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

  • J. Olsson (a1) (a2), S. L. S. Stipp (a1) and S. R. Gislason (a2)

Ultramafic rocks, such as the Semail Ophiolite in the Sultanate of Oman, are considered to be a potential storage site for CO2. This type of rock is rich in divalent cations that can react with dissolved CO2 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 CO2 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 CaCO3 in aragonite, as needles, and rhombohedral calcite crystals. Traces of dypingite (Mg5(CO3)4(OH)2·5H2O) and antigorite ((Mg,Fe)3Si2O5(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 CO2 injection project would be taken up by secondary phases, minimizing risk to water quality.

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© [2014] The Mineralogical Society of Great Britain and Ireland. This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY) licence (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Aiuppa, A., Allard, P., D’Alessandro, W., Michel, A., Parello, F., Treuil, M. and Valenza, M. (2000) Mobility and fluxes of major, minor and trace metals during basalt weathering and groundwater transport at Mt. Etna volcano (Sicily).. Geochimica et Cosmochimica Acta, 64, 1827–1841.
Alfredsson, H.A., Hardarson, B.S., Franzson, H. and Gislason, S.R. (2008) CO2 sequestration in basaltic rock at the Hellisheidi site in SW Iceland: stratigraphy and chemical composition of the rocks at the injection site. Mineralogical Magazine, 72, 1–5.
Alfredsson, H.A., Oelkers, E.H., Hardarsson, B.S., Franzson, H., Gunnlaugsson, E. and Gislason, S.R. (2013) The geology and water chemistry of the Hellisheidi, SW-Iceland carbon storage site.. International Journal of Greenhouse Gas Control, 12, 399–418.
Allison, J.D., Brown, D.S. and Novo-Gradac, K.J. (1991) MINTEQA2/PRODEFA2, a geochemical assessment model for environmental systems: Version 3.0 User’s Manual. EPA/600/3-91/021, US Environmental Protection Agency, Athens, G.o.gia, USA.
Ballirano, P., De Vito, C., Mignardi, S. and Ferrini, V. (2013) Phase transitions in the Mg-CO2-H2O system and the thermal decomposition of dypingite, Mg5(CO3)4(OH)2·5H2O: implications for geosequestration of carbon dioxide.. Chemical Geology, 340, 59–67.
Barnes, I., Oneil, J.R. and Trescases, J.J. (1978) Present day serpentinization in New Caledonia, Oman and Yugoslavia.. Geochimica et Cosmochimica Acta, 42, 144–145.
Beinlich, A., Austrheim, H., Glodny, J., Erambert, M. and Andersen, T.B. (2010) CO2 sequestration and extreme Mg depletion in serpentinized peridotite clasts from the Devonian Solund basin, SW Norway.. Geochimica et Cosmochimica Acta, 74, 6935–6964.
Beinlich, A., Plumper, O., Hovelmann, J., Austrheim, H. and Jamtveit, B. (2012) Massive serpentinite carbonation at Linnajavri, N Norway.. Terra Nova, 24, 446–455.
Botha, A. and Strydom, C.A. (2001) Preparation of a magnesium hydroxy carbonate from magnesium hydroxide. Hydrometallurgy, 62, 175–183.
Boudier, F. and Coleman, R.G. (1981) Cross section through the peridotite in the Samail Ophiolite, southeastern Oman Mountains.. Journal of Geophysical Research: Solid Earth, 86, 2573–2592.
Braithwaite, C.J.R. and Zedef, V. (1996) Hydromagnesite stromatolites and sediments in an alkaline lake, Salda Golu, Turkey.. Journal of Sedimentary Research, 66, 991–1002.
Chavagnac, V., Ceuleneer, G., Monnin, C., Lansac, B., Hoareau, G. and Boulart, C. (2013a) Mineralogical assemblages forming at hyperalkaline warm springs hosted on ultramafic rocks: a case study of Oman and Ligurian ophiolites.. Geochemistry, Geophysics, Geosystems, 14, 1–22.
Chavagnac, V., Monnin, C., Ceuleneer, G., Boulart, C. and Hoareau, G. (2013b) Characterization of hyperalkaline fluids produced by low-temperature serpentinization of mantle peridotites in the Oman and Ligurian ophiolites. Geochemistry, Geophysics, Geosystems, 14, 2496–2522.
