黑海多瑙河-德涅斯特河段现代海滩沉积物(岩性和成因)

V. Nesterovsky, M. Deyak, A. Tarnovetskyi
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引用次数: 0

摘要

研究了黑海西北海岸从Liman村(Katran spit)到Carolino-Bugaz村(Odesa地区)一带的滩积沉积。研究区海岸线长度约为86公里。下列形式的泳滩分布广泛:吐咀、溢滩、倾斜泳滩。在夏季期间,采用相同的方法从所有类型的海滩洼地中采集并分析了35个样本。在无风暴期间,在近海岸海滩中部(水位与海岸之间)以及离海岬和吐槽水边5-7米距离的所有可到达的海滩沉积物采样地点进行采样。为此,使用容量为1升的标准塑料容器。样品取自距离表面30 cm的深度,剥离面积为30´30 cm。在每个测点进行海岸带构造和滩积特征的描述,然后记录在航海日志中,并通过GPS系统与坐标相连接。进行了粒度和矿物学分析。结果表明,各类型滩涂沉积物的颗粒组成以0.25 ~ 0.5 mm组分为主,占66%,0.1 ~ 0.25 mm组分占30%。在最小的数量,有粗粒和粗粒石馏分。钻粒沙石和淀粉砾石组分的主要定位位置是受海岸潮汐作用影响较小的地区。然而,在流体动力活动增加的时期(秋冬),发生了额外的物质再悬浮,这导致沉积物中的其他部分被置换并转移到海边。海滩沉积物含90-95%石英。其它有方解石、长石、云母等工业物质。矿石矿物以磁铁矿、石灰球、钛铁矿、酸性石榴石、橄榄石、放光石为代表。研究区海岸滩沉积形成的陆源物质主要来源于水下滩、德涅斯特河的河水流和海岸磨蚀作用。沿敖德萨至多瑙河的沿海河流方向沉积物分布最强。总的来说,这段海岸的海滩沉积物是环境清洁的,没有放射性矿物,人造物质的含量不超过0.1%。
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Modern beach sediments of the Danube — Dniester segment of the Black Sea (lithology and genesis)
The acumulative beach deposits of the western-north coast of the Black Sea in the area from the village of Liman (Katran spit) to the village of Carolino-Bugaz (Odesa region) have been studied. The length of the coastal line in the study area is approximately 86 km. The following forms of beach areas are widespread here: spit, spills, sloping beaches. 35 samples were taken and analyzed from all types of beach depressions by the same methodology during the summer period. The sampling was carried out at all accessible for sampling places of beach deposits from the middle part of the near5shore beaches (between the water level and the shore) and at a distance of 5—7 m from the water’s edge on the headlands and spits in the period when there are no storms. For this purpose standard plastic containers with a capacity of 1 liter were used. The samples were taken from a depth of 30 cm from the surface with a stripping area of 30´30 cm. At each point the description of the coastal zone structure and the character of beach deposits was carried out, then recorded in the logbook and were connected to the coordinates by GPS system. Granulometric and mineralogical analysis was carried out. It was determined that fractions 0,25—0,5 mm prevail in the granulometric composition among all types of beach deposits, which makes 66%, and 0,1—0,25 mm — 30%. In the minimum quantities there are coarse-grained and aleuropelite fractions. The main places of localization of drilled-grained psammite and aleuropelite fractions are the areas with low influence of coastal tidal processes. However, during the periods of increased hydrodynamic activity (autumn5winter), additional resuspension of material takes place, which results in displacement of other fractions from the deposits and their transfer to the seaside. Beach sediments are 90—95% quartz. The other — calcite, feldspar, mica, technogenic substances. Ore minerals are represented by magnetite, lime spheroids, ilmenite, acerbic garnets, stavrolite, actinolite. The main sources of terrigenous material for the formation of beach deposits on the studied area of the coastline are: underwater bench, river flow of the Dniester and the coastal abrasion. The direction along the coastal stream from Odessa to the Danube is the strongest in the distribution of sediments. In general, the beach deposits of this segment of the coastare environmentally clean, with no radioactive minerals and the content of man5made material does not exceed 0,1%.
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