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为探讨曹妃甸近岸海区表层沉积物粒度和粘土矿物组成和分布特征,利用激光粒度仪和X-射线衍射(XRD)分析的方法对曹妃甸近岸海区15个表层沉积物样品进行分析。结果表明:曹妃甸近岸海区沉积物以粉砂为主(45.2%),其次是砂(30.2%)和粘土(24.6%);研究区内四种粘土矿物含量依次为伊利石(55.8%)>蒙皂石(24.9%)>绿泥石(9.9%)>高岭石(6.7%)。研究表明曹妃甸近岸表层沉积物含量和分布特征受物源、水动力等自然因素和围填海工程等人为因素共同影响;其中,围填海工程的长期实施对研究区表层沉积物中较细颗粒(粉砂和粘土)的分布影响较为明显;伊利石、高岭石和绿泥石分布特征与围填海导致的水动力改变密切相关。研究结果对曹妃甸近岸海区的沉积特征及沉积物物源、了解围填海工程对海洋沉积环境的影响有着一定的科学意义。
In order to investigate the surface sediment particle size and clay mineral composition and distribution characteristics in the coastal area of Caofeidian, 15 surface sediment samples from the coastal area of Caofeidian were analyzed by laser particle size analyzer and X-ray diffraction (XRD). The results show that the sediments in Caofeidian coastal area are dominated by silt (45.2%), followed by sand (30.2%) and clay (24.6%). The contents of four clay minerals in the study area are illite (55.8%), Smectite (24.9%)> chlorite (9.9%)> kaolinite (6.7%). The research shows that the surface sediment content and distribution characteristics of the coastal areas in Caofeidian are affected by natural factors such as source and hydrodynamic forces and human factors such as reclamation projects. Among them, The distribution of particles (silt and clay) is more obvious. The distribution characteristics of illite, kaolinite and chlorite are closely related to the hydrodynamic changes caused by reclamation. The research results have certain scientific significance to the sedimentary characteristics and source of sediment in the coastal area of Caofeidian, and to understand the impact of reclamation project on the marine sedimentary environment.