Multi-scale characterization of pore evolution in a combustion metamorphic complex, Hatrurim basin, Israel: Combining (ultra) small-angle neutron scattering and image analysis
(2013) In Geochimica et Cosmochimica Acta 121. p.339-362- Abstract
- Backscattered scanning electron micrograph and ultra small- and small-angle neutron scattering data have been combined to provide statistically meaningful data on the pore/grain structure and pore evolution of combustion metamorphic complexes from the Hatrurim basin, Israel. Three processes, anti-sintering roughening, alteration of protolith (dehydration, decarbonation, and oxidation) and crystallization of high-temperature minerals, occurred simultaneously, leading to significant changes in observed pore/grain structures. Pore structures in the protoliths, and in low- and high-grade metamorphic rocks show surface (D-s) and mass (D-m) pore fractal geometries with gradual increases in both Ds and Dm values as a function of metamorphic... (More)
- Backscattered scanning electron micrograph and ultra small- and small-angle neutron scattering data have been combined to provide statistically meaningful data on the pore/grain structure and pore evolution of combustion metamorphic complexes from the Hatrurim basin, Israel. Three processes, anti-sintering roughening, alteration of protolith (dehydration, decarbonation, and oxidation) and crystallization of high-temperature minerals, occurred simultaneously, leading to significant changes in observed pore/grain structures. Pore structures in the protoliths, and in low- and high-grade metamorphic rocks show surface (D-s) and mass (D-m) pore fractal geometries with gradual increases in both Ds and Dm values as a function of metamorphic grade. This suggests that increases in pore volume and formation of less branching pore networks are accompanied by a roughening of pore/grain interfaces. Additionally, pore evolution during combustion metamorphism is also characterized by reduced contributions from small-scale pores to the cumulative porosity in the high-grade rocks. At high temperatures, small-scale pores may be preferentially closed by the formation of high-temperature minerals, producing a rougher morphology with increasing temperature. Alternatively, large-scale pores may develop at the expense of small-scale pores. These observations (pore fractal geometry and cumulative porosity) indicate that the evolution of pore/grain structures is correlated with the growth of high-temperature phases and is a consequence of the energy balance between pore/grain surface energy and energy arising from heterogeneous phase contacts. The apparent pore volume density further suggests that the localized time/temperature development of the high-grade Hatrurim rocks is not simply an extension of that of the low-grade rocks. The former likely represents the "hot spots (burning foci)" in the overall metamorphic terrain while the latter may represent contact aureoles. (c) 2013 Elsevier Ltd. All rights reserved. (Less)
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https://lup.lub.lu.se/record/4171747
- author
- Wang, Hsiu-Wen ; Anovitz, Lawrence M. ; Burg, Avihu ; Cole, David R. ; Allard, Lawrence F. ; Jackson, Andrew LU ; Stack, Andrew G. and Rother, Gernot
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Geochimica et Cosmochimica Acta
- volume
- 121
- pages
- 339 - 362
- publisher
- Elsevier
- external identifiers
-
- wos:000325077100022
- scopus:84883506745
- ISSN
- 0016-7037
- DOI
- 10.1016/j.gca.2013.07.034
- language
- English
- LU publication?
- yes
- id
- acdb5e90-cf1b-4f0e-9f0d-889f6ea613d2 (old id 4171747)
- date added to LUP
- 2016-04-01 09:50:33
- date last changed
- 2022-04-27 08:07:27
@article{acdb5e90-cf1b-4f0e-9f0d-889f6ea613d2,
abstract = {{Backscattered scanning electron micrograph and ultra small- and small-angle neutron scattering data have been combined to provide statistically meaningful data on the pore/grain structure and pore evolution of combustion metamorphic complexes from the Hatrurim basin, Israel. Three processes, anti-sintering roughening, alteration of protolith (dehydration, decarbonation, and oxidation) and crystallization of high-temperature minerals, occurred simultaneously, leading to significant changes in observed pore/grain structures. Pore structures in the protoliths, and in low- and high-grade metamorphic rocks show surface (D-s) and mass (D-m) pore fractal geometries with gradual increases in both Ds and Dm values as a function of metamorphic grade. This suggests that increases in pore volume and formation of less branching pore networks are accompanied by a roughening of pore/grain interfaces. Additionally, pore evolution during combustion metamorphism is also characterized by reduced contributions from small-scale pores to the cumulative porosity in the high-grade rocks. At high temperatures, small-scale pores may be preferentially closed by the formation of high-temperature minerals, producing a rougher morphology with increasing temperature. Alternatively, large-scale pores may develop at the expense of small-scale pores. These observations (pore fractal geometry and cumulative porosity) indicate that the evolution of pore/grain structures is correlated with the growth of high-temperature phases and is a consequence of the energy balance between pore/grain surface energy and energy arising from heterogeneous phase contacts. The apparent pore volume density further suggests that the localized time/temperature development of the high-grade Hatrurim rocks is not simply an extension of that of the low-grade rocks. The former likely represents the "hot spots (burning foci)" in the overall metamorphic terrain while the latter may represent contact aureoles. (c) 2013 Elsevier Ltd. All rights reserved.}},
author = {{Wang, Hsiu-Wen and Anovitz, Lawrence M. and Burg, Avihu and Cole, David R. and Allard, Lawrence F. and Jackson, Andrew and Stack, Andrew G. and Rother, Gernot}},
issn = {{0016-7037}},
language = {{eng}},
pages = {{339--362}},
publisher = {{Elsevier}},
series = {{Geochimica et Cosmochimica Acta}},
title = {{Multi-scale characterization of pore evolution in a combustion metamorphic complex, Hatrurim basin, Israel: Combining (ultra) small-angle neutron scattering and image analysis}},
url = {{http://dx.doi.org/10.1016/j.gca.2013.07.034}},
doi = {{10.1016/j.gca.2013.07.034}},
volume = {{121}},
year = {{2013}},
}