Journal of Japanese Association of Hydrological Sciences
Online ISSN : 1883-7166
Print ISSN : 1342-9612
GENERAL ARTICLE
Geofluid research using lithium isotopic tool advances understanding of whole crustal activity
Yoshiro NISHIO
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2013 Volume 43 Issue 4 Pages 119-135

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Abstract

Deep-rooted fluids play important role in generating earthquakes and/or volcanic eruption, whereas it was difficult to research deep-rooted fluids from groundwater samples using traditional geochemical tools owing to contamination from surface water. The Li isotopic index, a new geofluid research tool, has a potential to provide us information about deep-rooted fluid without contamination from surface water. Based on the Li isotopic data of groundwater samples, it has been revealed that geofluid involving the earthquake swarms beneath the southeast flank of Ontake volcano in central Japan is attributed to non-volcanic deep-rooted fluid. Furthermore, this paper argues the relationship between inland large earthquakes and the discontinuous deep-seated fluid upwelling that is induced by the periodic breaking of the low-permeable barrier (cap) on the deep-seated fluid reservoir. The Li isotopic tool has a potential to provide us new information about the discontinuous deep-seated fluid upwelling.

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© 2013 Journal of Japanese Association of Hydrological Sciences
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