Cheng, W. and Li, Z. (2009) Precipitation of nesquehonite from homogeneous supersaturated solutions. Crystal Research Technology, 44, 937–947.
Deelman, J.C. (1999) Low-temperature nucleation of magnesite and dolomite. Neues Jahrbuch für Mineralogie Monatshefte, 289–302.
Deelman, J.C. (2011) Low-temperature formation of dolomite and magnesite. Compact Disc Publications, Eindhoven, The Netherlands.
dos Anjos, A.P.A., Sifeddine, A., Sanders, C.J. and Patchineelam, S.R. (2011) Synthesis of magnesite at low temperature. Carbonates and Evaporites, 26, 213–215.
Flaathen, T.K., Gislason, S.R., Oelkers, E.H. and Sveinbjornsdottir, A.E. (2009) Chemical evolution of the Mt. Hekla, Iceland, groundwaters: a natural analogue for CO2 sequestration in basaltic rocks. Applied Geochemistry, 24, 463–474.
Galeczka, I., Wolff-Boenisch, D. and Gislason, S.R. (2013) Experimental studies of basalt-H2O-CO2 interaction with a high pressure column flow reactor: the mobility of metals. Energy Procedia, 37, 5823–583.
Galeczka, I., Wolff-Boenisch, D., Oelkers, E.H. and Gislason, S.R. (2014) An experimental study of basaltic glass-H2O-CO2 interaction at 22 and 50ºC: implications for subsurface storage of CO2 . Geochimica et Cosmochimica Acta, 126, 123–145.
Gislason, S.R. and Oelkers, E.H. (2014) Carbon storage in basalt. Science, 344, 373–374.
Gislason, S.R., Arnorsson, S. and Armannsson, H. (1996) Chemical weathering of basalt in southwest Iceland: effects of runoff, age of rocks and vegetative/glacial cover.. American Journal of Science, 296, 837–907.
Gislason, S.R., Wolff-Boenisch, D., Stefansson, A., Oelkers, E.H., Gunnlaugsson, E., Sigurdardottir, H., Sigfusson, B., Broecker, W.S., Matter, J.M., Stute, M., Axelsson, G. and Fridriksson, T. (2010) Mineral sequestration of carbon dioxide in basalt: a preinjection overview of the CarbFix project. International Journal of Greenhouse Gas Control, 4, 537–545.
Gran, G. (1952) Determination of the equivalence point in potentiometric titrations. Part II. Analyst, 77, 661–671.
Hopkinson, L., Rutt, K. and Cressey, G. (2008) The transformation of nesquehonite to hydromagnesite in the system CaO-MgO-H2O-CO2: an experimental FT-Raman spectroscopic study. Journal of Geology, 116, 387–400.
Hsu, K.J. (1967) Chemistry of Dolomite Formation. Pp. 169–191 in: Carbonate Rocks – Physical and Chemical Aspects (G.V. Chilingar, H.J. Bissell, and R.W. Fairbridge, editors). Developments in Sedimentology, Elsevier, Amsterdam.
Hänchen, M., Prigiobbe, V., Baciocchi, R. and Mazzotti, M. (2008) Precipitation in the Mg-carbonate system – effects of temperature and CO2 pressure. Chemical Engineering Science, 63, 1012–1028.
Jähne, B.,Münnich, K.O., Bösinger, R., Dutzi, A., Huber, W. and Libner, P. (1987) On the parameters influencing air-water gas exchange. Journal of Geophysical Research C: Oceans, 92, 1937–1949.
Kelemen, P.B. and Matter, J. (2008) In situ carbonation of peridotite for CO2 storage. Proceedings of the National Academy of Science, USA, 105, 17295–17300.
Krauskopf, K.B. and Bird, D.K. (1994) Introduction to Geochemistry. McGraw-Hill College, New York.
Lackner, K.S., Wendt, C.H., Butt, D.P., Joyce, E.L. and Sharp, D.H. (1995) Carbon dioxide disposal in carbonate minerals. Energy, 20, 1153–1170.
Mackenzie, F.T. and Andersson, A.J. (2013) The marine carbon system and ocean acidification during Phanerozoic time. Geochemical Perspectives, 2, 1–227.
