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首页> 外文期刊>Journal of Crystal Growth >Mineral replacement rate of olivine by chrysotile and brucite under high alkaline conditions
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Mineral replacement rate of olivine by chrysotile and brucite under high alkaline conditions

机译：高碱性条件下温石棉和水镁石对橄榄石的矿物替代率

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摘要

Olivine mineral replacement by serpentine is one major alteration reaction of oceanic hydrothermal-ism. In the present experimental study, olivine grains were replaced by chrysotile and brucite under high alkaline conditions. In our study, olivine replacement implied a spatial and temporal coupling of dissolution and precipitation reactions at the interface between olivine and chrysotile-brucite minerals. Coupled dissolution-precipitation led to the alteration of starting olivine grains (so-called primary or parent mineral) to a porous mineral assemblage of chrysotile and brucite with preservation of the initial olivine morphology. This mineral replacement reaction of olivine (serpentinization) has been characterized using XRD, FESEM and FTIR measurements. Moreover, a simple and novel method is here proposed to quantify the mineral replacement rate (or serpentinization rate) of olivine using thermogravimetric (TG) and differential TG (DTG) analyses. Serpentinization extent depends on the grain size: it is complete after 30 days of reaction for the smallest olivine grains (< 30 urn), after 90 days of reaction for the intermediate olivine grains (30 μm-56 μrn). For the largest fraction (56-150 μm), 55% of serpentinization extent was reached after 90 days. Based on the fitting of the serpentinization extent (ξ_t) versus time (t) using a kinetic pseudo-second-order model, the serpenti-nization rates vary from 3.6×1O~(-6)s~(-1) to 1.4×10~(-7)s~(-1) depending on the olivine grain size. An additional correlation between FTIR spectra analysis and TG measurements is proposed. The mineral replacement reactions frequently observed in natural alteration processes could be a powerful synthesis route to design new porous and/or nanostructured materials.
机译：蛇纹石替代橄榄石矿物是海洋热液作用的主要改变反应之一。在本实验研究中，在高碱性条件下，橄榄石颗粒被温石棉和水镁石代替。在我们的研究中，橄榄石的置换意味着在橄榄石和温石棉-brucite矿物之间的界面溶解和沉淀反应的时空耦合。耦合的溶解-沉淀作用导致起始橄榄石晶粒（所谓的主要矿物或母体矿物）转变为温石棉和水镁石的多孔矿物组合，并保留了原始橄榄石形态。橄榄石的这种矿物替代反应（蛇纹石化）已使用XRD，FESEM和FTIR测量进行了表征。此外，在此提出一种简单新颖的方法，使用热重（TG）和差分TG（DTG）分析来量化橄榄石的矿物替代率（或蛇纹石化率）。蛇纹石化程度取决于晶粒大小：最小的橄榄石晶粒（<30 um）在反应30天后完成，中间橄榄石晶粒（30μm-56μm）在反应90天后完成。对于最大部分（56-150μm），在90天后达到了55％的蛇纹化程度。利用动力学拟二阶模型根据蛇形化程度（ξ_t）对时间（t）的拟合，蛇形化率从3.6×1O〜（-6）s〜（-1）到1.4× 10〜（-7）s〜（-1）取决于橄榄石的晶粒尺寸。提出了FTIR光谱分析和TG测量之间的其他相关性。在自然改变过程中经常观察到的矿物替代反应可能是设计新型多孔和/或纳米结构材料的强大合成途径。

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  • 来源
    《Journal of Crystal Growth》 |2012年第1期|p.62-72|共11页
  • 作者

    Romain Lafay; German Montes-Hernandez; Emilie Janots; Rodica Chiriac; Nathaniel Findling; Francois Toche;

  • 作者单位

    Institut des Sciences de la Terre (ISTerre), UJF-CNRS, F-38041, Grenoble I, Cedex 9, France;

    Institut des Sciences de la Terre (ISTerre), UJF-CNRS, F-38041, Grenoble I, Cedex 9, France;

    Institut des Sciences de la Terre (ISTerre), UJF-CNRS, F-38041, Grenoble I, Cedex 9, France;

    Universite Lyon 1, Laboratoire des Multimateriaux et Interfaces UMR CNRS 5615, 43 bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France;

    Institut des Sciences de la Terre (ISTerre), UJF-CNRS, F-38041, Grenoble I, Cedex 9, France;

    Universite Lyon 1, Laboratoire des Multimateriaux et Interfaces UMR CNRS 5615, 43 bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A1. Mineral replacement rate; A1. Serpentinization; A1. TG analyses; B1. Alkaline medium; B2. Chrysotile nanotubes;

    机译：A1。矿物替代率;A1。蛇纹化;A1。 TG分析;B1。碱性介质;B2。温石棉纳米管;

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