Mineralogical aspects of CO2 sequestration during hydrothermal basalt alteration — An experimental study at 75 to 250°C and elevated pCO2

Gysi, Alexander P.; Stefánsson, Andri

doi:10.1016/j.chemgeo.2012.03.006

Cited by 85 publications

(57 citation statements)

References 55 publications

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“…It is therefore of advantage to inject at relatively high partial pressure of CO 2 ; it saves water and pore space. This predicted reaction path simulation has been confirmed by experiments in the laboratory [32,33].…”

Section: Mineral Carbon Storage Within Basaltic Rocks Review Of Expesupporting

confidence: 74%

“…The Mg-Fe-Ca carbonates at intermedia pH and Ca-carbonates to be most important at the highest pH. This is what is seen in a natural analogue in West Greenland where CO 2 rich fluids invaded basaltic rocks at low temperature [31] and basalt water CO 2 experiments in the laboratory [32,33]. The carbonates in the altered rocks in West-Greenland are with decreasing partial pressure of CO 2 ; Fe and Mg rich carbonates; at intermediate CO 2 pressure Mg-Ca carbonates dominate and at the lowest partial pressure, Ca carbonates are most common.…”

Section: Mineral Carbon Storage Within Basaltic Rocks Review Of Expementioning

confidence: 85%

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Rapid solubility and mineral storage of CO2 in basalt

et al. 2014

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The long-term security of geologic carbon storage is critical to its success and public acceptance. Much of the security risk associated with geological carbon storage stems from its buoyancy. Gaseous and supercritical CO 2 are less dense than formation waters, providing a driving force for it to escape back to the surface. This buoyancy can be eliminated by the dissolution of CO 2 into water prior to, or during its injection into the subsurface. The dissolution makes it possible to inject into fractured rocks and further enhance mineral storage of CO 2 especially if injected into silicate rocks rich in divalent metal cations such as basalts and ultra-mafic rocks. We have demonstrated the dissolution of CO 2 into water during its injection into basalt leading to its geologic solubility storage in less than five minutes and potential geologic mineral storage within few years after injection [1][2][3]. The storage potential of CO 2 within basaltic rocks is enormous. All the carbon released from burning of all fossil fuel on Earth, 5000 GtC, can theoretically be stored in basaltic rocks [4].

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Section: Mineral Carbon Storage Within Basaltic Rocks Review Of Expesupporting

confidence: 74%

Section: Mineral Carbon Storage Within Basaltic Rocks Review Of Expementioning

confidence: 85%

Rapid solubility and mineral storage of CO2 in basalt

et al. 2014

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“…Chemical analysis indicates a high content of Mg and Fe (Sveinbjörnsdottir 1992;Ehlmann et al 2012;Gysi and Stefansson 2012a;Alfredsson et al 2013), which is compatible with a saponite structure. Saponites are very common corrosion products of basaltic glass alteration (Thien et al 2010 and references therein) under anoxic or oxic weathering conditions (Catalano 2013).…”

Section: Geochemical Model Setupmentioning

confidence: 69%

Differential alteration of basaltic lava flows and hyaloclastites in Icelandic hydrothermal systems

2015

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Geological field observations evidence that active and fossil Icelandic hydrothermal systems are typically embedded into an intercalation of almost completely altered and nearly unaltered volcanic rock layers. We investigated the reasons for this finding with help of geochemical reaction path calculations, by studying the mineralogical evolution of contrasting lithofacies-basalt flows and hyaloclastites at various temperatures and pressures, different recharge water composition, and gas content. From this study, we conclude that the initial porosity of protoliths and volume changes due to their transformation into secondary minerals are sufficient to explain the different extents of alteration as observed in field studies. In addition, we present a generalized kinetic model to estimate the alteration time of glassy fragments in hyaloclastite as a function of grain size, surface roughness, and temperature. This time was found to be rather short, ranging from a few hours to a few years.

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“…In the model, non-thermal surface water is assumed to percolate into the ground where it heats up and reacts with basaltic host rock under geothermal conditions. Upon progressive fluid-rock interaction, the pH of the solution increases due to consumption of H + by the primary mineral dissolution and formation of geothermal secondary minerals (Gysi and Stefánsson, 2012). Moreover, the speciation of chlorine changes as a function of progressive fluid-rock interaction with Cl − (aq) predominating the system and NaCl(aq) and HCl(aq) becoming progressively more and less important, respectively.…”

Section: Effects Of Fluid-rock Interaction Boiling and Aqueous Specimentioning

confidence: 99%

Chlorine isotope geochemistry of Icelandic thermal fluids: Implications for geothermal system behavior at divergent plate boundaries

Stefánsson

Barnes

2016

Earth and Planetary Science Letters

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Mineralogical aspects of CO2 sequestration during hydrothermal basalt alteration — An experimental study at 75 to 250°C and elevated pCO2

Cited by 85 publications

References 55 publications

Rapid solubility and mineral storage of CO2 in basalt

Rapid solubility and mineral storage of CO2 in basalt

Differential alteration of basaltic lava flows and hyaloclastites in Icelandic hydrothermal systems

Chlorine isotope geochemistry of Icelandic thermal fluids: Implications for geothermal system behavior at divergent plate boundaries

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