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废黄河口门外砂质海滩粒度和重矿物特征及其成因机理分析
王孟瑶1, 金秉福1, 王昕2, 李坤2
1.鲁东大学;2.鲁东大学 海岸研究所/资源与环境工程学院
摘要:
废黄河口门外条带状粉砂质和淤泥质海岸中受水动力强烈分选而出现小范围砂质海滩,其物质组成与形成机制独具特色。为研究黄河南流变迁过程中物质沉积分异作用下的产物,进而追踪废黄河沉积物在江苏沿海以及南黄海的运移状况,本文测量废黄河口门外砂质海滩沉积物粒级组成及特征参数,分析各样品重矿物含量及种类特征;结合与废黄河陆上沉积物的对比,探讨在不同沉积分异作用下重矿物沉积特征。结果表明:砂质海滩沉积物平均粒度2.67Φ(0.16mm),分选较好,为微负偏,具有海滩砂粒度特征;陆域样沉积物粒度跨度大,以粉砂组分为主,为河流沉积特征。另外,对海滩砂样进行广粒级重矿物(1~6Φ)分析,重矿物含量在极细砂和粗粉砂粒级中含量最高,不同粒级形成不同的矿物组合,砂粒级重矿物组合为黑云母+普通角闪石+褐铁矿,粉砂粒级则为钛铁矿+石榴子石+普通角闪石;砂质海滩样品广粒级重矿物重量含量为3.66%,其中3~4Φ(0.125~0.063mm)粒级重矿物重量含量高达15.66%,比重大且稳定性较高的矿物在此粒级中富集,表明海滩重矿物分选强烈。
关键词:  重矿物  沉积分异  粒度分析  砂质海滩  废黄河口
DOI:10.11759/hykx20180827001
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Characteristics of grain size and heavy minerals of sandy beach outside the abandoned Yellow River estuary and its genetic mechanism
WANG Mengyao1, JIN Bingfu1, WANG Xin2, LI Kun2
1.Ludong University;2.Institute of Coastal Research/College of Resources and Environmental Engineering,Ludong University
Abstract:
Owing to strong hydrodynamics, a small–scale sandy beach inhere the strip-shaped silty clay coast outside the abandoned Yellow River estuary, the material composition and formation mechanism is distinctive. For studying the products under the influence of material sedimentation in the process of the Yellow River''s southward transition, and tracking the migration process of the abandoned Yellow River sediments in the South Yellow Sea. This paper measures the grain size compositions and characteristic parameters of sediments in the sandy beach outside the abandoned Yellow River estuary, the heavy mineral content and species characteristics were analyzed of each sample. Combined with the comparison of the land sediments on the abandoned Yellow River estuary, characteristics of heavy mineral deposition under different sedimentary conditions were discussed. The results show that the average grain size of sandy beach sediments is 2.67Φ (0.16mm), which is better in sorting and slightly negative, it has the characteristics of beach sand grain size. The land size sediments have large particle size span, mainly composed of silt components. It is a feature of river sedimentation. In addition, the beach sand samples were analyzed for multiple-window (1~6Φ) heavy minerals. The heavy mineral content was highest in the fine sand and coarse silt grades. Different grades have different mineral combinations. The heavy mineral combination of sand grade is biotite+hornblende+limonite, and the heavy mineral combination of silt is ilmenite+garnet+hornblende. The sandy beach samples wide-grained heavy mineral weight content is 3.66%, 3~4Φ (0.125~0.063mm) fractions has a heavy mineral weight content of 15.66%. The minerals with higher specific gravity and higher stability are enriched in the fine sand grade of sandy beach samples, indicating that the heavy minerals in the beach are strongly sorted.
Key words:  heavy minerals  sedimentary differentiation  grain size analysis  sandy beach  the abandoned Yellow River entrance
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