New monazite U-Pb age constraints on the evolution of the Paleoproterozoic Vaasa granitoid batholith, western Finland

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Kotilainen , A K , Mänttäri , I , Kurhila , M , Hölttä , P & Rämö , O T 2016 , ' New monazite U-Pb age constraints on the evolution of the Paleoproterozoic Vaasa granitoid batholith, western Finland ' , Bulletin of the Geological Society of Finland , vol. 88 , pp. 5-20 . https://doi.org/10.17741/bgsf/88.1.001

Title: New monazite U-Pb age constraints on the evolution of the Paleoproterozoic Vaasa granitoid batholith, western Finland
Author: Kotilainen, Anna K.; Mänttäri, Irmeli; Kurhila, Matti; Hölttä, Pentti; Rämö, O. Tapani
Contributor: University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Geological Survey of Finland, Espoo
University of Helsinki, Geological Survey of Finland, Espoo
University of Helsinki, Department of Geosciences and Geography
Date: 2016
Language: eng
Number of pages: 16
Belongs to series: Bulletin of the Geological Society of Finland
ISSN: 0367-5211
URI: http://hdl.handle.net/10138/208457
Abstract: The Vaasa batholith, western Finland, is a large, peraluminous granitoid pluton that crystallized at 1.88-1.87 Ga during the culmination of the Svecofennian orogeny. The batholith has gradual contacts, through metatexites and diatexites, with the enveloping metasedimentary rocks of the Bothnian Belt. We present ID-TIMS U-Pb age data on monazite from granitoids and xenoliths of the Vaasa batholith and combine these with published U-Pb zircon ages in order to shed further light on the evolution of the Vaasa batholith. The apparent monazite ages for seven of the examined samples are 1870-1863 Ma, and 1855+/-3 Ma for one further sample from the southern part of the batholith. Combined with pre-existing data, the monazite ages of the granitoids are 9 to 18 Ma (face values) or 3 to 9 Ma (external errors considered) younger than the U-Pb zircon crystallization ages from respective samples. Our new data suggest slow cooling for the Vaasa batholith - the closure/saturation temperature of the monazite U-Pb system was probably reached in similar to 10 m.y. after the crystallization of magmatic zircon in the examined rocks.
Subject: 1171 Geosciences
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