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Dissolution-Assisted Pattern Formation During Olivine Carbonation

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2017GL074393· OSTI ID:1421960
 [1];  [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)
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.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357
OSTI ID:
1421960
Alternate ID(s):
OSTI ID: 1571935
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 19 Vol. 44; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Intracrystalline Reaction-Induced Cracking in Olivine Evidenced by Hydration and Carbonation Experiments journal September 2018
Generating porosity during olivine carbonation via dissolution channels and expansion cracks posted_content April 2018
Generating porosity during olivine carbonation via dissolution channels and expansion cracks journal January 2018