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首页> 外文期刊>Contributions to Mineralogy and Petrology >Phase relations of a serpentine composition between 5 and 14 GPa: significance of clinohumite and phase E as water carriers into the transition zone
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Phase relations of a serpentine composition between 5 and 14 GPa: significance of clinohumite and phase E as water carriers into the transition zone

机译：蛇纹石成分在5至14 GPa之间的相位关系：斜长石和E相作为水进入过渡区的水载体的意义

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摘要

Run products from high pressure experiments at 800–1,200 °C and 5–14 GPa (corresponding to depths of 150 to 420 km) on a serpentine bulk composition [close to Mg3Si2O5(OH)4] were analysed by optical microscopy, micro-Raman spectroscopy and electron microprobe. All charges exhibit strong chemical zoning. Fluid, melt and hydrous solids were mostly concentrated at the top, bottom and along the wall of the capsules. The central part of the charge was devoid of H2O. Both fluid and hydrous magnesian phases exhibit a Mg/Si ratio higher than forsterite. In contrast, the centre of the capsule was enriched in SiO2. The observed zoning can neither be explained by gravitational settling nor by a thermal gradient alone. Most likely the fluid was separated from the solids by surface forces and thereby established the chemical gradient by preferentially dissolving MgO. If strong chemical zoning is taken into account, the occurrence of more phases than allowed by the phase rule can be explained by separating the bulk into several domains of different bulk compositions. Results indicate that small amounts of F increase the stability field of clinohumite, Mg9Si4O16(OH,F)2, compared to OH-clinohumite in pure MSH previously reported. Clinohumite coexists with enstatite up to 975 °C at 5 GPa, and up to 1,100 °C at 12 GPa. At 14 GPa (close to the α/β-Mg2SiO4 transition) phase E becomes the most important water carrier. The new results indicate that clinohumite could be an important mantle mineral for transporting water into the Earth's transition zone due to its high thermal stability compared to other important water carriers such as serpentine and phase A.
机译：在蜿蜒的散装成分[接近Mg3 Si2 O5 上，在800–1,200°C和5–14 GPa（对应于150至420 km的深度）上进行高压实验的产品（OH）4 ]通过光学显微镜，显微拉曼光谱和电子探针进行了分析。所有电荷均显示出强烈的化学区带。流体，熔体和含水固体大部分集中在胶囊的顶部，底部和沿壁。装料的中心部分没有H2 O。镁和镁的水相和镁相都比镁橄榄石高。相反，胶囊的中心富含SiO2 。不能通过重力沉降或仅通过热梯度来解释观测到的分区。极有可能通过表面力将流体与固体分离，从而通过优先溶解MgO来建立化学梯度。如果考虑到强烈的化学分区，则可以通过将块体分成不同块体组成的多个域来解释发生的相多于相规则所允许的范围。结果表明，与以前报道的纯MSH中的OH-斜发石相比，少量F可以增加斜发石，Mg9 Si4 O16 （OH，F）2 的稳定性。 。斜辉石与顽辉石共存，在5 GPa时高达975°C，在12 GPa时高达1100°C。在14 GPa（接近α/β-Mg2 SiO4 过渡）时，E相成为最重要的水载体。新的结果表明，斜长石与蛇纹石和A相等其他重要的水运载体相比，具有很高的热稳定性，因此它可能是将水输送到地球过渡带的重要地幔矿物。

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  • 来源
    《Contributions to Mineralogy and Petrology》 |2001年第6期|670-679|共10页
  • 作者

    Roland Stalder; Peter Ulmer;

  • 作者单位

    Institut für Mineralogie Petrographie Sonneggstrasse 5 ETH Zentrum 8092 Zürich Switzerland;

    Institut für Mineralogie Petrographie Sonneggstrasse 5 ETH Zentrum 8092 Zürich Switzerland;

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