Paleohydrogeological events in Forsmark, central Sweden, recorded by stable isotopes in calcite and pyrite
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.
B.Sandstr(o)m E.L.Tullborg
Earth Sciences Centre, G(o)teborg University, G(o)teborg, Sweden Terralogica AB, Gr(a)bo, Sweden
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
773-776
2007-07-31(万方平台首次上网日期,不代表论文的发表时间)