DOI: 10.1002/2014GL061095
论文题名: Radon emanation from brittle fracturing in granites under upper crustal conditions
作者: Nicolas A. ; Girault F. ; Schubnel A. ; Pili E. ; Passelègue F. ; Fortin J. ; Deldicque D.
刊名: Geophysical Research Letters
ISSN: 0094-9867
EISSN: 1944-9598
出版年: 2014
卷: 41, 期: 15 起始页码: 5436
结束页码: 5443
语种: 英语
英文关键词: brittle damage and failure
; connectivity
; radon emanation
; thermal and mechanical fracturing
; transient signals
; triaxial stress
Scopus关键词: Failure (mechanical)
; Granite
; Mica
; Stresses
; Structural geology
; Brittle damage
; connectivity
; Mechanical fracturing
; Radon emanation
; Transient signal
; Tri-axial stress
; Differential stress
; Earthquake precursors
; Isolated micropores
; Mechanical damages
; Pore fluid pressure
; Pressure-temperature conditions
; Radon concentrations
; Radon
; brittle fracture
; concentration (composition)
; fluid pressure
; granite
; porous medium
; radon
; upper crust
英文摘要: Radon-222, a radioactive gas naturally produced in the Earth's crust, informs us about the migration of fluids and is sometimes considered as a potential earthquake precursor. Here we investigate the effects of mechanical and thermal damage on the radon emanation from various granites representative of the upper crust. Radon concentration measurements performed under triaxial stress and pore fluid pressure show that mechanical damage resulting from cycles of differential stress intensifies radon release up to 170±22% when the sample ruptures. This radon peak is transient and results from the connection of isolated micropores to the permeable network rather than new crack surface creation per se. Heating to 850°C shows that thermal fracturing irreversibly decreases emanation by 59-97% due to the amorphization of biotites hosting radon sources. This study, and the developed protocols, shed light on the relation between radon emanation of crustal rocks, deformation, and pressure-temperature conditions. Key Points Mechanical and thermal damage effects on radon release are studied in granites Measurements of radon concentration in pores are coupled with a triaxial cell Mechanical damage connects isolated pores leading to transient radon signals © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84905325851&doi=10.1002%2f2014GL061095&partnerID=40&md5=e3dae7f0fc3c43ea9e20cbe5859fbf4a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7131
Appears in Collections: 气候减缓与适应
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作者单位: Laboratoire de Géologie, École Normale Supérieure, CNRS UMR 8538, Paris, France
Recommended Citation:
Nicolas A.,Girault F.,Schubnel A.,et al. Radon emanation from brittle fracturing in granites under upper crustal conditions[J]. Geophysical Research Letters,2014-01-01,41(15).