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High-pressure phase transitions and hydrogen incorporation into MgSiO3 enstatite

机译：高压相变和氢掺入MgSiO3顽辉石

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摘要

Hydrogen incorporation into orthoenstatite (Pbca), low-clinoenstatite (P21/c), and high-pressure clinoenstatite (C2/c) has been investigated using polarized and unpolarized infrared spectroscopy. Using shifts in OH stretching frequencies between the spectra and data from different crystal models, we test various models for hydrogen incorporation. The only significant differences between orthoenstatite and low-clinoenstatite spectra relate to anisotropy of the higher wavenumber bands, which implies a change in orientation of longer OH dipoles between the two structures. High-pressure clinoenstatite reverts to low-clinoestatite during depressurization, but subtle differences are noted between IR spectra of samples synthesized in the high-pressure clinoenstatite and low-clinoenstatite stability fields. Differences probably relate to the splitting of oxygen sites into two sets of non-equivalent sites during transformation of high-pressure clinoenstatite. The most realistic models for hydrogen incorporation into all three polymorphs involve association of hydrogen with the underbonded O2a and O2b sites. However, changes in OH dipole orientation between the different polymorphs and the effects of phase transitions on water solubility in the system MgSiO3 mean the effects and implications of hydrogen incorporation into the three polymorphs may differ considerably.
机译：已研究了氢掺入原钙长石（Pbca），低斜发钙长石 （P2 1 / c）和高压斜发钙长石（C2 / c） 位移和来自不同晶体模型的 数据之间的距离，我们测试了各种模型的 氢掺入。 正钙钛矿和低斜硅钙石光谱之间的唯一显着差异与较高波数带的各向异性 有关，这意味着更长OH的方向 发生了变化两个结构之间的偶极子。降压过程中，高压 斜硅钙石转变为低斜硅钙石， 但高压斜硅钙石合成的样品 的红外光谱之间存在细微差异和低斜方岩长石 稳定性字段。差异可能与在高压斜铁辉石的 转化过程中将氧位 分裂成两组非等价位有关。氢掺入所有三个多晶型物的最现实的 模型 涉及氢与未键合的O2a和 O2b位的缔合。但是， 不同多晶型之间的OH偶极取向变化以及相变 对MgSiO 3 系统中水溶性的影响意味着 将氢掺入这三种多晶型物的 的含义可能相差很大。

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    《American Mineralogist》 |2006年第7期|1094-1101|共8页
  • 作者

    Geoffrey David Bromiley; Fiona Anne Bromiley;

  • 作者单位

    Bayersiches Geoinstitut, Universit?t Bayreuth, 95440 Bayreuth, Germany|Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, U.K.;

    Bayersiches Geoinstitut, Universit?t Bayreuth, 95440 Bayreuth, Germany;

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