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Zircon and monazite geochronology of deformation in the Pielavesi Shear Zone, Finland: multistage evolution of the Archaean-Proterozoic boundary in the Fennoscandian Shield
Univ KwaZulu Natal, Sch Agr, Geol Sci, Earth & Environm Sci, Private Bag X 54001, Durban, South Africa..
Univ Oulu, Dept Geosciences, Oulu 90014, Finland..
Univ Oulu, Dept Geosciences, Oulu 90014, Finland..
Geol Survey Finland, POB 96, Espoo 02151, Finland..
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2017 (English)In: Journal of the Geological Society, ISSN 0016-7649, E-ISSN 2041-479X, Vol. 174, no 2, p. 255-267Article in journal (Refereed) Published
Abstract [en]

The Raahe-Ladoga Shear Complex is a major crustal structure representing the Archaean-Palaeoproterozoic boundary in the Fennoscandian Shield. The complex developed during the Svecofennian Orogeny (c. 1.9 - 1.8 Ga) beginning with regional thrust tectonic phases D-1 and D-2, followed by large-scale shearing events D-3 and D-4. The Pielavesi Shear Zone is a vertical north-south-trending shear zone within the Raahe-Ladoga Shear Complex formed during regional D-3 shearing and later reactivated during the regional D-4 phase. Three north-south-trending elongate granitoid intrusions were selected as representative of silicic melts that intruded the transtensional Pielavesi Shear Zone during the regional D-3 phase. The oriented magmatic fabric of the granitoids indicates that they intruded coeval to the deformation event. The zircon U-(Th)-Pb secondary ionization mass spectrometry (SIMS) ages of these intrusions (1888 +/- 4, 1884 +/- 6 and 1883 +/- 5 Ma) overlap within error and provide a direct age for the regional D-3 deformation. epsilon(Hf(T)) (-1.1 to + 3.4) and epsilon(Nd(T)) (-1.2 to + 0.4) values from these granitoids are both consistent with a predominantly juvenile source affected by a minor Archaean component. U-(Th)-Pb SIMS analyses of metamorphic monazite formed within a crosscutting blastomylonite provide an age for the regional D-4 phase and associated fluid activity of 1793 +/- 3 Ma.

Place, publisher, year, edition, pages
GEOLOGICAL SOC PUBL HOUSE , 2017. Vol. 174, no 2, p. 255-267
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Geophysics
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URN: urn:nbn:se:uu:diva-320864DOI: 10.1144/jgs2016-020ISI: 000396821200006OAI: oai:DiVA.org:uu-320864DiVA, id: diva2:1091233
Available from: 2017-04-26 Created: 2017-04-26 Last updated: 2017-04-26Bibliographically approved

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Majka, Jaroslaw

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