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| Titel |
Hyperalkaline Springs, Serpentinized Ultramafics, Bentonite Reaction, Exotic Life Forms and Natural Carbon Sequestration: Preliminary Studies from the Philippines |
| VerfasserIn |
C. Arcilla, W. R. Alexander, E. Vargas, M. Honrado, T. Sato, K. Fujii, M. Yamakawa, J. Argayosa, J. Lazaro, C. Pascua, I. G. McKinley |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067322
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| Zusammenfassung |
| We have examined a number of hyperalkaline (pH 9-12) springs situated in ophiolites in various locations in the Philippines (Pangasinan, Zambales, Palawan). These clearly result from interactions of groundwater with mafic minerals, but differences in major- and trace-element compositions suggest complex reactions that need further study. Such springs are associated with massive tufa-like carbonate deposits that precipitate as a result of uptake of carbon dioxide from the atmosphere, thus providing a significant locus of natural carbon sequestration (cf. calculations of 5 Gtonnes of CO2 sequestration in similar systems in the UAE). In addition, the interactions of these waters with proximal bentonite deposits provide a natural analogue for projected reactions within the engineered barriers in geological nuclear waste repositories. Lastly, initial studies on life forms inhabiting these springs suggest land-based analogues of the “extreme” environments previously investigated in hyperalkaline submarine ocean ridges. |
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