Dehydration and fluid circulation are integral parts of subduction tectonics that govern the dynamics of the wedge mantle. The knowledge of the elastic behavior of aqueous fluid is crucial to understand the fluid–rock interactions in the mantle through velocity profiles. In this study, we investigated the elastic wave velocities of chlorite at high pressure beyond its dehydrating temperature, simulating the progressive dehydration of hydrous minerals in subduction zones. The dehydration resulted in an 8% increase in compressional (Vp) and a 5% decrease in shear wave (Vs) velocities at 950 K. The increase in Vp can be attributed to the stiffening of the sample due to the formation of secondary mineral phases followed by the dehydration of chlorite. The fluid-bearing samples exhibited Vp/Vs of 2.45 at 950 K. These seismic parameters are notably different from the major mantle minerals or hydrous silicate melts and provide unique seismic criteria for detecting mantle fluids through seismic tomography.

中文翻译：

---

俯冲带中亚氯酸盐脱水过程中释放出的含水流体的异常地震行为

脱水和流体循环是俯冲构造中不可或缺的部分，它们控制着楔形地幔的动力学。含水流体的弹性行为的知识对于通过速度分布图了解地幔中的流体-岩石相互作用至关重要。在这项研究中，我们研究了亚氯酸盐在超出其脱水温度的高压下的弹性波速度，模拟了俯冲带中含水矿物的逐步脱水。脱水导致950 K下的压缩（Vp）速度增加8％，剪切波（Vs）速度减少5％。Vp的增加可归因于二次矿物相的形成而使样品变硬其次是亚氯酸盐的脱水。含流体的样品在950 K下的Vp / Vs为2.45。