Timescales of Magma Mixing Beneath the Iheya Ridge, Okinawa Trough: Implications for the Stability of Sub-Seafloor Magmatic Systems

Submarine volcanic eruptions can be destructive for marine environments and resources. Magma mixing is considered to an important trigger eruptions. Determining the magma residence time from eruption conducive assessing stability of magmatic systems, especially beneath seafloor where in situ volcano monitoring inaccessible. Here, we estimated timescale Iheya Ridge, Okinawa Trough, which characterized by pervasive mixing. We focused on andesitic rhyolitic generated basalt–rhyolite rhyolite–rhyolite mixing, respectively. By taking advantage Mg diffusion chronometry, showed that resided chamber very short (~0.1–0.3 years), whereas was much longer (~80–120 years). The different times might part related rheology mixed magmas. suggested efficient allowed andesites erupted, may explain appearance scarce dominant settings. However, rapid a disadvantage development preservation hydrothermal Therefore, suggest sub-seafloor systems must evaluated during assessment sulfide resources mining prospects.