Dislocation recovery experiment of hydrous olivine as a function of water content and crystallographic orientation

水合橄榄石的位错恢复实验作为含水量和晶体取向的函数

• 批准号: 229061489
• 负责人: Professor Dr. Tomoo Katsura
• 金额: --
• 依托单位: Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik (BGI)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/229061489?language=en
• 关键词: Dislocation; recovery; experiment; hydrous; olivine

Deformation experiments suggested that dislocation mobility should be enhanced by water incorporation, and the water-content dependence of dislocation mobility in the [100](010) (Type-A), [100](001) (Type-E) and [001](100) (Type-C)slips should be higher in this order. The overall water-content exponent of dislocation mobility should be 1.2. In order to examine these results, the applicant conducted dislocation recovery experiment in the preceding project and obtained the following results. (1) In spite of at least four reported fabric types (Type A, B, C and E), there are only two kinds of dislocations. Dislocations for Type A and E fabrics are edge dislocations with a [100] Burgers vector (a-dislocations), whereas those for Type B and C fabrics are screw dislocations with a [001] Burgers vector (c-dislocations).(2) The activation energies and volumes of annihilation-rate constants of a- and c-dislocations are identical, and are also comparable with those of the Si diffusions. These facts suggest that motions of these two dislocations are diffusion-controlled. (3) The water-content exponents of annihilation-rate constants of a- and c-dislocations are 0.2±0.4 and -0.5±0.2, respectively. Namely, their water content dependences are zero with in uncertainty and negative, respectively.Although these striking results were thus obtained, there are insufficient Points.(1) Uncertainties of the annihilation-rate constants of a-dislocations by the [100](010) slip are very large.(2) Data points of the annihilation-rate constants of c-dislocations by the [001](010) slip are too few.(3) It is not clear whether dislocations accounting for Type-E fabric are really absent under any condition.(4) It is not clear whether c-dislocations responsible for Type-B and Type-C fabrics are identical or not. For these reasons, the following experiments will be conducted in this project.(1) Data points of water-content dependence of annihilation-rate constants of a-dislocations will be reinvestigated by means of more precise techniques.(2) More data points will be produced for water-content dependence of annihilation-rate constants of c-dislocations.(3) Olivine single crystals will be sheared in the [100] direction on the (001) plane under various pressure, temperature, strain-rate and water-content conditions to examine their dislocation textures.(4) Pressure and temperature dependence of c-dislocations by the [001](100) slip and water-content dependence of those by the [001](010) slip will be obtained.

变形实验表明，水工业应增强位错迁移率，以及在[100]（010）（type-a），[100]（001）（type-e）（type-e）和[001]（100）（100）（type-c）（type-c）（type-c）（type-c）（type-c）中的水位依赖性依赖性应在此顺序上更高。位错迁移率的总体水含量指数应为1.2。为了检查这些结果，该应用在上述项目中进行了脱位恢复实验，并获得了以下结果。 （1）尽管至少有四种织物类型（A型，B，C和E），但只有两种位错。 Dislocations for Type A and E fabrics are edge dislocations with a [100] Burgers vector (a-dislocations), whereas those for Type B and C fabrics are screw dislocations with a [001] Burgers vector (c-dislocations).(2) The activation energies and volumes of annihilation-rate constants of a- and c-dislocations are identical, and are also comparable with those of the Si扩散。这些事实表明，这两个位错的运动是扩散控制的。 （3）A-和C-伸缩的an灭速率常数的水含量指数分别为0.2±0.4和-0.5±0.2。也就是说，它们的水含量依赖性分别为不确定性和负面。尽管获得了这些惊人的结果，但没有足够的点。（1）[100]（010）滑移的不确定性不确定性的A-A-dislations的不确定性很大。很少。（3）尚不清楚在任何情况下是否真的不存在考虑类型织物的位错。（4）尚不清楚负责B型B和Type-C织物是否相同的C-脱位。由于这些原因，该项目将在此项目中进行以下实验。（1）通过更精确的技术来重新投资A范围的水含量依赖性的数据点。（2）将产生更多的数据点，以使c-DiSloctation的c-DiSlants的水位依赖性依赖于C-DISSERTIANT。 （001）平面在各种压力，温度，应变率和水含水条件下检查其脱位纹理。（4）将获得[001]（100）[001]（100）[001]（010）对c-脱位的压力和温度依赖性。

项目成果

Temperature dependence of [100](010) and [001](010) dislocation mobility in natural olivine

天然橄榄石中[100](010)和[001](010)位错迁移率的温度依赖性

• DOI: 10.1016/j.epsl.2016.02.029
• 发表时间: 2016
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: S. Blaha;Z. Pintér;R. Farla;T. Kawazoe;N. Miyajima;K. Michibayashi;T. Katsura
• 通讯作者: T. Katsura