气候变化领域集成服务门户(CCPortal): Rapid transcrustal magma movement under Iceland

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DOI	10.1038/s41561-019-0376-9
	Rapid transcrustal magma movement under Iceland
	Mutch E.J.F.; Maclennan J.; Shorttle O.; Edmonds M.; Rudge J.F.
发表日期	2019
ISSN	17520894
卷号	12 期号:7
英文摘要	Magma supply from the lower crust is often proposed as a trigger mechanism for volcanic eruptions. The timescales over which magma can be transported from the deepest parts of volcanic systems are, however, poorly constrained. This uncertainty poses problems for the construction of physical models and for assessment of volcanic hazards. Here, we combined geothermobarometry with Bayesian inversion diffusion chronometry on primitive olivine crystals from the Borgarhraun eruption, northern Iceland. We find that magma took about 10 days to ascend from near-Moho storage at 24 km depth before its eruption, and therefore present timescales for transcrustal magma transport on the global spreading ridge system. Our results reveal a rapid connection between the lower and upper crust with melt transport rates of 0.02 to 0.1 m s−1, which are consistent with the propagation rates observed in seismic swarms in the Icelandic lower crust. Monitoring of such events using surface CO2 fluxes may provide one of the earliest indicators that an eruption is imminent. At the high transport rates and low CO2 contents estimated for the Borgarhraun eruption, any effect of rising magma on surface CO2 fluxes is limited to a period of less than two days before eruption. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	carbon dioxide; carbon flux; lower crust; magma; trigger mechanism; upper crust; volcanic eruption; Iceland
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124644
作者单位	Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom; Institute of Astronomy, University of Cambridge, Cambridge, United Kingdom; Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Mutch E.J.F.,Maclennan J.,Shorttle O.,et al. Rapid transcrustal magma movement under Iceland[J],2019,12(7).
APA	Mutch E.J.F.,Maclennan J.,Shorttle O.,Edmonds M.,&Rudge J.F..(2019).Rapid transcrustal magma movement under Iceland.Nature Geoscience,12(7).
MLA	Mutch E.J.F.,et al."Rapid transcrustal magma movement under Iceland".Nature Geoscience 12.7(2019).