Dissolution-Assisted Pattern Formation During Olivine Carbonation
Journal Article
·
· Geophysical Research Letters
- Univ. of Maryland, College Park, MD (United States); Stanford Univ., Stanford, CA (United States)
- Univ. of Maryland, College Park, MD (United States)
- 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
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 |
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Generating porosity during olivine carbonation via dissolution channels and expansion cracks
Journal Article
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Thu Jul 12 20:00:00 EDT 2018
· Solid Earth (Online)
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OSTI ID:1460149