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Title: Dissolution-Assisted Pattern Formation During Olivine Carbonation

Olivine and pyroxene bearing rocks in the oceanic crust react with hydrothermal fluids producing changes in the physical characteristics and behaviors of the altered rocks. Notably, these reactions tend to increase solid volume, reducing pore volume, permeability and available reactive surface area; yet, entirely hydrated and/or carbonated rocks are commonly observed in the field. We investigate the evolution of porosity and permeability of fractured dunites reacted with CO 2-rich solutions in laboratory experiments. The alteration of crack surfaces changes the mechanical and transport properties of the bulk samples. Analysis of three-dimensional microstructural data shows that although precipitation of secondary minerals causes the total porosity of the sample to decrease, an interconnected network of porosity is maintained through channelized dissolution and coupled carbonate precipitation. Lastly, the observed microstructure appears to be the result of chemo-mechanical coupling, which may provide a mechanism of porosity maintenance without the need to invoke reaction-driven cracking.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ;  [2] ;  [3]
  1. Univ. of Maryland, College Park, MD (United States); Stanford Univ., Stanford, CA (United States)
  2. Univ. of Maryland, College Park, MD (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 44; Journal Issue: 19; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Rock deformation; Permeability; Carbon sequestration, storage and utilization (CSSU); Ultramafic; Chemo-mechanical coupling; Fluid-rock interaction; Carbon mineralization.
OSTI Identifier:
1421960

Lisabeth, Harrison, Zhu, Wenlu, Xing, Tiange, and De Andrade, Vincent. Dissolution-Assisted Pattern Formation During Olivine Carbonation. United States: N. p., Web. doi:10.1002/2017GL074393.
Lisabeth, Harrison, Zhu, Wenlu, Xing, Tiange, & De Andrade, Vincent. Dissolution-Assisted Pattern Formation During Olivine Carbonation. United States. doi:10.1002/2017GL074393.
Lisabeth, Harrison, Zhu, Wenlu, Xing, Tiange, and De Andrade, Vincent. 2017. "Dissolution-Assisted Pattern Formation During Olivine Carbonation". United States. doi:10.1002/2017GL074393. https://www.osti.gov/servlets/purl/1421960.
@article{osti_1421960,
title = {Dissolution-Assisted Pattern Formation During Olivine Carbonation},
author = {Lisabeth, Harrison and Zhu, Wenlu and Xing, Tiange and De Andrade, Vincent},
abstractNote = {Olivine and pyroxene bearing rocks in the oceanic crust react with hydrothermal fluids producing changes in the physical characteristics and behaviors of the altered rocks. Notably, these reactions tend to increase solid volume, reducing pore volume, permeability and available reactive surface area; yet, entirely hydrated and/or carbonated rocks are commonly observed in the field. We investigate the evolution of porosity and permeability of fractured dunites reacted with CO2-rich solutions in laboratory experiments. The alteration of crack surfaces changes the mechanical and transport properties of the bulk samples. Analysis of three-dimensional microstructural data shows that although precipitation of secondary minerals causes the total porosity of the sample to decrease, an interconnected network of porosity is maintained through channelized dissolution and coupled carbonate precipitation. Lastly, the observed microstructure appears to be the result of chemo-mechanical coupling, which may provide a mechanism of porosity maintenance without the need to invoke reaction-driven cracking.},
doi = {10.1002/2017GL074393},
journal = {Geophysical Research Letters},
number = 19,
volume = 44,
place = {United States},
year = {2017},
month = {8}
}