dc.contributor.author | Venugopal, D.V. | |
dc.coverage.spatial | 15121 Gjøvdal | |
dc.coverage.spatial | 15124 Bygland | |
dc.coverage.spatial | 15133 Grøssæ | |
dc.coverage.spatial | 15132 Fyresvatnet | |
dc.coverage.spatial | TELEMARK | |
dc.coverage.spatial | AGDER | |
dc.coverage.spatial | ÅMLI | |
dc.coverage.spatial | FYRESDAL | |
dc.date.accessioned | 2020-08-26T13:09:09Z | |
dc.date.available | 2020-08-26T13:09:09Z | |
dc.date.issued | 1970 | |
dc.identifier.uri | https://hdl.handle.net/11250/2674934 | |
dc.description.abstract | Geological mapping has shown that the area west of Fyresvatn, Telemark, Southern Norway, is underlain by a sequence of gneisses, quartz schists, amphibolites, migmatites and epidote bearing quartzite, together with a homogenous granite pluton. A detailed structural study has revealed four periods of folding, the first three of which are represented on a macroscopic scale throughout the area: the second and the third fold episodes in particular are responsible for the present-day regional distribution of lithologies. Field relationships and petrological descriptions of the various lithologies are presented. The regional metamorphism is shown to have attained a peak within almandine-amphibolite facies during the F2 fold phase. During the same period migmatites and gneisses were developed. The late-kinematic Fyresdal granite was probably emplaced during the latest stages of F3 or possibly the F4 folding period. Biotites ages (by Rb-Sr method) of the Fyresdal granite gave an average age of 850 +- 50 m yrs. indicating the possibility of this region having taken part in 900-1000 m year orogeny. The latest event appears to have been the intrusion of diabase dykes which transect all the earlier structures; these are probably of Permian age. | |
dc.language.iso | eng | |
dc.relation.ispartofseries | NGU (268) | |
dc.rights | Navngivelse 4.0 Internasjonal | |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | |
dc.subject | GEOKRONOLOGI | |
dc.subject | KARTLEGGING | |
dc.subject | STRUKTURGEOLOGI | |
dc.subject | OMDANNING | |
dc.subject | PETROGRAFI | |
dc.subject | MINERALOGI | |
dc.title | Geology and structure of the area west of Fyresvatn, Telemark, southern Norway. The Precambrian rocks of the Telemark area in South Central Norway no. X. | |
dc.type | Journal article | |
dc.description.localcode | 35085 | |
dc.source.pagenumber | 1-57 + ka | |