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With all your senses, you can experience people and clay interplay through the working process.
Buy the beautiful products of Hjorths Fabrik If you want to feel a fine material of Bornholm in your hands, also when you get home, you can buy the beautiful products of Hjorths Fabrik in the museum shop.
The aim of this project has been to focus on the older (Gothian or TIB-equivalents) metamorphosed magmatic rocks in Blekinge, using earlier samples already dated by conventional multigrain U-Pb (Johansson & Larsen 1989) complemented by new samples with good structural control, and apply refined dating methods, especially the NORDSIM ion microprobe, to obtain better determined magmatic crystallization ages and to study the effect of metamorphic overprinting. U-Pb dating of titanite has also been used for determining metamorphic ages.
On Bornholm, both the pervasively deformed gneisses and the more undeformed granites have been dated, using U-Pb NORDSIM spot analyses of zircon and titanite, as well as conventional U-Pb TIMS dating of titanite. The project will thus aid in defining the position of Fennoscandia within the presumed Mesoproterozoic supercontinent, its role during the break-up of this supercontinent and its reassembly into the Neoproterozoic Rodinia supercontinent during the Grenvillian-Sveconorwegian orogenic cycle.
Åke Johansson The bedrock of Blekinge in southern Sweden and the Danish island of Bornholm forms the southernmost exposed part of the Fennoscandian Shield, and has a unique evolution which this project attempts to clarify. 1.45 Ga Hallandian thermomagmatic event (term originally coined by Hubbard 1975) has been underlined, both in terms of metamorphic overprinting with new zircon growth in older rocks, and intrusive activity with crystallization of new granitoids. In an earlier NFR-supported project by me, the broad geochronological framework for the early evolution of the Blekinge province was outlined, with 1.7-1.8 Ga magmatic rocks (Västanå volcanites, ‘coastal gneiss´, Tving granite; Johansson & Larsen 1989) being deformed prior to the intrusion of the c.
During the last few years, improved methods for U-Pb age determinations, and especially the possibility to date individual growth stages in single zircon crystals using the NORDSIM ion microprobe, have led to dramatically increased knowledge about the geological evolution of the Southwest Swedish Gneiss Province / Sveconorwegian Province (e.g. However, the tectonic significance of this event is still poorly understood, in terms of whether this represents an orogenic event accompanied by deformation, or whether it is an essentially anorogenic thermomagmatic event. 1.45 Ga old Karlshamn-Spinkamåla granites (Åberg 1988 and references therein).
1.45 Ga Hallandian event in southwest Sweden, and may thus be an upper crustal manifestation of the same thermomagmatic activity.