| DOI: | 10.1002/2013GL058105
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| 论文题名: | Volcanic sintering: Timescales of viscous densification and strength recovery |
| 作者: | Vasseur J.; Wadsworth F.B.; Lavallée Y.; Hess K.-U.; Dingwell D.B.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8398
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| EISSN: | 1944-8129
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| 出版年: | 2013
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| 卷: | 40, 期:21 | | 起始页码: | 5658
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| 结束页码: | 5664
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| 语种: | 英语
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| 英文关键词: | brittle
; pore-emanated crack model
; porosity
; tuffisite
; ultrasonic velocity
; volcanic ash
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| Scopus关键词: | brittle
; Crack model
; Micro-mechanical modeling
; National Institute of Standards and Technology
; Temperature dependent
; tuffisite
; Uniaxial compressive tests
; Volcanic ash
; Antigen-antibody reactions
; Cracks
; Densification
; Porosity
; Recovery
; Ultrasonic velocity
; Viscosity
; Volcanoes
; Sintering
; brittle deformation
; nonlinearity
; numerical model
; porosity
; temperature effect
; timescale
; viscosity
; volcanic ash
; volcanic eruption
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| 英文摘要: | Sintering and densification are ubiquitous processes influencing the emplacement of both effusive and explosive products of volcanic eruptions. Here we sinter ash-size fragments of a synthetic National Institute of Standards and Technology viscosity standard glass at temperatures at which the resultant melt has a viscosity of ∼108-109 Pa.s at 1bar to assess sintering dynamics under near-surface volcanic conditions. We track the strength recovery via uniaxial compressive tests. We observe that volcanic ash sintering is dominantly time dependent, temperature dependent, and grain size dependent and may thus be interpreted to be controlled by melt viscosity and surface tension. Sintering evolves from particle agglutination to viscous pore collapse and is accompanied by a reduction in connected porosity and an increase in isolated pores. Sintering and densification result in a nonlinear increase in strength. Micromechanical modeling shows that the pore-emanated crack model explains the strength of porous lava as a function of pore fraction and size. Key Points Viscous sintering is viscosity and grain-size limited Connected porosity can be closed over short timescales at volcanic conditions Melt strength is rapidly recovered to that of a defect-free melt ©2013 The Authors. Geophysical Research Letters published by Wiley on behalf of the American Geophysical Union. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84887513109&doi=10.1002%2f2013GL058105&partnerID=40&md5=91de3166c9de80679ba78b68445f7ecb
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/5662
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Earth and Environmental Sciences, Ludwig Maximilians University, Theresienstr. 41/III, 80333 Munich, Germany
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| Recommended Citation: | |
Vasseur J.,Wadsworth F.B.,Lavallée Y.,et al. Volcanic sintering: Timescales of viscous densification and strength recovery[J]. Geophysical Research Letters,2013-01-01,40(21).
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