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arXiv 2209.09783physics.geo-phcond-mat.mtrl-sciphysics.comp-ph
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俯冲带条件下利蛇纹石的弹性各向异性

Elastic anisotropy of lizardite at subduction zone conditions

Xin Deng, Chenxing Luo, Renata M. Wentzcovitch, Geoffrey A. Abers, Zhongqing Wu

摘要:

俯冲带通过板块俯冲将水输送到地球内部深处。绢云母矿物是超镁铁橄榄岩的主要水化产物,在大多数俯冲带中都很丰富。它们的高温弹性特征,特别是它们的各向异性,将有助于我们更好地估计地幔蛇纹化和地球深部水循环的程度。蛇纹石的低温多晶型物利蛇纹石在冷俯冲板块的P-T条件下(<260 ° C,2GPa)是稳定的,其高温弹性仍然未知。本文报道了利蛇纹石在俯冲带P-T条件下的从头算弹性和声波速度。我们的静态结果与以前的研究一致。它的高温速度远高于以前的实验为基础的利蛇纹石估计与温石棉,但更接近叶蛇纹石的速度。利蛇纹石的弹性各向异性比叶蛇纹石大得多,可以更好地解释在汤加等一些冷板中观察到的大剪切波分裂。

英文摘要:

Subduction zones transport water into Earth's deep interior through slab subduction. Serpentine minerals, the primary hydration product of ultramafic peridotite, are abundant in most subduction zones. Characterization of their high-temperature elasticity, particularly their anisotropy, will help us better estimate the extent of mantle serpentinization and the Earth's deep water cycle. Lizardite, the low-temperature polymorph of serpentine, is stable under the P-T conditions of cold subduction slabs (< 260°C at 2 GPa), and its high-temperature elasticity remains unknown. Here we report ab initio elasticity and acoustic wave velocities of lizardite at P-T conditions of subduction zones. Our static results agree with previous studies. Its high-temperature velocities are much higher than previous experimental-based lizardite estimates with chrysotile but closer to antigorite velocities. The elastic anisotropy of lizardite is much larger than that of antigorite and could better account for the observed large shear-wave splitting in some cold slabs such as Tonga.

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