| DOI: | 10.1002/2016GL071540
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| 论文题名: | Strain-induced permeability increase in volcanic rock |
| 作者: | Farquharson J.I.; Heap M.J.; Baud P.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8378
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| EISSN: | 1944-8109
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| 出版年: | 2016
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| 卷: | 43, 期:22 | | 起始页码: | 11603
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| 结束页码: | 11610
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| 语种: | 英语
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| 英文关键词: | fault generation
; gouge
; lava domes
; outgassing
; permeability
; triaxial deformation
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| Scopus关键词: | Degassing
; Extrusion
; Fracture
; Mechanical permeability
; Structural geology
; Volcanic rocks
; Volcanoes
; Fault generations
; gouge
; Lava dome
; Micro-structural observations
; Orders of magnitude
; Permeability increase
; Triaxial deformation
; Wall-rock interface
; Rocks
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| 英文摘要: | The extrusion of dense, viscous magma typically occurs along pronounced conduit-parallel faults. To better understand the evolution of fault permeability with increasing strain, we measured the permeability of low-porosity volcanic rock samples (basalt and andesite) that were deformed in the brittle regime to various levels of inelastic strain. We observed a progressive increase in sample permeability with increasing inelastic strain (i.e., with continued sliding on the fault plane). At the maximum imposed inelastic strain (0.11), sample permeability had increased by 3 orders of magnitude or more for all sample sets. Microstructural observations show that narrow shear fractures evolve into more complex fracture systems characterized by thick zones of friction-induced cataclasis (gouge) with increasing inelastic strain. These data suggest that the permeability of conduit-parallel faults hosted in the rock at the conduit-wall rock interface will increase during lava extrusion, thus facilitating outgassing and hindering the transition to explosive behavior. ©2016. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85003874439&doi=10.1002%2f2016GL071540&partnerID=40&md5=76963c5820902ebf233185a040e66535
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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/9341
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Institut de Physique du Globe de Strasbourg (UMR 7516 CNRS), EOST, Université de Strasbourg, Strasbourg, France
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| Recommended Citation: | |
Farquharson J.I.,Heap M.J.,Baud P.. Strain-induced permeability increase in volcanic rock[J]. Geophysical Research Letters,2016-01-01,43(22).
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