On the ages of some granitoid and schist complexes in northern Finland

On the ages of some granitoid and schist complexes in northern Finland

Contact observations and most radiometric datings indicate that the large complex of granitoid rocks and migmatites in Central Lapland is late Svecokarelian (Proterozoic) in age. The geological setting of the complex suggests, however, that it previously formed the basement for the Proterozoic sedim...

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Main Author: R. Lauerma
Format: Article
Language:English
Published: Geological Society of Finland 1982-12-01
Series:Bulletin of the Geological Society of Finland
Online Access:http://www.geologinenseura.fi/bulletin/Volume54/sgs_bt_054_pages_085_100.pdf
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spelling doaj-6c918bdecc6d4c3d9114691ed4d7cc572020-11-25T01:29:38ZengGeological Society of FinlandBulletin of the Geological Society of Finland0367-52111799-46321982-12-01541-28510010.17741/bgsf/54.1-2.009On the ages of some granitoid and schist complexes in northern FinlandR. LauermaContact observations and most radiometric datings indicate that the large complex of granitoid rocks and migmatites in Central Lapland is late Svecokarelian (Proterozoic) in age. The geological setting of the complex suggests, however, that it previously formed the basement for the Proterozoic sedimentation and a source of some of the sedimentary material. About 1800 Ma ago it apparently underwent partial anatexis, especially near the Proterozoic schist belts. The concept that some parts of the schist areas of Kuusamo, Salla and Central Lapland are of Archean age is disputable. The Salla schist area, which some authors maintain is an Archean greenstone belt, is obviously Proterozoic in age. U-Pb ages reported for zircons, titanites and monazites from granitoid rocks from six localities in Kuusamo, Salla, Kemijärvi and Rovaniemi areas range from 2738 Ma to 1770 Ma. http://www.geologinenseura.fi/bulletin/Volume54/sgs_bt_054_pages_085_100.pdf
collection DOAJ
language English
format Article
sources DOAJ
author R. Lauerma
spellingShingle R. Lauerma
On the ages of some granitoid and schist complexes in northern Finland
Bulletin of the Geological Society of Finland
author_facet R. Lauerma
author_sort R. Lauerma
title On the ages of some granitoid and schist complexes in northern Finland
title_short On the ages of some granitoid and schist complexes in northern Finland
title_full On the ages of some granitoid and schist complexes in northern Finland
title_fullStr On the ages of some granitoid and schist complexes in northern Finland
title_full_unstemmed On the ages of some granitoid and schist complexes in northern Finland
title_sort on the ages of some granitoid and schist complexes in northern finland
publisher Geological Society of Finland
series Bulletin of the Geological Society of Finland
issn 0367-5211
1799-4632
publishDate 1982-12-01
description Contact observations and most radiometric datings indicate that the large complex of granitoid rocks and migmatites in Central Lapland is late Svecokarelian (Proterozoic) in age. The geological setting of the complex suggests, however, that it previously formed the basement for the Proterozoic sedimentation and a source of some of the sedimentary material. About 1800 Ma ago it apparently underwent partial anatexis, especially near the Proterozoic schist belts. The concept that some parts of the schist areas of Kuusamo, Salla and Central Lapland are of Archean age is disputable. The Salla schist area, which some authors maintain is an Archean greenstone belt, is obviously Proterozoic in age. U-Pb ages reported for zircons, titanites and monazites from granitoid rocks from six localities in Kuusamo, Salla, Kemijärvi and Rovaniemi areas range from 2738 Ma to 1770 Ma.
url http://www.geologinenseura.fi/bulletin/Volume54/sgs_bt_054_pages_085_100.pdf
work_keys_str_mv AT rlauerma ontheagesofsomegranitoidandschistcomplexesinnorthernfinland
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