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| 2. |
- Alm, Ove
(författare)
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Experimental deformation of granitic rocks
- 1981
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Ingår i: Geologiska Föreningen i Stockholm Förhandlingar. - : Informa UK Limited. - 0016-786X. ; 103:1, s. 134-136
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Tidskriftsartikel (refereegranskat)
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| 3. |
- Alm, Ove, et al.
(författare)
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Microstructures and mechanical characteristics of the Tännäs augen gneiss, Swedish Caledonides
- 1980
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Ingår i: Geologiska föreningens i Stockholm förhandlingar. - : Informa UK Limited. - 0016-786X. ; 102:4, s. 319-334
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Tidskriftsartikel (refereegranskat)abstract
- The mechanical behaviour, microstructure and substructure of the classic Tannas augen gneiss of the Swedish Caledonides are presented. Progressive deformation of granodiorite to augen gneiss and mylonite is shown to take place in an isochemical environment with redistribution of megacrysts to surrounding matrix. Experimental deformation of natural rocks from the Tannas Augen Gneiss Nappe has been carried out in the temperature range of 20-600oC and under confining pressure of 100-700MPa. The highest strength found is for the fine-grained mylonite. The augen of the gneiss show brittle behaviour under all test conditions, and temperature has a limited effect on the ultimate strength of the matrix of the augen gneiss. Microstructures have been analysed by means of optical microscopy and transmission electron microscopy. The progressive deformation is brought about by dislocation glide and dislocation creep. Subgrain formation, recrystallization and straining of new grains are observed at all stages of the progressive deformation of the matrix while the augen behavior is brittle
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| 6. |
- Antevs, Ernst, 1888-
(författare)
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Post-glacial marine shell-beds in Bohuslän
- 1917
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Ingår i: Geologiska Föreningen i Stockholm Förhandlingar. - Stockholm : Norstedt. - 0016-786X.
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)
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| 7. |
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| 8. |
- Billström, Kjell, et al.
(författare)
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U-Pb zircon age of the Rostberget W-occurrence, northern Sweden
- 1989
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Ingår i: Geologiska föreningens i Stockholm förhandlingar. - : Informa UK Limited. - 0016-786X. ; 111:2, s. 121-126
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Tidskriftsartikel (refereegranskat)abstract
- Anomalously U-rich granites of the so-called Revsund type, associated with W- and Sn-enrichments, occur in the Gunnarn area close to Storuman in northern Sweden. At Rostberget, a swarm of thin undeformed wolframite-bearing greisen veins are situated in the interior of the Joran granite intrusion. We have dated zircons from a sample of the greisen veins with the U-Pb method. The veins are less than 1 cm wide and it is likely that the sample also contains zircons from the immediately surrounding altered granite. The mineralizing event and connected metasomatic processes probably released Zr from the granite which became available for zircon growth processes in the greisen veins. One notable feature, probably due to the greisen-forming processes, is the very high common Pb concentrations characterizing the zircons. By varying the assumed common Pb composition in the calculations, the effect on resulting intercept ages has been evaluated. The obtained age interval (1775-1782 Ma) is typical of formation ages for Revsund granites, which indicates that the mineralization event at Rostberget followed closely upon the granite emplacement. We conclude that the Revsund-type granites, which cover large areas, were generated in a narrow time interval 1790-1775 Ma ago.
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| 9. |
- Boström, Kurt, et al.
(författare)
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Distribution of Ba and Pb in primary carbonates in Långban, Sweden
- 1974
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Ingår i: Geologiska Föreningen i Stockholm Förhandlingar. - : Informa UK Limited. - 0016-786X. ; 96:4, s. 375-379
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Tidskriftsartikel (refereegranskat)abstract
- Unaltered hausmannite ores from Långban, Sweden, contain two rhombohedral carbonate phases, namely calcite and a carbonate with a disordered calcite structure; the latter with the approximate composition Ca0.4Ba0.4(Pb, Mg)0.2CO3 and cell dimensions (hexagonal setting)a = 5.12 and c = 18.12A;. The carbonate phases were emplaced together with the ore minerals before the metamorphic events, which in their turn preceded the late vein and vug forming period in Långban. It appears likely that such carbonates are much more common than was previously realized, and that they were the source of most of the Pb, Ba and Ca present in the native lead-pyrochroite veins.
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| 10. |
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