Infra-supra structure relations of a microcline-granite dome in the Somero area, Svecofennides, SW Finland
Internal structure and deformational history of two granite domains with markedly distinct tectono-metamorphic evolutions occur in the Somero area, SW Finland. The Ruostejärvi dome, located NW of Somero, is characterized by a gently dipping core-mantle contact. The grade of metamorphism in this dome...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Geological Society of Finland
1989-12-01
|
| Series: | Bulletin of the Geological Society of Finland |
| Subjects: | |
| Online Access: | http://www.geologinenseura.fi/bulletin/Volume61/sgs_bt_061_2_pages_131_141.pdf |
| _version_ | 1818114207111970816 |
|---|---|
| author | H. Stel R. Veenhof J.M. Huizenga M. Timmerman J.M.H. Hartsink |
| author_facet | H. Stel R. Veenhof J.M. Huizenga M. Timmerman J.M.H. Hartsink |
| author_sort | H. Stel |
| collection | DOAJ |
| description | Internal structure and deformational history of two granite domains with markedly distinct tectono-metamorphic evolutions occur in the Somero area, SW Finland. The Ruostejärvi dome, located NW of Somero, is characterized by a gently dipping core-mantle contact. The grade of metamorphism in this dome increases towards the core and migmatites have the character of injection veins. In contrast, in the Halkjärvi domain (SW of Somero) all structural elements are (sub)vertical and the rocks are of high metamorphic grade over the entire domain. In this case, migmatization resulted from in situ melt generation. The two domains are separated by a WNW-ESE striking lineament. This lineament represents a zone of intense shearing that caused an upward block movement of the southern domain. The Halkjärvi domain represents the infra-structure, while in the Ruostejärvi domain a supra structure of a granite dome is exposed. The variation in supra-infra structure is discussed in relation to the mechanism of diapirism in granite domes. |
| first_indexed | 2024-12-11T03:47:03Z |
| format | Article |
| id | doaj.art-5b16f5dee00040539581f71f5f3242c3 |
| institution | Directory Open Access Journal |
| issn | 0367-5211 1799-4632 |
| language | English |
| last_indexed | 2024-12-11T03:47:03Z |
| publishDate | 1989-12-01 |
| publisher | Geological Society of Finland |
| record_format | Article |
| series | Bulletin of the Geological Society of Finland |
| spelling | doaj.art-5b16f5dee00040539581f71f5f3242c32022-12-22T01:22:00ZengGeological Society of FinlandBulletin of the Geological Society of Finland0367-52111799-46321989-12-0161213114110.17741/bgsf/61.2.001Infra-supra structure relations of a microcline-granite dome in the Somero area, Svecofennides, SW FinlandH. StelR. VeenhofJ.M. HuizengaM. TimmermanJ.M.H. HartsinkInternal structure and deformational history of two granite domains with markedly distinct tectono-metamorphic evolutions occur in the Somero area, SW Finland. The Ruostejärvi dome, located NW of Somero, is characterized by a gently dipping core-mantle contact. The grade of metamorphism in this dome increases towards the core and migmatites have the character of injection veins. In contrast, in the Halkjärvi domain (SW of Somero) all structural elements are (sub)vertical and the rocks are of high metamorphic grade over the entire domain. In this case, migmatization resulted from in situ melt generation. The two domains are separated by a WNW-ESE striking lineament. This lineament represents a zone of intense shearing that caused an upward block movement of the southern domain. The Halkjärvi domain represents the infra-structure, while in the Ruostejärvi domain a supra structure of a granite dome is exposed. The variation in supra-infra structure is discussed in relation to the mechanism of diapirism in granite domes.http://www.geologinenseura.fi/bulletin/Volume61/sgs_bt_061_2_pages_131_141.pdfgranitesdomesstructural analysismetamorphismdeformationProterozoicSomeroFinland |
| spellingShingle | H. Stel R. Veenhof J.M. Huizenga M. Timmerman J.M.H. Hartsink Infra-supra structure relations of a microcline-granite dome in the Somero area, Svecofennides, SW Finland Bulletin of the Geological Society of Finland granites domes structural analysis metamorphism deformation Proterozoic Somero Finland |
| title | Infra-supra structure relations of a microcline-granite dome in the Somero area, Svecofennides, SW Finland |
| title_full | Infra-supra structure relations of a microcline-granite dome in the Somero area, Svecofennides, SW Finland |
| title_fullStr | Infra-supra structure relations of a microcline-granite dome in the Somero area, Svecofennides, SW Finland |
| title_full_unstemmed | Infra-supra structure relations of a microcline-granite dome in the Somero area, Svecofennides, SW Finland |
| title_short | Infra-supra structure relations of a microcline-granite dome in the Somero area, Svecofennides, SW Finland |
| title_sort | infra supra structure relations of a microcline granite dome in the somero area svecofennides sw finland |
| topic | granites domes structural analysis metamorphism deformation Proterozoic Somero Finland |
| url | http://www.geologinenseura.fi/bulletin/Volume61/sgs_bt_061_2_pages_131_141.pdf |
| work_keys_str_mv | AT hstel infrasuprastructurerelationsofamicroclinegranitedomeinthesomeroareasvecofennidesswfinland AT rveenhof infrasuprastructurerelationsofamicroclinegranitedomeinthesomeroareasvecofennidesswfinland AT jmhuizenga infrasuprastructurerelationsofamicroclinegranitedomeinthesomeroareasvecofennidesswfinland AT mtimmerman infrasuprastructurerelationsofamicroclinegranitedomeinthesomeroareasvecofennidesswfinland AT jmhhartsink infrasuprastructurerelationsofamicroclinegranitedomeinthesomeroareasvecofennidesswfinland |