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《Journal of University of Chinese Academy of Sciences》 2016-06
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Numerical thermal modeling of the magmatism at ultraslow spreading zone of hydrothermal area A of Southwest Indian Ridge (SWIR)

BIAN Long;ZHANG Jian;RUAN Aiguo;Key Laboratory of Computational Geodynamics,Chinese Academy of Sciences;College of Earth Science,University of Chinese Academy of Sciences;Second Institute of Oceanography,State Oceanic Administration;Key Laboratory of Submarine Geosciences,State Oceanic Administration;  
The Chinese DY115-21 cruse acquired valuable OBS seismic data at hydrothermal area A of SWIR and discovered a low-velocity zone which located on the 27 th segment of SWIR. Based on velocity section of P wave,we use the finite element method to model the heating process,aiming to discover the possible magmatism and heat effect of the low-velocity zone. The results are given as follows. 1) The current seafloor hydrothermal activity indicates the existence of bottom heating power in the magma chamber. Hotspot causes thermal abnormality in the process of magma moving along the fracture and creates a new magma chamber to provide heat resource for current hydrothermal activities. 2) Temperature-dependent thermal conductivity greatly influenced the results of the thermal modeling. The modeling results show that the moho temperature of the research area is about910 ℃ and the heat flux at the hotspot is about 190 mW ·m~(- 2).
【Fund】: 国家自然科学基金(41574074 41430319 41174085);; 中国科学院战略先导项目(XDA1103010102);中国科学院创新团队项目(KZZDEW-TZ-19)资助
【CateGory Index】: P736
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