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首页> 外文期刊>Clays and clay minerals >ILLITIZATION OF EARLY PALEOZOIC K-BENTONITES IN THE BALTIC BASIN: DECOUPLING OF BURIAL- AND FLUID-DRIVEN PROCESSES
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ILLITIZATION OF EARLY PALEOZOIC K-BENTONITES IN THE BALTIC BASIN: DECOUPLING OF BURIAL- AND FLUID-DRIVEN PROCESSES

机译：波罗的海盆地早古生代钾膨润土的无菌化：渗流和渗流过程的解耦

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摘要

The mineralogical characteristics of Ordovician and Silurian K-bentonites in the Baltic Basin were investigated in order to understand better the diagenetic development of these sediments and to link illitization with the tectonothermal evolution of the Basin. The driving mechanisms of illitization in the Baltic Basin are still not fully understood. The organic material thermal alteration indices are in conflict with the illite content in mixed-layer minerals. The clay fraction of the bentonites is mainly characterized by mixed-layered illite-smectite and kaolinite except in the Upper Ordovician Katian K-bentonites where mixed-layer chlorite-smectite (corrensite) occurs. The variation in expandability plus other geological data suggest that the illitization of Ordovician and Silurian K-bentonites in the Baltic Basin was controlled by a combination of burial and fluid driven processes. The illitization in the south and southwest sectors of the basin was effected mainly by burial processes. The influence of the burial process decreases with decreasing maximum burial towards the central part of the basin. The advanced illitization of the shallow-buried succession in the north and northwest sectors of the basin was enhanced by the prolonged flushing of K-rich fluids in relation to the latest phase of development of the Scandinavian Caledonides ~420-400 Ma.
机译：研究波罗的海盆地奥陶纪和志留纪钾膨润土的矿物学特征，以便更好地了解这些沉积物的成岩作用，并将非化作用与盆地的构造热演化联系起来。波罗的海盆地非法化的驱动机制仍不完全清楚。有机物的热蚀变指数与混合层矿物中的伊利石含量冲突。膨润土的粘土成分的主要特征是混合层伊利石-蒙脱石和高岭石，除了在上奥陶纪凯田钾钾膨润土中发生了混合层的绿泥石-蒙脱石（堇青石）。可膨胀性的变化以及其他地质数据表明，波罗的海盆地奥陶纪和志留纪钾膨润土的非法化是由埋藏和流体驱动过程共同控制的。流域南部和西南部的非法化主要是通过埋葬过程来实现的。随着朝向盆地中心部分的最大埋葬量的减少，埋葬过程的影响减小。与斯堪的纳维亚喀里多尼斯〜420-400 Ma的最新发展阶段相比，富钾流体的长期冲洗延长了该盆地北部和西北部浅埋演替的高级非法化程度。

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  • 来源
    《Clays and clay minerals》 |2010年第3期|P.388-398|共11页
  • 作者

    Peeter Somelar; Kalle Kirsimaee; Rutt Hints; Juho Kirs;

  • 作者单位

    Department of Geology, University of Tartu, Ravila 14a, 50411 Tartu, Estonia;

    Department of Geology, University of Tartu, Ravila 14a, 50411 Tartu, Estonia;

    Department of Geology, University of Tartu, Ravila 14a, 50411 Tartu, Estonia Estonian Museum of Natural History, Lai 29a, 10133 Tallinn, Estonia;

    rnDepartment of Geology, University of Tartu, Ravila 14a, 50411 Tartu, Estonia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    baltic basin; illite-smectite; illitization; K-bentonite;

    机译：波罗的海盆地伊利石-蒙脱石非法化膨润土;

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