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Göteborgs universitets publikationer

Paleohydrogeological events in Forsmark, central Sweden, recorded by stable isotopes in calcite and pyrite

Författare och institution:
Björn Sandström (Institutionen för geovetenskaper); Eva-Lena Tullborg (-)
Publicerad i:
Bullen & Wang (eds): Water-rock Interaction: Proceedings of the 12th International Symposium on Water-Rock Interaction, Kunming, China, 1 s. 773-776
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
A large data set of stable isotopes in fracture filling calcite and pyrite has, together with detailed studies of thin sections, been applied to interpret the paleohydrogeology in Forsmark, central Sweden. Four major fracture mineral generations have been distinguished. An early period of precipitation of epidote, quartz and chlorite followed by a period of hydrothermal precipitation of calcite together with adularia, hematite, prehnite and laumontite correlating with the Sveconorwegian (Grenvillian) orogeny in western Sweden. A later period of precipitation of calcite together with e.g. quartz, pyrite and asphaltite displays an organic influence of the formation fluid and has been interpreted to be the result of circulation of fluids originating from an organic rich sedimentary cover during the Paleozoic. The youngest calcites are found in hydraulically conductive fractures and zones and may have precipitated during a long period including the present.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Geovetenskap och miljövetenskap
Geovetenskap och miljövetenskap ->
Geologi ->
Berggrundsgeologi och petrologi
Postens nummer:
Posten skapad:
2007-08-08 10:41
Posten ändrad:
2009-02-27 10:04

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