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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Distribution of hydrous components in jadeite of the Dabie Mountains
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Distribution of hydrous components in jadeite of the Dabie Mountains

机译：大别山翡翠中含水分量的分布

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摘要

Two kinds of jadeite occur in the jadeite–quartzite from the Dabie Mountains, Eastern China: associated either with weak or strong deformation. The former shows a uniform composition while the latter shows both uniform and zoning composition. These jadeites were examined with infrared (IR) spectroscopy. All jadeite displays hydroxyl (OH) stretching bands, implying that hydrous components commonly exist in jadeite. The concentration of the hydrous components in the jadeite with weak deformation is homogenous, whereas the concentration of the hydrous components in strongly deformed samples is variable. The correlation between the intensity of OH-band absorbance and compositional zoning of jadeite with strong deformation indicates that Na-rich jadeite can accommodate more OH than Na-poor jadeite. Its interpretation is that there is more Na associated with greater OH availability in the initial crystallization environment. Our data of the comparatively high OH concentrations recorded in the core of the jadeite which contains relative high vacancies in M2 site imply that both OH content and the vacancies in M2 site could decrease during exhumation of the jadeite–quartzite. The decrease of OH solubility in jadeite would result in the formation of H2O fluid during the early exhumation of UHP metamorphic rocks. The H2O fluid transformed from OH during exhumation could trigger and enhance the early retrograde metamorphism of the host rocks and facilitate plastic deformation of jadeite grain by dislocation creep and diffusion creep.
机译：中国东部大别山的翡翠－石英岩中存在两种翡翠：与弱变形或强变形有关。前者显示均匀组成，而后者显示均匀组成和分区组成。用红外（IR）光谱检查了这些翡翠。所有翡翠均显示羟基（OH）拉伸带，这意味着翡翠中通常存在含水成分。变形较弱的翡翠中含水成分的浓度是均匀的，而变形严重的样品中含水成分的浓度是可变的。 OH带吸收强度与变形强的翡翠组成区带之间的相关性表明，富Na翡翠比贫Na翡翠能容纳更多的OH。其解释是，在初始结晶环境中，更多的Na与更高的OH可用性相关。我们在翡翠岩心中记录的相对较高的OH浓度数据表明，在翡翠-石英岩的掘出过程中，OH含量和M2晶界中的空位都可能降低，而M2位置中的空隙率相对较高。玉石中OH溶解度的降低将导致UHP变质岩早期掘出过程中H 2 O流体的形成。掘尸过程中从OH转化而来的H2O流体可以触发并增强基质岩石的早期逆行变质作用，并通过位错蠕变和扩散蠕变促进翡翠晶粒的塑性变形。

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