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4D porosity evolution during pressure-solution of NaCl in the presence of phyllosilicates

Macente, Alice; Fusseis, Florian; Butler, Ian B.; Tudisco, Erika LU ; Hall, Stephen A. LU and Andò, Edward (2018) In Earth and Planetary Science Letters 502. p.115-125
Abstract

Pressure-solution creep is one of the most common crustal deformation mechanisms, inducing changes in the porosity and permeability of rocks. For a variety of rock types undergoing pressure solution, it has been shown that the presence of phyllosilicates may significantly enhance the rate of the pressure-solution process. In this experimental investigation, we present 4-dimensional (three dimensions + time) X-ray microtomographic data that contrast deformation by pressure-solution of a pure NaCl aggregate with that of a mixture of NaCl and biotite. The results show that for mixed samples (NaCl+biotite), phyllosilicates induce a marked reduction in porosity and pore connectivity and contribute to an increase in the local strain rates by... (More)

Pressure-solution creep is one of the most common crustal deformation mechanisms, inducing changes in the porosity and permeability of rocks. For a variety of rock types undergoing pressure solution, it has been shown that the presence of phyllosilicates may significantly enhance the rate of the pressure-solution process. In this experimental investigation, we present 4-dimensional (three dimensions + time) X-ray microtomographic data that contrast deformation by pressure-solution of a pure NaCl aggregate with that of a mixture of NaCl and biotite. The results show that for mixed samples (NaCl+biotite), phyllosilicates induce a marked reduction in porosity and pore connectivity and contribute to an increase in the local strain rates by an order of magnitude over pure NaCl samples. At the same time, phyllosilicates do not induce strain localization in the sample. We discuss various possible explanations for these observations including a possible positive feedback between the porosity distribution and pressure solution. Our study yields novel insights into the local effects of phyllosilicates during pressure-solution creep and provides full 4-dimensional imaging and characterization of the coupled evolution of porosity and pore connectivity over previously unprecedented experimental time scales.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
digital volume correlation, geochemical self-organization, phyllosilicates, pressure-solution creep, X-ray microtomography
in
Earth and Planetary Science Letters
volume
502
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:85053189921
ISSN
0012-821X
DOI
10.1016/j.epsl.2018.08.032
language
English
LU publication?
yes
id
4a7773f0-a0bc-4244-b16d-bec021a1e63d
date added to LUP
2018-10-05 12:19:35
date last changed
2019-03-12 04:15:35
@article{4a7773f0-a0bc-4244-b16d-bec021a1e63d,
  abstract     = {<p>Pressure-solution creep is one of the most common crustal deformation mechanisms, inducing changes in the porosity and permeability of rocks. For a variety of rock types undergoing pressure solution, it has been shown that the presence of phyllosilicates may significantly enhance the rate of the pressure-solution process. In this experimental investigation, we present 4-dimensional (three dimensions + time) X-ray microtomographic data that contrast deformation by pressure-solution of a pure NaCl aggregate with that of a mixture of NaCl and biotite. The results show that for mixed samples (NaCl+biotite), phyllosilicates induce a marked reduction in porosity and pore connectivity and contribute to an increase in the local strain rates by an order of magnitude over pure NaCl samples. At the same time, phyllosilicates do not induce strain localization in the sample. We discuss various possible explanations for these observations including a possible positive feedback between the porosity distribution and pressure solution. Our study yields novel insights into the local effects of phyllosilicates during pressure-solution creep and provides full 4-dimensional imaging and characterization of the coupled evolution of porosity and pore connectivity over previously unprecedented experimental time scales.</p>},
  author       = {Macente, Alice and Fusseis, Florian and Butler, Ian B. and Tudisco, Erika and Hall, Stephen A. and Andò, Edward},
  issn         = {0012-821X},
  keyword      = {digital volume correlation,geochemical self-organization,phyllosilicates,pressure-solution creep,X-ray microtomography},
  language     = {eng},
  month        = {11},
  pages        = {115--125},
  publisher    = {Elsevier},
  series       = {Earth and Planetary Science Letters},
  title        = {4D porosity evolution during pressure-solution of NaCl in the presence of phyllosilicates},
  url          = {http://dx.doi.org/10.1016/j.epsl.2018.08.032},
  volume       = {502},
  year         = {2018},
}