Summary
Two main geochemiscl types of granites are distingushed in the Salmi pluton: 1) ovoid biotite-hornblende granites, 2) non-ovoid biotite granites. The first one is characterized by higher CO2, CO and CH4 concentrations. The second type is rich in fluorine and shows similarities with rare metal Phanerozoic granites. Both granite types began to crystallize when Pf, < Ptot, but non-ovoid granites, which crystallized in a wider temperature range, reached conditions Pf, > POtot at the final stage. The mole fraction of carbon group gases (CO2, CO and CH4) decreases and that of H2O increases in all granites from early crystallizing minerals to those of late crystallization.
Compositional differences between ovoid biotite-hornblende and non-ovoid biotite granites are due to differences in the protolith composition.
Zusammenfassung
Zwei geochemisch charakterisierte Granittypen können innerhalb des Salmi Plutons unterschieden werden: 1) ein ovoidaler Biotit-Hornblende-Granit, und 2) ein nichtovoidaler Biotit-Granit. Der erste Typ ist durch höhere Konzentrationen von CO2, CO und CH4 charakterisiert; der zweite Granittyp ist reich an Fluor und zeigt Ähnlichkeiten mit phanerozoischen Graniten, die seltene Metalle führen. Beide Granittypen beginnen bei Pfl, < Ptot, zu kristallisieren, nicht-ovoidale Granite jedoch, deren Kristallisation in einem weiteren Temperaturbereich abläuft, erreichen im Finalstadium der Kristallisation Pfl > Ptot,-Bedingungen. In allen Graniten sinkt die Molfraktion der Kohlenstoffgasgruppe (CO2, CO und CH4) bei gleichzeitigem Anstieg von H2O, wenn man frühe Kristallisationsphasen mit späten vergleicht.
Die Unterschiede in der Zusammensetzung zwischen den ovoidalen und nichtovoidalen Graniten sind auf Unterschiede in der Protolith-Zusammensetzung zurückzuführen.
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Sviridenko, L.P. The evolution of the fluid phase during the crystallization of granite types: Salmi pluton, Karelia, Russia. Mineralogy and Petrology 50, 59–67 (1994). https://doi.org/10.1007/BF01160139
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DOI: https://doi.org/10.1007/BF01160139