DOI: 10.1016/j.epsl.2020.116533
论文题名: Timescales of porosity and permeability loss by solid-state sintering
作者: Ryan A.G. ; Russell J.K. ; Heap M.J. ; Zimmerman M.E. ; Wadsworth F.B.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 549 语种: 英语
中文关键词: densification
; feldspar
; gouge
; hot-pressing
; lithification
; volcano
英文关键词: Densification
; Hot pressing
; Nanocrystalline materials
; Porosity
; Structural geology
; Volcanoes
; Densification models
; Densification process
; Geologic materials
; Pressure-temperature conditions
; Sintering pressure
; Solid state sintering
; Unconsolidated granular materials
; Volcanic environment
; Sintering
; fault gouge
; feldspar
; fluid inclusion
; permeability
; porosity
; sinter
; timescale
; volcanic eruption
; volcano
英文摘要: The physical properties of granular geologic materials are transient – a variety of densification processes operate throughout Earth's crust. One such process is solid-state sintering, which causes crystalline clasts to coalesce in the absence of fluids or melt. Solid-state sintering operates wherever unconsolidated granular materials are subjected to elevated pressures and temperatures for protracted periods of time. There are, however, few studies that constrain the conditions and timescales for densification and lithification of crystalline geologic materials by solid-state sintering. Here, we present the results of hot-pressing experiments designed to cause a natural glass-free volcanic fault gouge to undergo solid-state sintering. Unconsolidated starting materials subjected to volcanic temperatures (700-900 °C) and pressures (20-70 MPa) are transformed by solid-state sintering into more-coherent porous composites over a period of 4-60 hours. The relative density and competence of experimental products increase and porosity and permeability decrease as sintering pressure, temperature and time increase. We use the experimental results to develop a robust densification model that predicts time-dependent porosity and permeability loss at a pressure-temperature range that includes volcanic and some upper-crustal environments. In these environments, solid-state sintering causes reductions in porosity and permeability of ∼0.35 and ∼104 m2, respectively, over days to months depending on pressure-temperature conditions. Applied to volcanic environments, the short timescales of solid-state sintering-driven permeability loss and lithification can dictate the efficiency of outgassing and therefore modulate eruption style (i.e., explosive vs. effusive). © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165249
Appears in Collections: 气候变化与战略
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作者单位: Volcanology and Petrology Laboratory, Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, 2020-2207 Main Mall, Vancouver, BC V6T 1Z4, Canada; Université de Strasbourg, CNRS, Institut de Physique de Globe de Strasbourg, UMR 7516, Strasbourg, F-67000, France; Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN, United States; Department of Earth Sciences, Durham University, Durham, United Kingdom
Recommended Citation:
Ryan A.G.,Russell J.K.,Heap M.J.,et al. Timescales of porosity and permeability loss by solid-state sintering[J]. Earth and Planetary Science Letters,2020-01-01,549