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首页> 外文期刊>Facies >Topography controlling the wind regime on the karstic coast: late Pleistocene coastal calcareous sands of eastern mid-Adriatic, Croatia
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Topography controlling the wind regime on the karstic coast: late Pleistocene coastal calcareous sands of eastern mid-Adriatic, Croatia

机译：控制岩溶海岸风情的地形：克罗地亚克罗地亚亚得里亚海中东部晚更新世沿海钙质砂

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摘要

Aeolian dunes controlled by regional climate have been formed in many coastal areas of the Mediterranean Sea during the Quaternary. Generally, they are formed under a landward-blowing wind, and comprise numerous reworked penecontemporaneous shallow-marine carbonate grains. Along the eastern mid-Adriatic Sea, late Pleistocene aeolian and alluvial sands occur as isolated patches in karstic depressions on several islands and the Pelje?ac Peninsula. At most localities, the sands consist of a mixture of mostly carbonate rock fragments and siliciclastic material. A higher proportion of shallow-marine bioclasts was found only at one locality. The terrestrial material was transported to the coastal area by at least two rivers: paleo-Cetina and paleo-Neretva River, and was subsequently reworked and transported by wind, resulting in aeolian deposition. Sandy units of various thicknesses exhibiting sharp erosional bedding planes and cross-bedding are interpreted as representing aeolian dunes and sand sheets controlled by a complex wind regime. The mineralogical composition at almost all localities indicates nearriver flood plains as the main sand source. Although the area was affected by strong winds blowing landward and parallel to the coast, they significantly deviated due to the local topography produced by the tectonically deformed and karstified carbonate basement. In this way, the late Pleistocene aeolian deposits on the mid-Adriatic islands differ from deposits from most Quaternary Mediterranean coastal aeolian belts, as they contain very small quantities of penecontemporaneous shallow-marine carbonate grains and were deposited by winds blowing in varying directions instead of prevailing landward-blowing winds.
机译：在第四纪期间，地中海许多沿海地区都形成了受区域气候控制的风沙丘。通常，它们是在陆风的作用下形成的，并且包含许多重制的准同时期浅海洋碳酸盐颗粒。沿着亚得里亚海中部东部，晚更新世的风沙和冲积砂以孤立的斑块的形式出现在几个岛屿和佩列萨克半岛的岩溶洼地中。在大多数地方，沙子由碳酸盐岩碎屑和硅质碎屑物质的混合物组成。仅在一处发现了较高比例的浅海生物破骨细胞。陆上物质至少由两条河流（古塞提纳河和尼雷特瓦河）运到沿海地区，随后经过风处理和运输，导致风沙沉积。表现出尖锐的侵蚀层理平面和交叉层理的各种厚度的沙质单元被解释为代表由复杂的风况控制的风沙丘和沙床。几乎所有地方的矿物学组成都表明近江洪泛平原是主要的沙源。尽管该地区受到强风吹向陆地并平行于海岸的影响，但由于构造变形和岩溶化的碳酸盐基底所产生的局部地形，它们显着偏离。这样，亚得里亚海中部岛上的晚更新世风成沉积与大多数第四纪地中海沿海风成带不同，因为它们含有少量的准当代浅海碳酸盐颗粒，并且是由风向不同方向沉积而不是盛行陆风。

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