爱琴海东北部埃夫罗斯河三角洲前缘和前三角洲现代基本过程的思考

Θ. Δ. Κανελλοπουλοσ, Β. Καψιμαλησ, Μ. Ο. Αγγελιδησ, Ε. Καμπερη, Α. Καραγεωργησ
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引用次数: 0

摘要

埃夫罗斯河三角洲前缘和前三角洲重力岩心资料证实了埃夫罗斯河三角洲沉积倾向于西西北方向,沿当地水动力体系的主方向,阻止了对称全新世棱镜的形成。在三角洲前缘,陆源沉积物主要由细粒物质组成。垂向序列单调,粒度和颜色差异不大,内部构造和流产纹层缺失,表明沉积过程几乎不变,流量波动长期。河流携带的沙子是有限的,因为它被困在河口,但有时,在极端条件下(河水流量高的时期,短暂的灾难性事件等),可以运输到亚历山德鲁波利斯海湾的广阔地区。可忽略的生物源含量和没有生物扰动效应归因于高沉积速率。当沉积速率暂时降低时,会产生一些生物扰动层。前三角洲沉积分布格局呈明显的东-东南-西-西北带状分布。中部以泥质为主,两侧砂质含量逐渐增加,成为靠近海岸和海湾外高原的主要相。上盖层垂向相序列复杂,粒度、颜色、生物含量变化多端,反映出沉积方式的复杂性。该地区的主要支线是埃夫罗斯河,它提供了大量的悬浮荷载。另一个重要的沙源来自海岸线,在风暴条件下,海岸线为海岸提供了粗粒度的物质。最后,当地重要的沉积物供应者,卢特罗斯河,影响了亚历山德鲁波利斯东部地区,形成了一个小的水下扇。在公海上,现代沉积作用的后果可以忽略不计。研究区表层和次表层沉积物的砂质特征、生物成因碎片的分析以及与现今陆源源的距离较远,表明研究区西南部上部沉积物可能具有遗存成因。210Pb剖面基本一致,表明三角洲前缘沉积速率大于2 cm/yr,向海约8 km处沉积速率降至0.2 cm/yr。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Consideration of modern sendimentary processes of the Evros river delta front and prodelta, NE Aegean sea
Gravity cores data from the Evros River delta front and prodelta confirm the aspect that the Evros River deltaic deposits tend to west-northwest, along the main direction of the local hydrodynamic regime, preventing the construction of a symmetrical Holocene prism. In the delta front, the terrigenous sediment consists mostly of fine-grained material. Its vertical succession is monotonous with slight differences in grain size or colour, and lack of internal structure or current-produced laminae, indicating almost immutable sedimentary processes as well as long-term discharge fluctuations. The river-borne sand is limited because of its entrapment in the river mouth but sometimes, during extreme conditions (periods of high river discharge, short-lived catastrophic events etc.), can be transported seawards covering an extensive area of the Alexandroupolis Gulf. The negligible biogenic content and the absence of bioturbation effects are attributed to the high rates of deposition. Some bioturbated horizons are produced when sedimentation rates decrease temporarily. The prodelta sediment distribution patterns occur a distinctive zonation along an east-southeast to westnorthwest trend. In the central part, mud dominates, while on both sides of this area, the content of sand gradually increases and becomes the prevalent facies near the coast and in the outer plateau of the gulf. The vertical facies sequences of the upper sedimentary cover are complicated, with many variations in grain size, colour and biogenic content reflecting a complicated manner of deposition. The major feeder of this area is the Evros River providing great amounts of suspended load. Another remarkable source of sand is derived from the coastline, which during storm conditions provides coarse-grained material in the shoreface area. Finally, a sediment supplier of local importance, Loutros River, affects the eastern area of Alexandroupolis building up a small subaqueous fan. In the open sea, the consequences of the modern sedimentation are negligible. The sandy character of the surface and sub-surface sediments, the analysis of biogenic fragments, the long distance from the present-day terrigenous sources are some evidences which lead to the view that the upper sediment body of the southwestern part of the study area has a presumable relict origin. 210Pb profiles are, more of less, consistent showing a sedimentation rate more than 2 cm/yr in the delta front, which decreases to 0.2 cm/yr at about 8 km seaward.
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