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Tao, Chunhui; Seyfried, Jr, W E; Lowell, R P; Liu, Yunlong; Liang, Jin; Guo, Zhikui; Ding, Kang; Zhang, Huatian; Liu, Jia; Qiu, Lei; Egorov, Igor; Liao, Shili; Zhao, Minghui; Zhou, Jianping; Deng, Xianming; Li, Huaiming; Wang, Hanchuang; Cai, Wei; Zhang, Guoyin; Zhou, Hongwei; Lin, Jian; Li, Wei
Nature communications, 03/2020, Letnik: 11, Številka: 1Journal Article
Coupled magmatic and tectonic activity plays an important role in high-temperature hydrothermal circulation at mid-ocean ridges. The circulation patterns for such systems have been elucidated by microearthquakes and geochemical data over a broad spectrum of spreading rates, but such data have not been generally available for ultra-slow spreading ridges. Here we report new geophysical and fluid geochemical data for high-temperature active hydrothermal venting at Dragon Horn area (49.7°E) on the Southwest Indian Ridge. Twin detachment faults penetrating to the depth of 13 ± 2 km below the seafloor were identified based on the microearthquakes. The geochemical composition of the hydrothermal fluids suggests a long reaction path involving both mafic and ultramafic lithologies. Combined with numerical simulations, our results demonstrate that these hydrothermal fluids could circulate ~ 6 km deeper than the Moho boundary and to much greater depths than those at Trans-Atlantic Geotraverse and Logachev-1 hydrothermal fields on the Mid-Atlantic Ridge.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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