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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 04587naa a2200445 4500 | |
| 001 | oai:lup.lub.lu.se:04ed0267-de16-4f1d-8048-433dfc3b39a5 | |
| 003 | SwePub | |
| 008 | 160401s2012 | |||||||||||000 ||eng| | |
| 009 | oai:DiVA.org:ltu-3723 | |
| 024 | 7 | a https://lup.lub.lu.se/record/31392942 URI |
| 024 | 7 | a https://doi.org/10.1016/j.lithos.2012.06.0012 DOI |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-37232 URI |
| 040 | a (SwePub)lud (SwePub)ltu | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a art2 swepub-publicationtype |
| 072 | 7 | a ref2 swepub-contenttype |
| 100 | 1 | a Petersson, Jesperu Vattenfall Research & Development4 aut |
| 245 | 1 0 | a Albitization and quartz dissolution in Paleoproterozoic metagranite, central Sweden - Implications for the disposal of spent nuclear fuel in a deep geological repository |
| 264 | 1 | b Elsevier BV,c 2012 |
| 500 | a Validerad; 2012; 20120806 (ysko) | |
| 520 | a Hydrothermal alteration resulting in albitization and quartz dissolution has been identified in Paleoproterozoic metagranites down to - 1000 m elevation at Forsmark, Sweden. The alteration features were discovered during investigations to locate a site for the disposal of spent nuclear fuel in a deep geological repository. In general, albitization occurs extensively, but it is also observed locally adjacent to minor intrusive bodies of amphibolite. The altered rocks show a marked decrease in K-feldspar and an increase in quartz relative to the unaltered equivalents, resulting in an epitonalitic composition. Plagioclase is metamorphic in character and generally richer in albite than in the unaltered rocks. It is inferred that albitization was triggered by the input of basic or intermediate melts into the crust during igneous activity close to the peak of regional metamorphism at 1.87-1.86 Ga. The mineralogy of the epitonalites gives rise to an increased thermal conductivity and, thereby, a positive influence for the design and safety of a deep geological repository for spent nuclear fuel. However, the increased frequency of low conductive amphibolite in the albitized volumes, consistent with the proposed mechanism for alteration, gives a negative influence. In sharp contrast to the albitization, a majority of the occurrences of quartz dissolution, which resulted in the formation of episyenite, are located along fracture zones. Quartz dissolution took place between or after 1.8-1.7 Ga, when the bedrock was able to respond to deformation in a brittle manner. Most of the vugs left after the removal of quartz are, to a variable extent, refilled by hydrothermal assemblages, including quartz, albite, K-feldspar, hematite, chlorite and calcite. The geometry and spatial distribution of episyenite argue against an extreme fluid/rock ratio and it is inferred that the fluids had at least a moderate salinity with a temperature in excess of 300 degrees C. The dissolution process was promoted by the generation of secondary permeability localized in columnar or pipe-like volumes. The close spatial connection to fracture zones provides a basis to avoid bedrock affected by this type of alteration and, thereby, reduce the negative mechanical and hydrogeological aspects for a deep geological repository. (C) 2012 Elsevier B.V. All rights reserved. | |
| 650 | 7 | a NATURVETENSKAPx Geovetenskap och miljövetenskapx Geologi0 (SwePub)105042 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Geology0 (SwePub)105042 hsv//eng |
| 653 | a Albitization | |
| 653 | a Quartz dissolution | |
| 653 | a Epitonalite | |
| 653 | a Episyenite | |
| 653 | a Granite | |
| 653 | a Spent nuclear fuel repository | |
| 653 | a Ore Geology | |
| 700 | 1 | a Stephens, Michaelu Luleå tekniska universitet,Geovetenskap och miljöteknik4 aut0 (Swepub:ltu)micste |
| 700 | 1 | a Mattsson, Hakanu Geovista AB4 aut |
| 700 | 1 | a Möller, Charlotteu Lund University,Lunds universitet,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science,University of Lund4 aut0 (Swepub:lu)geol-cmo |
| 710 | 2 | a Vattenfall Research & Developmentb Geovetenskap och miljöteknik4 org |
| 773 | 0 | t Lithosd : Elsevier BVg 148, s. 10-26q 148<10-26x 0024-4937x 1872-6143 |
| 856 | 4 | u http://dx.doi.org/10.1016/j.lithos.2012.06.001y FULLTEXT |
| 856 | 4 8 | u https://lup.lub.lu.se/record/3139294 |
| 856 | 4 8 | u https://doi.org/10.1016/j.lithos.2012.06.001 |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-3723 |
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