Reaction infiltration instability (RII) can cause the formation of melt channels and potentially facilitate the physical transport of sulfide liquid, which contributes to the geochemical evolution of chalcophile elements in the lithospheric mantle. This study conducted some two-layer reaction experiments to explore the feasibility of reaction-driven sulfide migration along high-velocity silicate-melt channels. With increasing duration, the formation of more silicate-melt channels and the transport of more sulfide droplets into a depleted peridotite were observed due to the increase of the local permeability. However, at a longer duration, the presence of some melt-channel relics implies that melt channels are temporary and ultimately closed when the reaction infiltration of silicate melt reached equilibrium in the depleted peridotite. Furthermore, theoretical calculations indicate that the RII of the system is suppressed, which impedes the formation of melt channels. The homogeneous distribution of silicate melt in a sulfide-free experiment implies that the Zener pinning of sulfide probably enhances the RII, thereby facilitating the formation of temporary melt channels. Therefore, this study demonstrates that sufficient silicate melt disequilibrium with solid phases in a liquid source potentially promotes the mechanical extraction of sulfides during reaction infiltration of silicate melt.

中文翻译：

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橄榄石部分熔融过程中的反应渗透不稳定性及其对硫化物液体运输的影响

反应渗透不稳定性（RII）可能导致形成熔体通道，并可能促进硫化物液体的物理运输，这有助于岩石圈地幔中嗜硫元素的地球化学演化。这项研究进行了一些两层反应实验，以探索反应驱动的硫化物沿高速硅酸盐熔体通道迁移的可行性。随着持续时间的增加，由于局部渗透率的增加，观察到更多的硅酸盐熔体通道的形成和更多的硫化物液滴向贫化橄榄岩的迁移。但是，在较长的时间里，一些熔融通道遗迹的存在意味着熔融通道是暂时的，并在贫化橄榄岩中硅酸盐熔融物的反应渗透达到平衡时最终封闭。此外，理论计算表明，系统的RII受到抑制，这阻碍了熔体通道的形成。在无硫化物的实验中，硅酸盐熔体的均匀分布意味着硫化物的齐纳钉扎可能会增强RII，从而促进临时熔体通道的形成。因此，这项研究表明，在液体源中具有足够固相的硅酸盐熔体不平衡可能会促进硅酸盐熔体反应渗透过程中硫化物的机械萃取。从而有利于临时熔体通道的形成。因此，这项研究表明，在液体源中具有足够固相的硅酸盐熔体不平衡可能会促进硅酸盐熔体反应渗透过程中硫化物的机械萃取。从而有利于临时熔体通道的形成。因此，这项研究表明，在液体源中具有足够固相的硅酸盐熔体不平衡可能会促进硅酸盐熔体反应渗透过程中硫化物的机械萃取。