Petrology of Nattanen-type granite complexes, Northern Finland

I. Haapala, Kai Front, E. Rantala, M Vaarma

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Abstract

The Nattanen-type granites form a group of post-tectonic and post-metamorphic 1.77 Ga-old epizonal multiple granite intrusions in the Granulite Belt—granitic gneiss surroundings in northern Finland.
The granite complexes (the Tepasto, Pomovaara and Nattanen stocks and the Riestovaara batholith in Finland and the Juvoaivi stock in the U.S.S.R.) are composed of various slightly peraluminous microcline—plagioclasebiotite granites (monzogranites) that contain sphene and magnetite as typical minor constituents.
Geochemical evolution within the complexes is demonstrated by the increase of SiO2, and Rb, and decrease of TiO2, FeO∗, MgO, CaO, Sr, Ba and Zr from the oldest to the youngest granite varieties.
Molybdenum mineralization is associated with the latest intrusive phases of the Tepasto and Juvoaivi stocks.
The isotope geochemical studies indicate a major Archaean crustal component in the source of the Nattanen stock that is situated within the early Proterozoic Granulite Belt.
Original languageEnglish
Pages (from-to)225-240
JournalPrecambrian Research
Volume35
DOIs
Publication statusPublished - 1987
MoE publication typeA1 Journal article-refereed

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