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Quantification of mineral behavior in four dimensions: Grain boundary and substructure dynamics in salt

Borthwick, V. E.; Schmidt, S.; Piazolo, S. and Gundlach, Carsten LU (2012) In Geochemistry Geophysics Geosystems 13.
Abstract
Here we present the first four dimensional (time and three dimensional space resolved) experiment on a strongly deformed geological material. Results show that even complicated microstructures with large continuous and discontinuous changes in crystallographic orientation can be resolved quantitatively. The details that can be resolved are unprecedented and therefore the presented technique promises to become influential in a wide range of geoscientific investigations. Grain and subgrain scale processes are fundamental to mineral deformation and associated Earth Dynamics, and time resolved observation of these processes is vital for establishing an in-depth understanding of the latter. However, until recently, in situ experiments were... (More)
Here we present the first four dimensional (time and three dimensional space resolved) experiment on a strongly deformed geological material. Results show that even complicated microstructures with large continuous and discontinuous changes in crystallographic orientation can be resolved quantitatively. The details that can be resolved are unprecedented and therefore the presented technique promises to become influential in a wide range of geoscientific investigations. Grain and subgrain scale processes are fundamental to mineral deformation and associated Earth Dynamics, and time resolved observation of these processes is vital for establishing an in-depth understanding of the latter. However, until recently, in situ experiments were restricted to observations of two dimensional surfaces. We compared experimental results from two dynamic, in situ annealing experiments on a single halite crystal; a 2D experiment conducted inside the scanning electron microscope and a 3D X-ray diffraction experiment. This allowed us to evaluate the possible effects of the free surface on grain and subgrain processes. The extent to which surface effects cause experimental artifacts in 2D studies has long been questioned. Our study shows that, although the nature of recovery processes are the same, the area swept by subgrain boundaries is up to 5 times larger in the volume than observed on the surface. We suggest this discrepancy is due to enhanced drag force on subgrain boundaries by thermal surface grooving. Our results show that while it is problematic to derive absolute mobilities from 2D experiments, derived relative mobilities between boundaries with different misorientation angles can be used. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
EBSD, X-ray diffraction, annealing, halite, in situ, surface effects
in
Geochemistry Geophysics Geosystems
volume
13
publisher
American Geophysical Union
external identifiers
  • wos:000303673500002
  • scopus:84861308590
ISSN
1525-2027
DOI
10.1029/2012GC004057
language
English
LU publication?
yes
id
5e826e34-dd77-42b2-8750-91a86c3c85e7 (old id 2545471)
date added to LUP
2012-05-29 15:31:00
date last changed
2017-08-27 04:49:32
@article{5e826e34-dd77-42b2-8750-91a86c3c85e7,
  abstract     = {Here we present the first four dimensional (time and three dimensional space resolved) experiment on a strongly deformed geological material. Results show that even complicated microstructures with large continuous and discontinuous changes in crystallographic orientation can be resolved quantitatively. The details that can be resolved are unprecedented and therefore the presented technique promises to become influential in a wide range of geoscientific investigations. Grain and subgrain scale processes are fundamental to mineral deformation and associated Earth Dynamics, and time resolved observation of these processes is vital for establishing an in-depth understanding of the latter. However, until recently, in situ experiments were restricted to observations of two dimensional surfaces. We compared experimental results from two dynamic, in situ annealing experiments on a single halite crystal; a 2D experiment conducted inside the scanning electron microscope and a 3D X-ray diffraction experiment. This allowed us to evaluate the possible effects of the free surface on grain and subgrain processes. The extent to which surface effects cause experimental artifacts in 2D studies has long been questioned. Our study shows that, although the nature of recovery processes are the same, the area swept by subgrain boundaries is up to 5 times larger in the volume than observed on the surface. We suggest this discrepancy is due to enhanced drag force on subgrain boundaries by thermal surface grooving. Our results show that while it is problematic to derive absolute mobilities from 2D experiments, derived relative mobilities between boundaries with different misorientation angles can be used.},
  author       = {Borthwick, V. E. and Schmidt, S. and Piazolo, S. and Gundlach, Carsten},
  issn         = {1525-2027},
  keyword      = {EBSD,X-ray diffraction,annealing,halite,in situ,surface effects},
  language     = {eng},
  publisher    = {American Geophysical Union},
  series       = {Geochemistry Geophysics Geosystems},
  title        = {Quantification of mineral behavior in four dimensions: Grain boundary and substructure dynamics in salt},
  url          = {http://dx.doi.org/10.1029/2012GC004057},
  volume       = {13},
  year         = {2012},
}