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Coupling between mi...
Coupling between mineral reactions, chemical changes in groundwater, and earthquakes in Iceland
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- Andrén, Margareta (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Stockholm Univ, Dept Geol Sci, Stockholm, Sweden
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- Stockmann, Gabrielle (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Stockholm Univ, Dept Geol Sci, Stockholm, Sweden
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- Skelton, Alasdair (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Stockholm Univ, Dept Geol Sci, Stockholm, Sweden
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- Sturkell, Erik (author)
- Univ Gothenburg, Dept Earth Sci, Gothenburg, Sweden
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- Mörth, Carl-Magnus (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Stockholm Univ, Dept Geol Sci, Stockholm, Sweden
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- Guðrúnardóttir, Helga Rakel (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Stockholm Univ, Dept Geol Sci, Stockholm, Sweden
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- Keller, Nicole Simone (author)
- Univ Iceland, Inst Earth Sci, Reykjavik, Iceland
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- Odling, Nic (author)
- Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland
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- Dahrén, Börje, 1984- (author)
- Uppsala universitet,Mineralogi, petrologi och tektonik,CEMPEG
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- Broman, Curt (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Stockholm Univ, Dept Geol Sci, Stockholm, Sweden
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- Balic-Zunic, Tonci (author)
- Univ Copenhagen, Nat Hist Museum, Copenhagen, Denmark
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- Hjartarsson, Hreinn (author)
- Landsvirkjun, Reykjavik, Iceland
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- Siegmund, Heike (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Stockholm Univ, Dept Geol Sci, Stockholm, Sweden
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- Freund, Friedemann (author)
- NASA, Ames Res Ctr, Div Earth Sci, Moffett Field, CA 94035 USA
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- Kockum, Ingrid (author)
- Karolinska Institutet
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(creator_code:org_t)
- 2016
- 2016
- English.
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In: Journal of Geophysical Research - Solid Earth. - 2169-9313 .- 2169-9356. ; 121:4, s. 2315-2337
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Abstract
Subject headings
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- Chemical analysis of groundwater samples collected from a borehole at Hafralækur, northernIceland, from October 2008 to June 2015 revealed (1) a long-term decrease in concentration of Si and Naand (2) an abrupt increase in concentration of Na before each of two consecutive M > 5 earthquakes whichoccurred in 2012 and 2013, both 76 km from Hafralækur. Based on a geochemical (major elements and stableisotopes), petrological, and mineralogical study of drill cuttings taken from an adjacent borehole, we areable to show that (1) the long-term decrease in concentration of Si and Na was caused by constant volumereplacement of labradorite by analcime coupled with precipitation of zeolites in vesicles and along fracturesand (2) the abrupt increase of Na concentration before the first earthquake records a switchover tononstoichiometric dissolution of analcime with preferential release of Na into groundwater. We attributedecay of the Na peaks, which followed and coincided with each earthquake to uptake of Na along fracturedor porous boundaries between labradorite and analcime crystals. Possible causes of these Na peaks are anincrease of reactive surface area caused by fracturing or a shift from chemical equilibrium caused by mixingbetween groundwater components. Both could have been triggered by preseismic dilation, which was alsoinferred in a previous study by Skelton et al. (2014). The mechanism behind preseismic dilation so far from thefocus of an earthquake remains unknown.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- geochemistry
- Iceland
- groundwater
- earthquakes
- mineralogy
- Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
- Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Andrén, Margaret ...
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Stockmann, Gabri ...
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Skelton, Alasdai ...
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Sturkell, Erik
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Mörth, Carl-Magn ...
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Guðrúnardóttir, ...
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Keller, Nicole S ...
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Odling, Nic
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Dahrén, Börje, 1 ...
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Broman, Curt
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Balic-Zunic, Ton ...
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Hjartarsson, Hre ...
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Siegmund, Heike
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Freund, Friedema ...
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Kockum, Ingrid
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geochemistry
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
- Articles in the publication
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Journal of Geoph ...
- By the university
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Uppsala University
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Stockholm University
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Karolinska Institutet