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Journal of Petrology | Volume 44 | Number 9 | Pages 1681-1701 | 2003
© Oxford University Press 2003

Petrogenesis of the Post-kinematic Magmatism of the Central Finland Granitoid Complex II; Sources and Magmatic Evolution

BRENT A. ELLIOTT*

DEPARTMENT OF PHYSICS AND EARTH SCIENCE, UNIVERSITY OF NORTH ALABAMA, FLORENCE, AL 35632-0001, USA

* Telephone: (256) 765-4482. Fax: (256) 765-4795. E-mail: baelliott{at}una.edu

The 1·88–1·87 Ga post-kinematic granitoids of the Central Finland Granitoid Complex (CFGC) provide a key geochemical link to understanding granite formation in Paleoproterozoic orogenic and post-orogenic terrains. Thickness of the crust and intra-crustal differentiation processes played an important role in the formation of three granitoid types that shortly followed the peak of the Svecofennian orogeny. In the eastern CFGC, pyroxene-bearing plutons with C-type geochemical affinities predominate. These were formed from a mixture of low- to moderate-degree partial melts (~30%) of mafic mantle-derived (basaltic, ~49% SiO2) source rocks and partial melts of pre-existing mafic granulite lower crust at depth. In the western CFGC, high-silica, iron-rich, fluorite-bearing plutons with A-type granite characteristics predominate. A higher thermal gradient, thinner upper and lower crust, and significantly more shallow Moho depth resulted in higher proportions of crustal melts (0·3–0·4 vs 0·1–0·2 in the eastern CFGC) incorporated into the partial melts of a mafic mantle-derived source. A geochemical model focusing on the Jämsä and Honkajoki plutons of the post-kinematic suite is presented, constraining the nature of the source rock(s), the degree of partial melting, proportions of partial melts and fractionation processes involved.

KEY WORDS: magmatic evolution; geochemistry; Proterozoic; granite; Finland


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H. K. Brueckner
Subduction of continental crust, the origin of post-orogenic granitoids (and anorthosites?) and the evolution of Fennoscandia
Journal of the Geological Society, July 1, 2009; 166(4): 753 - 762.
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