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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00003810naa a2200601 4500
001oai:gup.ub.gu.se/244023
003SwePub
008240528s2016 | |||||||||||000 ||eng|
0247 a https://gup.ub.gu.se/publication/2440232 URI
0247 a https://doi.org/10.1002/2015jb0126142 DOI
040 a (SwePub)gu
041 a eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Andren, M.4 aut
2451 0a Coupling between mineral reactions, chemical changes in groundwater, and earthquakes in Iceland
264 c 2016-04-09
264 1b American Geophysical Union (AGU),c 2016
338 a electronic2 rdacarrier
520 a Chemical analysis of groundwater samples collected from a borehole at Hafralaekur, northern Iceland, from October 2008 to June 2015 revealed (1) a long-term decrease in concentration of Si and Na and (2) an abrupt increase in concentration of Na before each of two consecutive M 5 earthquakes which occurred in 2012 and 2013, both 76km from Hafralaekur. Based on a geochemical (major elements and stable isotopes), petrological, and mineralogical study of drill cuttings taken from an adjacent borehole, we are able to show that (1) the long-term decrease in concentration of Si and Na was caused by constant volume replacement of labradorite by analcime coupled with precipitation of zeolites in vesicles and along fractures and (2) the abrupt increase of Na concentration before the first earthquake records a switchover to nonstoichiometric dissolution of analcime with preferential release of Na into groundwater. We attribute decay of the Na peaks, which followed and coincided with each earthquake to uptake of Na along fractured or porous boundaries between labradorite and analcime crystals. Possible causes of these Na peaks are an increase of reactive surface area caused by fracturing or a shift from chemical equilibrium caused by mixing between groundwater components. Both could have been triggered by preseismic dilation, which was also inferred in a previous study by Skelton et al. (2014). The mechanism behind preseismic dilation so far from the focus of an earthquake remains unknown.
650 7a NATURVETENSKAPx Geovetenskap och miljövetenskapx Geokemi0 (SwePub)105062 hsv//swe
650 7a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Geochemistry0 (SwePub)105062 hsv//eng
653 a REPLACEMENT REACTIONS
653 a RAMAN-SPECTROSCOPY
653 a KOBE EARTHQUAKE
653 a PRECURSORS
653 a PREDICTION
653 a WATER
653 a MECHANISMS
653 a ANALCIME
653 a SPRINGS
653 a GROWTH
7001 a Stockmann, G.4 aut
7001 a Skelton, A.4 aut
7001 a Sturkell, Erik,d 1962u Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences4 aut0 (Swepub:gu)xstuer
7001 a Morth, C. M.4 aut
7001 a Gudrunardottir, H. R.4 aut
7001 a Keller, N. S.4 aut
7001 a Odling, N.4 aut
7001 a Dahren, B.4 aut
7001 a Broman, C.4 aut
7001 a Balic-Zunic, T.4 aut
7001 a Hjartarson, H.4 aut
7001 a Siegmund, H.4 aut
7001 a Freund, F.4 aut
7001 a Kockum, I.4 aut
7102 a Göteborgs universitetb Institutionen för geovetenskaper4 org
7730 t Journal of Geophysical Research-Solid Earthd : American Geophysical Union (AGU)g 121:4, s. 2315-2337q 121:4<2315-2337x 2169-9313
8564 u https://gup.ub.gu.se/publication/244023x primaryx freey FULLTEXT
8564 u https://agupubs.onlinelibrary.wiley.com/doi/pdfdirect/10.1002/2015JB012614
8564 8u https://gup.ub.gu.se/publication/244023
8564 8u https://doi.org/10.1002/2015jb012614

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