H_2O storage capacity of olivine and low-Ca pyroxene from 10 to 13 GPa: consequences for dehydration melting above the transition zone

T. J. Tenner; M. M. Hirschmann; A. C. Withers

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H_2O storage capacity of olivine and low-Ca pyroxene from 10 to 13 GPa: consequences for dehydration melting above the transition zone

机译：橄榄石和低钙辉石在10 GPa至13 GPa的H_2O储存能力：过渡区上方脱水融化的后果

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The onset of hydrous partial melting in the mantle above the transition zone is dictated by the H_2O storage capacity of peridotite, which is defined as the maximum concentration that the solid assemblage can store at P and T without stabilizing a hydrous fluid or melt. H_2O storage capacities of minerals in simple systems do not adequately constrain the peridotite water storage capacity because simpler systems do not account for enhanced hydrous melt stability and reduced H_2O activity facilitated by the additional components of multiply saturated peridotite. In this study, we determine peridotite-saturated olivine and pyroxene water storage capacities at 10-13 GPa and 1,350-1,450°C by employing layered experiments, in which the bottom ~ 2/3 of the capsule consists of hydrated KLB-1 oxide analog peridotite and the top ~ 1/3 of the capsule is a nearly monomi-neralic layer of hydrated Mg# 89.6 olivine. This method facilitates the growth of ~ 200-um olivine crystals, as well as accessory low-Ca pyroxenes up to ~ 50 um in diameter. The presence of small amounts of hydrous melt ensures that crystalline phases have maximal H_2O contents possible, while in equilibrium with the full peridotite assemblage (melt + ol + pyx +- gt).

机译：过渡区上方地幔中含水部分熔融的开始是由橄榄岩的H_2O储存能力决定的，橄榄石的H_2O储存能力定义为在不稳定含水流体或熔融物的情况下，固体组合物可以在P和T储存的最大浓度。在简单的系统中，矿物的H_2O储存能力不足以限制橄榄岩的储水能力，因为较简单的系统无法解决水合熔体稳定性的提高和由多重饱和橄榄岩的附加成分促进的H_2O活性降低的问题。在这项研究中，我们通过分层实验确定在10-13 GPa和1,350-1,450°C下橄榄石的饱和橄榄石和辉石的储水量，其中胶囊的底部〜2/3由水合KLB-1氧化物类似物组成橄榄石和胶囊的顶部〜1/3处几乎是水合的Mg＃89.6橄榄石的单神经元层。这种方法促进了〜200um橄榄石晶体以及直径高达〜50um的辅助低钙辉石的生长。少量含水熔体的存在确保了结晶相可能具有最大的H_2O含量，同时与整个橄榄岩组合体（熔体+ ol + pyx +>）保持平衡。

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《Contributions to Mineralogy and Petrology》 |2012年第2期|共20页
作者
T. J. Tenner; M. M. Hirschmann; A. C. Withers;
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正文语种 eng
中图分类矿物学;
关键词
Hydrous partial melting; Peridotite; 410-km discontinuity;

机译：含水部分熔融;橄榄岩;410 km间断;

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1. H_2O storage capacity of olivine and low-Ca pyroxene from 10 to 13 GPa: consequences for dehydration melting above the transition zone [J] . T. J. Tenner, M. M. Hirschmann, A. C. Withers Contributions to Mineralogy and Petrology . 2012,第2期

机译：橄榄石和低钙辉石在10 GPa至13 GPa的H_2O储存能力：过渡区上方脱水融化的后果
2. H₂O storage capacity of olivine and low-Ca pyroxene from 10 to 13 GPa: consequences for dehydration melting above the transition zone [J] . Travis J. Tenner, Marc M. Hirschmann, Anthony C. Withers, Contributions to Mineralogy and Petrology . 2012,第2期

机译：橄榄石和低钙辉石在10 GPa至13 GPa的H _{2 O储存能力：过渡带上方脱水融化的后果}
3. Erratum to: H₂O storage capacity of olivine and low-Ca pyroxene from 10 to 13 GPa: consequences for dehydration melting above the transition zone [J] . Travis J. Tenner, Marc M. Hirschmann, Anthony C. Withers, Contributions to Mineralogy and Petrology . 2012,第2期

机译：勘误：橄榄石和低钙辉石在10 GPa至13 GPa的H _{2 O储存能力：过渡带以上脱水融化的后果}
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6. Erratum to: H2O storage capacity of olivine and low-Ca pyroxene from 10 to 13 GPa: consequences for dehydration melting above the transition zone [O] . Travis J. Tenner, Marc M. Hirschmann, Anthony C. Withers, 2011

机译：错误至：Olivine的H2O储存能力和低Ca Pyroxene从10到13 GPA：脱水后果熔化在过渡区上方
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H_2O storage capacity of olivine and low-Ca pyroxene from 10 to 13 GPa: consequences for dehydration melting above the transition zone

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