Pukala intrusion, its age and connection to hydrothermal alteration in Orivesi, southwestern Finland
The Pukala intrusion is situated in the Paleoproterozoic Svecofennian domain of the Fennoscandian Shield in the contact region between the Central Finland Granitoid Complex and the Tampere Belt. The acid subvolcanic intrusion, which is in contact or close to several altered domains, mainly consists...
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2005
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ftdoajarticles:oai:doaj.org/article:4f926ad41ceb47a7b7a35d3e302c0da2 2023-05-15T16:13:04+02:00 Pukala intrusion, its age and connection to hydrothermal alteration in Orivesi, southwestern Finland M. Talikka I. Mänttäri 2005-12-01T00:00:00Z https://doi.org/10.17741/bgsf/77.2.005 https://doaj.org/article/4f926ad41ceb47a7b7a35d3e302c0da2 EN eng Geological Society of Finland http://www.geologinenseura.fi/bulletin/Volume77/TalikkaManttari.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/77.2.005 0367-5211 1799-4632 https://doaj.org/article/4f926ad41ceb47a7b7a35d3e302c0da2 Bulletin of the Geological Society of Finland, Vol 77, Iss 2, Pp 165-180 (2005) intrusions granodiorites trondhjemite geochemistry Svecofennian orogeny hydrothermal alteration absolute age U/Pb Paleoproterozoic Pukala Kutemajärvi Orivesi Finland Geology QE1-996.5 article 2005 ftdoajarticles https://doi.org/10.17741/bgsf/77.2.005 2022-12-31T07:06:13Z The Pukala intrusion is situated in the Paleoproterozoic Svecofennian domain of the Fennoscandian Shield in the contact region between the Central Finland Granitoid Complex and the Tampere Belt. The acid subvolcanic intrusion, which is in contact or close to several altered domains, mainly consists of porphyritic granodiorite and trondhjemite. The Pukala intrusion was emplaced into volcanic sequence in an island-arc or fore-arc setting before or during the early stages of the main regional deformation phase of the Svecofennian orogeny. On the basis of the geochemical data, the Pukala intrusion is a peraluminous volcanic-arc granitoid. After crystallisation at 1896 ±3 Ma, multiphase deformation and metamorphism caused alteration, recrystallisation, and orientation of the minerals, and tilted the intrusion steeply towards south. The 1851 ±5 Ma U-Pb age for titanite is connected to the late stages of the Svecofennian tectonometamorphic evolution of the region. Several hydrothermally altered domains are located in the felsic and intermediate metavolcanic rocks of the Tampere Belt within less than one kilometre south of the Pukala intrusion. Alteration is divided into three basic types: partial silica alteration, chlorite-sericite±silica alteration, and sericite alteration in shear zones. The first two types probably formed during the emplacement and crystallisation of the Pukala intrusion, and the third is linked to late shearing. Intense sericitisation and comb quartz bands in the contact of the intrusion and the altered domain at Kutemajärvi suggest that the hydrothermal system was driven by the Pukala intrusion. Article in Journal/Newspaper Fennoscandian Directory of Open Access Journals: DOAJ Articles Bulletin of the Geological Society of Finland 77 2 165 180 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
intrusions granodiorites trondhjemite geochemistry Svecofennian orogeny hydrothermal alteration absolute age U/Pb Paleoproterozoic Pukala Kutemajärvi Orivesi Finland Geology QE1-996.5 |
spellingShingle |
intrusions granodiorites trondhjemite geochemistry Svecofennian orogeny hydrothermal alteration absolute age U/Pb Paleoproterozoic Pukala Kutemajärvi Orivesi Finland Geology QE1-996.5 M. Talikka I. Mänttäri Pukala intrusion, its age and connection to hydrothermal alteration in Orivesi, southwestern Finland |
topic_facet |
intrusions granodiorites trondhjemite geochemistry Svecofennian orogeny hydrothermal alteration absolute age U/Pb Paleoproterozoic Pukala Kutemajärvi Orivesi Finland Geology QE1-996.5 |
description |
The Pukala intrusion is situated in the Paleoproterozoic Svecofennian domain of the Fennoscandian Shield in the contact region between the Central Finland Granitoid Complex and the Tampere Belt. The acid subvolcanic intrusion, which is in contact or close to several altered domains, mainly consists of porphyritic granodiorite and trondhjemite. The Pukala intrusion was emplaced into volcanic sequence in an island-arc or fore-arc setting before or during the early stages of the main regional deformation phase of the Svecofennian orogeny. On the basis of the geochemical data, the Pukala intrusion is a peraluminous volcanic-arc granitoid. After crystallisation at 1896 ±3 Ma, multiphase deformation and metamorphism caused alteration, recrystallisation, and orientation of the minerals, and tilted the intrusion steeply towards south. The 1851 ±5 Ma U-Pb age for titanite is connected to the late stages of the Svecofennian tectonometamorphic evolution of the region. Several hydrothermally altered domains are located in the felsic and intermediate metavolcanic rocks of the Tampere Belt within less than one kilometre south of the Pukala intrusion. Alteration is divided into three basic types: partial silica alteration, chlorite-sericite±silica alteration, and sericite alteration in shear zones. The first two types probably formed during the emplacement and crystallisation of the Pukala intrusion, and the third is linked to late shearing. Intense sericitisation and comb quartz bands in the contact of the intrusion and the altered domain at Kutemajärvi suggest that the hydrothermal system was driven by the Pukala intrusion. |
format |
Article in Journal/Newspaper |
author |
M. Talikka I. Mänttäri |
author_facet |
M. Talikka I. Mänttäri |
author_sort |
M. Talikka |
title |
Pukala intrusion, its age and connection to hydrothermal alteration in Orivesi, southwestern Finland |
title_short |
Pukala intrusion, its age and connection to hydrothermal alteration in Orivesi, southwestern Finland |
title_full |
Pukala intrusion, its age and connection to hydrothermal alteration in Orivesi, southwestern Finland |
title_fullStr |
Pukala intrusion, its age and connection to hydrothermal alteration in Orivesi, southwestern Finland |
title_full_unstemmed |
Pukala intrusion, its age and connection to hydrothermal alteration in Orivesi, southwestern Finland |
title_sort |
pukala intrusion, its age and connection to hydrothermal alteration in orivesi, southwestern finland |
publisher |
Geological Society of Finland |
publishDate |
2005 |
url |
https://doi.org/10.17741/bgsf/77.2.005 https://doaj.org/article/4f926ad41ceb47a7b7a35d3e302c0da2 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
Bulletin of the Geological Society of Finland, Vol 77, Iss 2, Pp 165-180 (2005) |
op_relation |
http://www.geologinenseura.fi/bulletin/Volume77/TalikkaManttari.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/77.2.005 0367-5211 1799-4632 https://doaj.org/article/4f926ad41ceb47a7b7a35d3e302c0da2 |
op_doi |
https://doi.org/10.17741/bgsf/77.2.005 |
container_title |
Bulletin of the Geological Society of Finland |
container_volume |
77 |
container_issue |
2 |
container_start_page |
165 |
op_container_end_page |
180 |
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1765998672315678720 |