[S-CG40] Science of slow-to-fast earthquakes

[SCG40-27] Duplex Underplating, Sediment Dehydration and Quartz Vein Mineralization in the Deep Tremor Source Region

*氏家 恒太郎¹、西山 直毅²、山本 久暉¹、山下 穂¹、永冶 方敬³、佐野 貴司⁴、纐纈 佑衣⁵ (1.筑波大学、2.産業技術研究所、3.東京学芸大学、4.国立科学博物館、5.名古屋大学)

キーワード：微動、石英脈、堆積物脱水、デュープレックス底付付加

Deep tectonic tremor downdip of the seismogenic zone in warm subduction zones is thought to occur in the region of high fluid pressures. However, the deformation and fluid processes responsible for tremor are poorly understood. We examined the Tomuru metamorphic rocks on Ishigaki Island, southern Ryukyu Arc, deformed at ~40 km depth and ~450 °C under epidote-blueschist metamorphism comparable to the tremor source region in northern Cascadia subduction zone. Here, quartz vein-rich metapelite and metabasite are repeated many times as a result of duplex underplating. The spatiotemporal relationship between clustered quartz veins and the juxtaposition of metapelite and metabasite suggests that quartz vein formation and duplex underplating are contemporaneous. Viscous shear in metapelite is accommodated by dissolution-precipitation creep. Metabasite records heterogeneous dehydration, resulting in rheological heterogeneity characterized by greenschist lenses in the foliated blueschist matrix. Viscous shear in the blueschist matrix was mainly accommodated by dissolution-precipitation creep of glaucophane. Geochemical and strontium-neodymium isotope analyses indicated that quartz veins were derived from sediment dehydration, whereas dehydration from oceanic crust contributed neither to quartz vein formation nor to fluid overpressures. We suggest that high fluid pressure in the deep tremor source region is primarily controlled by dehydration of subducting sediments, and the clustered quartz veins in underplated rocks correlate with the overpressured tremor source in low shear-wave velocity zones.