西南日本におけるスラブ起源深部流体の分布と特徴;西南日本におけるスラブ起源深部流体の分布と特徴;Spatial distribution and feature of slab-related deep-seated fluid in SW Japan
西南日本におけるスラブ起源深部流体の分布と特徴;西南日本におけるスラブ起源深部流体の分布と特徴;Spatial distribution and feature of slab-related deep-seated fluid in SW Japan
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日本西南部板片相关深层流体空间分布及特征;日本西南部板片相关深层流体空间分布及特征
DOI：
10.4145/jahs.44.3
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发表时间：
2014
影响因子：
1.5
通讯作者：
Tsukasa Kirita
中科院分区：
文献类型：
--
作者：
Kohei Kazahaya;Masaaki Takahashi;M. Yasuhara;Yoshiro Nishio;Akihiko Inamura;Noritoshi Morikawa;Tsutomu Sato;Hiroshi A. Takahashi;Koichi Kitaoka;Shinji Ohsawa;Yoichi Oyama;Michiko Ohwada;Hitoshi Tsukamoto;Keika Horiguchi;Yuki Tosaki;Tsukasa Kirita
近10年来，以日本Hi-net（日本高灵敏度地震仪网络）为主的地震监测揭示了由于日本弧俯冲带深部流体的不均匀存在和与流体有关的深低频地震所引起的地壳和地幔速度异常的三维结构。岩石学水循环模型与地球物理俯冲模型相结合，定量地显示了固体地球中的水收支。最近的发现推断了深部热液流体对内陆地震发生的重要性。由于模型是根据监测、实验技术或模拟获得的结果建立的，因此，基于证据的地球化学和地质研究的意义有望用于证明水循环模型。因此，我们研究了日本西南部弧深层地下水的化学特征，并显示了与地下水混合的深层流体的空间分布。结果表明，深部流体具有高Li/Cl比值（>0.001 wt. %），其同位素组成与岩浆相似。Li/Cl比值），并认为Li/Cl是探测地下水中与板片有关的深部流体的良好指标。Li/Cl的空间分布表明，板片相关的深部流体沿沿着断层和构造线上涌，并在靠近第四纪火山在日本西南弧。在大多数情况下，在发生深低频地震的地区附近发现了上升流，这意味着深部流体导致了深低频地震。
Recent seismic monitoring mainly by the Hi-net (High sensitivity seismograph network in Japan) for the last decade has been revealing the 3D structure of velocity anomaly in the crust and mantle due to heterogeneous presence of deep-seated fluids and fluid-related deep low frequency earthquakes in subduction zones of Japan arc. Petrological water circulation models combined with geophysical subduction models quantitatively show the water budget in the solid earth. The recent findings infer the importance of deep hydrothermal fluid on the occurrence of inland earthquakes. As the models are built with the result obtained by monitoring, experimental techniques or simulations, implications from evidence-based geochemical and geological studies are expected for the proof of water circulation models. Hence, we examined chemical features of deep groundwaters in SW Japan arc, and showed spatial distribution of deep-seated fluid mixed into groundwater. We found that the deep-seated fluid, whose isotopic composition is similar to magmatic, has the high Li/Cl ratio (>0.001 in wt. ratio),and concluded that Li/Cl is a good indicator for detecting the slab-related deep-seated fluid in groundwaters. Spatial distribution of Li/Cl reveals that slab-related deep-seated fluid upwells along the faults and tectonic lines, and at close to Quaternary volcanoes in SW Japan arc. In most cases, upwelling places are found close to the areas where deep low frequency (DLF) earthquakes are occurring, implying that deep-seated fluid causes DLF events.
影响因子：
64.8
作者：
Shelly, David R.;Beroza, Gregory C.;Nakamula, Sho
通讯作者：
Nakamula, Sho
影响因子：
56.9
作者：
Obara, K
通讯作者：
Obara, K