We have systematically investigated the high-pressure and high-temperature stability of Al-bearing dense hydrous magnesium silicate phases (DHMSs) in natural chlorite compositions containing ~ 16 wt% H₂O and ~ 14 wt% Al₂O₃ between 14 and 25 GPa at 800–1600 °C by an MA8-type multi-anvil apparatus. A chemical mixture similar to Fe-free chlorite was also investigated for comparison. Following the pressure–temperature (P–T) path of cold subduction, the phase assemblage of phase E + phase D is stable at 14–25 GPa. Superhydrous phase B is observed between 16 and 22 GPa coexisting with phase E + phase D. Following the P–T path of hot subduction, the phase assemblage of phase E + garnet is identified at 14–18 GPa coexisting with the melt. The phase assemblage of superhydrous phase B + phase D was found at 18–25 GPa, which is expected to survive at higher P–T conditions. We have confirmed that the presence of Al could enhance the stability of DHMSs. Our results indicate that, after chlorite decomposition at the shallow region of the subduction zone, the wide stability field of Al-bearing DHMSs can increase the possibility of water transportation into the deep lower mantle.

我们系统地研究了含铝的致密水合硅酸镁相 (DHMS) 在含有 ~ 16 wt% H ₂ O 和 ~ 14 wt% Al ₂ O _{3 的}天然绿泥石组合物中的高压和高温稳定性使用 MA8 型多砧装置在 800–1600 °C 下在 14 到 25 GPa 之间。还研究了类似于无铁亚氯酸盐的化学混合物以进行比较。沿着冷俯冲的压力-温度（P-T）路径，E相+D相的相组合稳定在14-25 GPa。在 16 到 22 GPa 之间观察到超水相 B 与 E + 相 D 共存。沿着热俯冲的 P-T 路径，在 14-18 GPa 处发现 E + 石榴石的相组合与熔体共存。超水相 B + 相 D 的相组合在 18-25 GPa 下被发现，预计在更高的 P-T 条件下可以存活。我们已经证实铝的存在可以提高 DHMS 的稳定性。我们的结果表明，在俯冲带浅层绿泥石分解后，