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首页> 外文期刊>Estuarine Coastal and Shelf Science >Composition and geochemistry of clay sediments offshore the northeastern Sicilian coast (Southeastern Tyrrhenian Sea, Italy)
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Composition and geochemistry of clay sediments offshore the northeastern Sicilian coast (Southeastern Tyrrhenian Sea, Italy)

机译：西西里东北部海岸（意大利第勒尼安海南部）近海黏土沉积物的组成和地球化学

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摘要

Grain-size, mineralogical and chemical analyses were carried out on fine fraction of sediments collected in the Gulfs of Patti and Milazzo, two borderland basins in the Southern Tyrrhenian extending offshore the northeastern Sicilian coast. Results of granulometric analyses on size fractions smaller than 63 |im showed that the investigated samples can be classified mainly as clayey silts. The coarse fractions (>63 nm), examined by optical microscopy, consist of a terrigenous component, representing in some samples about 98-99% of the total sediment, and by a biogenic component This latter is mainly made up of benthic Foraminifera. The mineralogical composition of the fine fraction, determined by X-Ray diffractometry, is represented by muscovite, quartz, clay minerals, carbonates (calcite) and, in some samples, by calcium and sodium-rich plagioclases. The method of saturation with K and Mg, followed by ethylene glycol solvation and heating, are used for a qualitative determination of the clay minerals. Clay mineralogical composition is characterized by the dominance of clinochlore and illite, with minor amounts of smectite (especially montmorillonite) and vermiculite. The chemical data reflect the main mineralogical composition showing a uniform quantitative composition, with high AI2O3 and S1O2 values and very few variations in the relative abundance of the other components. The Cr/Th, Th/Sc, Th/Co and La/Sc ratios suggest a felsic nature of the source rocks. Finally the geochemical parameters such as V/Cr, U/Th, Ni/Co and Cu/Zn ratios indicate that examined sediments were deposited under oxic environments.
机译：对在帕蒂湾和米拉佐湾（南第勒尼安州的两个边疆盆地）延伸的细小部分沉积物进行了粒度，矿物学和化学分析，该盆地位于西西里岛东北海岸的海上。粒度分数小于63μm的粒度分析结果表明，所研究的样品主要可分为黏土粉砂。通过光学显微镜检查的粗级分（> 63 nm）由陆源成分组成，在某些样品中约占总沉积物的98-99％，并由生物成分组成。后者主要由底栖有孔虫组成。通过X射线衍射法测定的细小部分的矿物学组成由白云母，石英，粘土矿物，碳酸盐（方解石）代表，在某些样品中，由富含钙和钠的斜长石代表。用K和Mg饱和的方法，接着乙二醇溶解和加热，用于定性测定粘土矿物。粘土矿物组成的特征是斜绿石和伊利石，少量的蒙脱石（尤其是蒙脱石）和ver石。化学数据反映出主要的矿物组成，显示出均匀的定量组成，具有较高的AI2O3和S1O2值，而其他组分的相对丰度变化很小。 Cr / Th，Th / Sc，Th / Co和La / Sc比表明烃源岩具有长质性。最后，地球化学参数（例如V / Cr，U / Th，Ni / Co和Cu / Zn比）表明所检查的沉积物是在有氧环境下沉积的。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2011年第4期|p.564-572|共9页
  • 作者

    Carmelo Sacca; Domenica Sacca; Preziosa Nucera; Anna De Fazio;

  • 作者单位

    Deportment of Earth Sciences, University of Messina, Viale F. Stagno d'Alcontres, 31-98166 S. Agata di Messina (ME), Italy;

    Deportment of Earth Sciences, University of Messina, Viale F. Stagno d'Alcontres, 31-98166 S. Agata di Messina (ME), Italy;

    Deportment of Earth Sciences, University of Messina, Viale F. Stagno d'Alcontres, 31-98166 S. Agata di Messina (ME), Italy;

    Deportment of Earth Sciences, University of Messina, Viale F. Stagno d'Alcontres, 31-98166 S. Agata di Messina (ME), Italy;

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  • 正文语种 eng
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  • 关键词

    patti; milazzo; southern tyrrhenian; clays; mineralogy; geochemistry;

    机译：帕蒂米拉佐第勒尼安南部;黏土矿物学;地球化学;

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