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Fracture mineralogy of the Forsmark site. SDM Forsmark

SKB R-08-102

Författare och institution:
Björn Sandström (Institutionen för geovetenskaper); Eva-Lena Tullborg (-); John Smellie (-); Angus B MacKenzie (-); Juhani Suksi (-)
Antal sidor:
Svensk Kärnbränslehantering AB
Sammanfattning (abstract):
Detailed investigations of the fracture mineralogy and altered wall rock have been carried out as part of the site characterisation programme between 2003 and 2007 at Forsmark. The results have been published in a number of P-reports and in contributions to scientific journals. This report summarises and evaluates the data obtained during the detailed fracture mineralogical studies. The report includes descriptions of the identified fracture minerals and their chemical composition. A sequence of fracture mineralisations has been distinguished and provides information of the low to moderate temperature (brittle) geological and hydrogeological evolution at the site. Special focus has been paid to the chemical and stable isotopic composition of calcite to obtain palaeohydrogeological information. Chemical analyses of bulk fracture filling material have been carried out to identify possible sinks for certain elements and also to reveal the presence of minor phases rich in certain elements which have not been possible to detect by X-ray diffraction (XRD). Statistical analysis of the mineralogy in fractures outside deformation zones (i.e. within fracture domains FFM01, FFM02, FFM03 and FFM06) have been carried out concerning variation of fracture mineral distribution at depth and in different fracture domains. Uranium contents and uranium-series isotopes have been analysed on fracture coating material from hydraulically conductive fractures. Such analyses are also available from the groundwaters and the results are combined in order to reveal recent (< 1 Ma) removal/deposition of uranium in the fracture system. The redox conditions in the fracture system have been evaluated based on mineralogical and chemical indicators as well as Mössbauer analyses
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Geovetenskap och miljövetenskap
Geovetenskap och miljövetenskap ->
Geologi ->
Berggrundsgeologi och petrologi
Geovetenskap och miljövetenskap ->
Geologi ->
Postens nummer:
Posten skapad:
2008-09-24 12:38
Posten ändrad:
2009-03-13 09:21

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