Enhancement of ductile deformation in polycrystalline anorthite due to the addition of water
Enhancement of ductile deformation in polycrystalline anorthite due to the addition of water
复制标题
加水增强了多晶钙长石的延性变形
DOI：
10.1016/j.jsg.2022.104547
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发表时间：
2022
影响因子：
3.1
通讯作者：
Hiroyuki Nagahama
中科院分区：
文献类型：
--
作者：
Jun-ichi Fukuda;Jun Muto;Sanae Koizumi;Sando Sawa;Hiroyuki Nagahama
我们进行了剪切变形实验人工钙长石（An）集料与外部添加不同数量的水。样品是纯An聚集体和具有5%富含Si-Al的玻璃的An聚集体（下文中为An +玻璃），每种具有至多0.5wt%的添加水。实验是在900 °C和1.0 GPa下使用格里格型变形装置进行的，剪切应变速率范围为10− 3.5至10−5.0s−1。我们观察到，随着添加水量的增加，有效粘度明显降低了两个数量级。显微组织观察表明，随着加水量的增加，变形行为由脆性向韧性演化。具有0.5重量%添加水的纯An样品比等效An +玻璃样品强一个数量级以上。红外光谱测量结果表明，被困在An +玻璃和纯An样品中的水含量分别增加到1710和840 ppm H2O，在0.5重量%的添加水的实验。两个样品的水含量的差异表明大约一半的水含量被截留在玻璃中。
We performed shear deformation experiments on synthetic anorthite (An) aggregates with various amounts of water added externally. The samples were pure An aggregates and aggregates of An with 5% Si–Al-rich glass (An + glass hereafter), each with up to 0.5 wt% added water. The experiments were conducted using a Griggs-type deformation apparatus at 900 °C and 1.0 GPa, with shear strain rates ranging from 10−3.5to 10−5.0s−1. We observed a clear reduction of up to two orders of magnitude in effective viscosity with an increase in the amount of added water. Microstructural observations indicate that the deformation behavior evolves from brittle to ductile with an increasing amount of added water. The pure An sample with 0.5 wt% added water is more than an order of magnitude stronger than the equivalent An + glass sample. Infrared spectroscopy measurements reveal that the water contents trapped in the An + glass and pure An samples increase up to 1710 and 840 ppm H2O, respectively, during the 0.5 wt% added-water experiments. The difference in the water contents of the two samples indicates that approximately half of the water content is trapped in glass.
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发表时间：
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