globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116765
论文题名:
Integrated magnetotelluric and petrological analysis of felsic magma reservoirs: Insights from Ethiopian rift volcanoes
作者: Samrock F.; Grayver A.V.; Bachmann O.; Karakas Ö.; Saar M.O.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 559
语种: 英语
中文关键词: geochemistry ; magmatic volatiles ; magnetotelluric imaging ; melt evolution ; petrology ; volcano monitoring
英文关键词: Electric conductivity ; Geothermal energy ; Geothermal power plants ; Magnetotellurics ; Numerical methods ; Petrology ; Phase equilibria ; Structural geology ; Volcanoes ; Electrical conductivity ; Laboratory analysis ; Laboratory measurements ; Long-term potential ; Magma plumbing system ; Magnetotelluric studies ; Petrological analysis ; Thermodynamic modelling ; Gasoline ; electrical conductivity ; felsic rock ; integrated approach ; magma chamber ; magnetotelluric method ; monitoring ; numerical method ; petrology ; structural geology ; thermochemistry ; three-dimensional modeling ; volcanology ; East African Rift ; Ethiopian Rift
英文摘要: Geophysical and petrological probes are key to understanding the structure and the thermochemical state of active magmatic systems. Recent advances in laboratory analyses, field investigations and numerical methods have allowed increasingly complex data-constraint models with new insights into magma plumbing systems and melt evolution. However, there is still a need for methods to quantitatively link geophysical and petrological observables for a more consistent description of magmatic processes at both micro- and macro-scales. Whilst modern geophysical studies provide detailed 3-D subsurface images that help to characterize magma reservoirs by relating state variables with physical material properties, constraints from on-site petrological analyses and thermodynamic modelling of melt evolution are at best incorporated qualitatively. Here, we combine modelling of phase equilibria in cooling magma and laboratory measurements of electrical properties of melt to derive the evolution of electrical conductivity in a crystallizing silicic magmatic system. We apply this framework to 3-D electrical conductivity images from magnetotelluric studies of two volcanoes in the Ethiopian Rift. The presented approach enables us to constrain key variables such as melt content, temperature and magmatic volatile abundance at depth. Our study shows that accounting for magmatic volatiles as an independent phase is crucial for understanding electrical conductivity structures in magma reservoirs at an advanced state of crystallization. Furthermore, our results deepen the understanding of the mechanisms behind volcanic unrest and help assess the long-term potential of hydrothermal reservoirs for geothermal energy production. © 2021 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165659
Appears in Collections:气候变化与战略

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作者单位: ETH Zurich, Department of Earth Sciences, Institute of Geophysics, Geothermal Energy and Geofluids group, Zurich, Switzerland; ETH Zurich, Department of Earth Sciences, Institute of Geophysics, Earth and Planetary Magnetism group, Zurich, Switzerland; ETH Zurich, Department of Earth Sciences, Institute of Geochemistry and Petrology, Magmatic Petrology and Volcanology group, Zurich, Switzerland; University of Minnesota, Department of Earth and Environmental Sciences, Minneapolis, United States

Recommended Citation:
Samrock F.,Grayver A.V.,Bachmann O.,et al. Integrated magnetotelluric and petrological analysis of felsic magma reservoirs: Insights from Ethiopian rift volcanoes[J]. Earth and Planetary Science Letters,2021-01-01,559
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