Matter, J.M. and Kelemen, P.B. (2009) Permanent storage of carbon dioxide in geological reservoirs by mineral carbonation. Nature Geoscience, 2, 837–841.
McGrail, B.P., Spane, F.A., Sullivan, E.C., Bacon, D.H. and Hund, G. (2011) The Wallula basalt sequestration pilot project. Energy Procedia, 4, 5653–5660.
Ming, D.W. and Franklin, W.T. (1985) Synthesis and characterization of lansfordite and nesquehonite. Soil Science Society of America Journal, 49, 1303–1308.
Neal, C. and Stanger, G. (1984a) Calcium and magnesium-hydroxide precipitation from alkaline groundwaters in Oman, and their significance to the process of serpentinization. Mineralogical Magazine, 48, 237–241.
Neal, C. and Stanger, G. (1984b) Past and present serpentinisation of ultramafic rocks; an example from the Semail ophiolite nappe of Northern Oman. Pp. 249–275 in: The Chemistry of Weathering (J.I. Drever, editor). D. Reidel, Dordrecht, The Netherlands.
Nicolas, A., Boudier, E., Ildefonse, B. and Ball, E. (2000) Accretion of Oman and United Arab Emirates ophiolite – discussion of a new structural map. Marine Geophysical Research, 21, 147–179.
Oelkers, E.H., Gislason, S.R. and Matter, J. (2008) Mineral carbonation of CO2 . Elements, 4, 3–37.
Olsson, J., Bovet, N., Makovicky, E., Bechgaard, K., Balogh, Z. and Stipp. S.L.S. (2012) Olivine reactivity with CO2 and H2O on a microscale: implications for carbon sequestration. Geochimica et Cosmochimica Acta, 77, 86–97.
Olsson, J., StiPp. S.L.S., Dalby, K.N. and Gislason, S.R. (2013) Rapid release of metal salts and nutrients from the 2011 Grímsvötn I.e. and volcanic ash. Geochimica et Cosmochimica Acta, 123, 134–149.
Olsson, J., StiPp. S.L.S., Makovicky, E. and Gislason, S.R. (2014) Metal scavenging by calcium carbonate at the Eyjafjallajökull volcano: a carbon capture and storage analogue. Chemical Geology, 384, 135–148.
Paukert, A.N., Matter, J.M., Kelemen, P.B., Shock, E.L. and Havig, J.R. (2012) Reaction path modeling of enhanced in situ CO2 mineralization for carbon sequestration in the peridotite of the Samail Ophiolite, Sultanate of Oman.. Chemical Geology, 30–31, 86–100.
Power, I.M., Wilson, S.A., Thom, J.M., Dipple, G.M. and Southam, G. (2007) Biologically induced mineralization of dypingite by cyanobacteria from an alkaline wetland near Atlin, British Columbia, Canada.. Geochemical Transactions, 8, 13–13.
Power, I.M., Wilson, S.A., Thom, J.M., Dipple, G.M., Gabites, J.E. and Southam, G. (2009) The hydromagnesite playas of Atlin, British Columbia, Canada: a biogeochemical model for CO2 sequestration.. Chemical Geology, 260, 286–300.
Saldi, G.D., Jordan, G., Schott, J. and Oelkers, E.H. (2009) Magnesite growth rates as a function of temperature and saturation state. Geochimica et Cosmochimica Acta, 73, 5646–5657.
Stumm, W. (1992) Chemistry of the Solid–Water Interface: Processes at the Mineral–Water and Particle–Water Interface in Natural Systems. Wiley, New York.
Stumm, W. and Morgan, J. J. (1981) Aquatic Chemistry: an Introduction emphasizing Chemical Equilibria in Natural Waters. Wiley, New York.
Turekian, K.K. and Wedepohl, K.H. (1961) Distribution of the elements in some major units of the earth’s crust. Geological Society of America Bulletin, 72, 175–192.
WHO (2008) Guidelines for Drinking-Water Quality. World Health Organization, Geneva.
Wolery, T.J. (1992) EQ3/6, A Software Package for Geochemical Modeling of Aqueous Systems. Lawrence Livermore National Laboratory Report, California, USA, UCRL-MA-110662 PT I.
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Mineralogical Magazine
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