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首页> 外文期刊>Mediterranean Marine Science >Grain size distribution, clay mineralogy and chemistry of bottom sediments from the outer Thermaikos Gulf, Aegean Sea, Greece
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Grain size distribution, clay mineralogy and chemistry of bottom sediments from the outer Thermaikos Gulf, Aegean Sea, Greece

机译：希腊爱琴海Thermaikos海湾外层的粒度分布，粘土矿物学和底部沉积物的化学性质

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The Thermaikos Gulf constitutes the NW part of the North Aegean Sea and is limited eastward from the Chalkidiki Peninsula and westward from the Pieria Prefecture. Its plateau covers an area of 3,500 km 2 . The mechanisms responsible for the grain size distribution into the Gulf, the clay mineralogy and the chemistry of some bottom sediments from the outer Thermaikos Gulf, are examined. Source mixing during transportation, flocculation, differential settling processes and organic matter appear to be the main mechanisms for the distribution of clay minerals in shallow waters. All grain size fractions studied present a wide range of values confirming the extreme variations of the discharged load and the variability in marine processes. Plagioclases predominate over K-feldspars, while quartz is the most abundant mineral present. In addition, micas, chlorites, amphiboles and pyroxenes exist as primary and/or accessory minerals in all samples. Among clay minerals, illite predominates over smectite and smectite over chlorite (+ kaolinite). The ordered interstratified phase of I/S, with 30-35% S layers, is present in the 2-0.25μm fraction. The randomly interstratified phase of I/S, with 50% S layers, is present in the <0.25& micro; m fraction. On average the clay mineral content of the studied samples is: 48% I, 23% S, 17% Ch (+K) and 12% others for the 2-0.25μm fraction and 50% I, 30% S and 20% Ch (+K) for the <0.25 μm fraction. All these minerals are the weathering products of the rocks from the drainage basins of the rivers flowing into the Gulf, as well as of the Neogene and Quaternary unconsolidated sediments of the surrounding coasts. The terrigenous input, the water mass circulation and, to a lesser extent, the quality of the discharged material and the differential settling of grains, control the grain size distribution within the outer Thermaikos Gulf. The chemical composition of the analysed samples is generally in agreement with their mineral composition and signifies their terrigenous origin presenting discretely clastic character.
机译：Thermaikos海湾是北爱琴海的西北部，从哈尔基迪基半岛向东限定范围，从皮埃里亚县向西限定范围。其高原面积为3500 km 2。考察了导致粒度分布到海湾的机制，粘土矿物学以及来自Thermaikos海湾外围的一些底部沉积物的化学作用的机理。在运输，絮凝，差异沉降过程和有机物的过程中，源混合似乎是粘土矿物在浅水中分布的主要机制。所研究的所有晶粒度分数均显示了宽范围的值，证实了卸料负荷的极端变化以及海洋加工过程中的变化性。斜长石在钾长石上占主导地位，而石英是目前最丰富的矿物。此外，云母，亚氯酸盐，闪石和辉石作为所有样品中的主要和/或辅助矿物存在。在粘土矿物中，伊利石比蒙脱石占多数，绿土比绿泥石（+高岭石）高。具有30-35％S层的I / S的有序层间相以2-0.25μm的比例存在。 I / S具有50％S层的随机分层相存在于<0.25＆micro;米分数。平均而言，所研究样品的粘土矿物含量为：2-0.25μm分数为48％I，23％S，17％Ch（+ K）和其他12％，以及50％I，30％S和20％Ch （+ K）表示<0.25μm的分数。所有这些矿物都是流入海湾的河流流域的岩石以及周围海岸的新近纪和第四纪未固结沉积物的风化产物。陆源的输入，水的质量循环以及较小程度的排出物料的质量和谷物的不同沉降，控制着外部Thermaikos海湾内的粒度分布。被分析样品的化学成分通常与其矿物成分相符，并​​表明其陆源起源具有离散的碎屑特征。

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