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

Temperature dependence of [100](010) and [001](010) dislocation mobility in natural olivine
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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
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发表时间:
2016
影响因子:
5.3
通讯作者:
T. Katsura
T. Katsura
中科院分区:
地球科学1区
文献类型:
--
作者:
S. Blaha;Z. Pintér;R. Farla;T. Kawazoe;N. Miyajima;K. Michibayashi;T. Katsura

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在1450 ~ 1760 K、室温压力和Ni-NiO缓冲层附近的氧分压下对预变形的橄榄石单晶进行了位错恢复实验,以确定[100]和[001]位错在(010)面上的湮灭速率。橄榄石单晶首先变形,以激活所需的滑移系统下简单的剪切几何形状,然后在目标条件下退火。变形产生了伯格斯矢量B分别为[100]和[001]的刃型和螺型位错,它们都沿[001]方向伸长。两种位错的位错湮灭速率常数在0.3log单位内相同。两种位错的激活能也是相同的,即,400 kJ/mol,这也与Si自扩散系数相同。这种对应关系表明,在低应力和高温条件下,橄榄石位错蠕变受扩散控制过程控制。这项研究提供了一个潜在的洞察形成的AG型结构的橄榄石。
Dislocation recovery experiments were conducted on pre-deformed olivine single crystals at 1450 to 1760 K, room pressure, and oxygen partial pressures near the Ni–NiO buffer to determine the annihilation rates for [100] and [001] dislocations on the (010) plane. Olivine single crystals were first deformed to activate the desired slip systems under simple shear geometry and then annealed at target conditions. The edge and screw dislocations with Burgers vectors,b, of [100] and [001], respectively, both elongated in the [001] direction were produced by the deformation. The dislocation annihilation rate constants of both types of dislocations are identical within 0.3 log unit. The activation energies for both dislocations are also identical, i.e., ∼400 kJ/mol, which is also identical to that of the Si self-diffusion coefficient. This correspondence suggests that olivine dislocation creep controlled by a diffusion-controlled process under low-stress and high-temperature conditions. This study offers a potential insight into the formation of AG-type fabric in olivine.
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