Reaction path modeling of enhanced in situ CO2 mineralization for carbon sequestration in the peridotite of the Samail Ophiolite, Sultanate of Oman

Paukert, A. N.; Matter, J. M.; Kelemen, P. B.; Shock, Everett L.; Havig, J. R.

doi:10.1016/j.chemgeo.2012.08.013

Cited by 142 publications

(162 citation statements)

References 47 publications

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“…The DIC increased as expected because of the influx of CO 2 from the atmosphere. Mg concentration was very low,~6.3 mM, probably because it was controlled by the formation of serpentine, brucite or hydrotalcite (Neal and Stanger, 1984b;Paukert et al, 2012;Chavagnac et al, 2013b). The water in the pool near this spring was covered by a thin crust of solid CaCO 3 , which inhibited influx of atmospheric CO 2 .…”

Section: Spring-water Chemistrymentioning

confidence: 99%

“…The springs were located near the village of Falaji (Spring #1) and Qafifah (Spring #2) discharging from partly serpentinized peridotite and gabbroic rocks. Samples from the two springs and the surroundings have been described elsewhere (Nicolas et al, 2000;Kelemen and Matter, 2008;Matter and Kelemen, 2009;Paukert et al, 2012;Chavagnac et al, 2013a,b). pH and alkalinity were measured in the field.…”

Section: Sampling and Analysesmentioning

confidence: 99%

“…The minerals observed are calcite and aragonite (both CaCO 3 ), as well as brucite (Mg(OH) 2 ) and antigorite ((Mg,Fe) 3 Si 2 O 5 (OH) 4 ) (Neal and Stanger, 1984a;Chavagnac et al, 2013a). Spring waters in natural systems can be considered as an analogue for CO 2 injection into ophiolites in general (Kelemen and Matter, 2008;Beinlich et al, 2010Beinlich et al, , 2012Paukert et al, 2012) and by studying the uptake of trace metals into the secondary phases, we can gain information about their mobility as a result of CO 2 injection. The aim of this study was to analyse ultramafic spring waters and the natural precipitated products to investigate the extent of trace element uptake into the solids and loss from the solution phase.…”

Section: Introductionmentioning

confidence: 99%

“…It is one of the largest and best preserved ophiolites in the world and covers~30,000 km 2 , with an average thickness of~5 km (Neal and Stanger, 1984b;Nicolas et al, 2000;Chavagnac et al, 2013a). About 30% of this volume is the ultramafic rock, peridotite, which contains mostly olivine and pyroxene and <45% silica (Nicolas et al, 2000;Kelemen and Matter, 2008 (Barnes et al, 1978;Neal and Stanger, 1984a;Paukert et al, 2012;Chavagnac et al, 2013b). As the hyperalkaline water emerges at the Earth's surface, it equilibrates with atmospheric CO 2 , carbonate minerals become supersaturated at the airÀwater interface and precipitate ( Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The Semail Ophiolite of the Sultanate of Oman is a potential site for CO 2 -charged water injection for carbon sequestration (Kelemen and Matter, 2008;Matter and Kelemen, 2009;Paukert et al, 2012). It is one of the largest and best preserved ophiolites in the world and covers~30,000 km 2 , with an average thickness of~5 km (Neal and Stanger, 1984b;Nicolas et al, 2000;Chavagnac et al, 2013a).…”

Section: Introductionmentioning

confidence: 99%

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Element scavenging by recently formed travertine deposits in the alkaline springs from the Oman Semail Ophiolite

2014

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Ultramafic rocks, such as the Semail Ophiolite in the Sultanate of Oman, are considered to be a potential storage site for CO 2 . This type of rock is rich in divalent cations that can react with dissolved CO 2 and form carbonate minerals, which remain stable over geological periods of time. Dissolution of the ophiolite mobilizes heavy metals, which can threaten the safety of surface and groundwater supplies but secondary phases, such as iron oxides, clays and carbonate minerals, can take up significant quantities of trace elements both in their structure and adsorbed on their surfaces.Hyperalkaline spring waters issuing from the Semail Ophiolites can have pH as high as 12. This water absorbs CO 2 from air, forming carbonate mineral precipitates either as thin crusts on the surface of placid water pools or bottom precipitates in turbulent waters. We investigated the composition of the spring water and the precipitates to determine the extent of trace element uptake. We collected water and travertine samples from two alkaline springs of the Semail Ophiolite. Twenty seven elements were detected in the spring waters. The bulk of the precipitate was CaCO 3 in aragonite, as needles, and rhombohedral calcite crystals. Traces of dypingite (Mg 5 (CO 3 ) 4 (OH) 2 ·5H 2 O) and antigorite ((Mg,Fe) 3 Si 2 O 5 (OH) 4 ) were also detected. The bulk precipitate contained rare earth elements and toxic metals, such as As, Ba, Cd, Sr and Pb, which indicated scavenging by the carbonate minerals. Boron and mercury were detected in the spring water but not in the carbonate phases. The results provide confidence that many of the toxic metals released by ophiolite dissolution in an engineered CO 2 injection project would be taken up by secondary phases, minimizing risk to water quality.

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Section: Spring-water Chemistrymentioning

confidence: 99%

Section: Sampling and Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Element scavenging by recently formed travertine deposits in the alkaline springs from the Oman Semail Ophiolite

2014

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Geochemical evidence for active tropical serpentinization in the Santa Elena Ophiolite, Costa Rica: An analog of a humid early Earth?

Sánchez‐Murillo

Gazel

Schwarzenbach

et al. 2014

Geochem Geophys Geosyst

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Serpentinization is a planetary process that has important consequences on geochemical cycles, supporting microbial activity through the formation of H 2 and CH 4 and having the potential to sequester atmospheric CO 2 . We present geochemical evidence of active serpentinization in the Santa Elena Ophiolite, Costa Rica which is sustained by peridotites with a degree of serpentinization less than 50% with no evidence of an internal heat source. Average spring water temperatures are 29.

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Geochemical bioenergetics during low‐temperature serpentinization: An example from the Samail ophiolite, Sultanate of Oman

Canovas

Hoehler

Shock

2017

J. Geophys. Res. Biogeosci.

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Various classes of microbial and biomolecular evidence from global studies in marine and continental settings are used to identify a set of reactions that appear to support microbial metabolism during serpentinization of ultramafic rocks. Geochemical data from serpentinizing ecosystems in the Samail ophiolite of Oman are used to evaluate the extent of disequilibria that can support this set of microbial metabolisms and to provide a ranking of potential metabolic energy sources in hyperalkaline fluids that are direct products of serpentinization. Results are used to construct hypotheses for how microbial metabolism may be supported in the subsurface for two cases: ecosystems hosted in rocks that have already undergone significant serpentinization and those hosted by deeper, active serpentinization processes.

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Reaction path modeling of enhanced in situ CO2 mineralization for carbon sequestration in the peridotite of the Samail Ophiolite, Sultanate of Oman

Cited by 142 publications

References 47 publications

Element scavenging by recently formed travertine deposits in the alkaline springs from the Oman Semail Ophiolite

Element scavenging by recently formed travertine deposits in the alkaline springs from the Oman Semail Ophiolite

Geochemical evidence for active tropical serpentinization in the Santa Elena Ophiolite, Costa Rica: An analog of a humid early Earth?

Geochemical bioenergetics during low‐temperature serpentinization: An example from the Samail ophiolite, Sultanate of Oman

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