气候变化领域集成服务门户(CCPortal): Integrated magnetotelluric and petrological analysis of felsic magma reservoirs: Insights from Ethiopian rift volcanoes

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DOI	10.1016/j.epsl.2021.116765
	Integrated magnetotelluric and petrological analysis of felsic magma reservoirs: Insights from Ethiopian rift volcanoes
	Samrock F.; Grayver A.V.; Bachmann O.; Karakas Ö.; Saar M.O.
发表日期	2021
ISSN	0012821X
卷号	559
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)
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203281
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
推荐引用方式 GB/T 7714	Samrock F.,Grayver A.V.,Bachmann O.,et al. Integrated magnetotelluric and petrological analysis of felsic magma reservoirs: Insights from Ethiopian rift volcanoes[J],2021,559.
APA	Samrock F.,Grayver A.V.,Bachmann O.,Karakas Ö.,&Saar M.O..(2021).Integrated magnetotelluric and petrological analysis of felsic magma reservoirs: Insights from Ethiopian rift volcanoes.Earth and Planetary Science Letters,559.
MLA	Samrock F.,et al."Integrated magnetotelluric and petrological analysis of felsic magma reservoirs: Insights from Ethiopian rift volcanoes".Earth and Planetary Science Letters 559(2021).