曹妃甸近岸及周边海区碎屑矿物组成特征及其环境意义

发布时间：2018-01-16 19:05

本文关键词：曹妃甸近岸及周边海区碎屑矿物组成特征及其环境意义　出处：《海洋科学》2016年08期 　论文类型：期刊论文

【摘要】：为探讨曹妃甸近岸及周边海区沉积物碎屑矿物组成特征以及曹妃甸大规模围填海工程对其影响,作者对2013年10月采自曹妃甸及周边海区的表层沉积物样品采用轻重矿物分离的方法进行了鉴定。结果表明:大规模围填海工程在改变曹妃甸岸线形态的同时也改变了其冲淤环境,使得碎屑矿物组分在大规模围填海前后发生一定变化。研究区的沉积物整体以轻矿物为主,平均含量为97.83%,其中曹妃甸近岸平均含量为95.57%;重矿物平均含量为2.17%,其中曹妃甸近岸平均含量为4.43%。研究区的重矿物优势矿物主要有普通角闪石、绿帘石和自生黄铁矿,其中普通角闪石所占比例在曹妃甸近岸达到最高值(36.41%);轻矿物的优势矿物主要有石英、斜长石和风化碎屑,其中石英所占比例也在曹妃甸近岸达到最高值(62.72%)。研究发现,曹妃甸近岸沉积物碎屑矿物相对含量增加而重矿物基本不变,这在一定程度上揭示了大规模人工围填海工程对曹妃甸近岸及周边海区沉积环境的影响。
[Abstract]:In order to study the characteristics of clastic mineral composition of sediments in Caofeidian inshore and its surrounding sea area and the influence of large-scale reclamation project in Caofeidian. In October 2013, the surface sediment samples collected from Caofeidian and its surrounding sea areas were identified by the method of heavy and heavy mineral separation. The large-scale reclamation project has changed the shape of Caofeidian shoreline and the environment of scouring and silting at the same time. The composition of clastic minerals changes before and after large-scale reclamation. The sediment in the study area is mainly composed of light minerals with an average content of 97.83%. The average content of Caofeidian was 95.57m. The average content of heavy minerals is 2.17, of which the average content of Caofeidian is 4.43.The dominant minerals of heavy minerals in the study area are mainly common hornblende, verdant and authigenic pyrite. The proportion of common hornblende reached the highest value in Caofeidian inshore (36.41%). The dominant minerals of light minerals are mainly quartz plagioclase and weathered detritus in which the proportion of quartz has reached the highest value in Caofeidian inshore (62.72). The relative contents of clastic minerals in the sediments of Caofeidian inshore increased while the heavy minerals remained unchanged, which to some extent revealed the influence of large-scale artificial reclamation projects on the sedimentary environment of Caofeidian inshore and its surrounding sea areas.
【作者单位】：鲁东大学资源与环境工程学院;中国科学院烟台海岸带研究所;成都信息工程学院资源环境学院;青岛大学环境科学与工程学院;
【基金】：中国科学院重点部署项目(KZZD-EW-14);中国科学院“一三五”规划生态突破项目(Y254021031) 国家自然科学基金(41171424,41371104)~~
【分类号】：P736.3
【正文快照】： 海底表层沉积物中碎屑矿物的含量与分布情况复杂,影响因素较多。海底沉积环境取决于堆积环境中的水动力条件以及物理、化学和生物过程[1]。碎屑矿物是物源和环境的产物,也是搬运营力对沉积物长期作用的结果。因此,开展碎屑矿物研究对明确地质环境及其演化有重要参考价值。特别

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