environment
the Laizhou Bay
coastal zone
