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- W4361279404 abstract "Abstract An U-Pb isotopic investigation combined with REE data for titanites, zircons and coexisting accessories has been undertaken to gain insight into the formation of the Archaean peralkaline granites of the northeastern Fennoscandian shield and to test the stability of titanite during metamorphic and hydrothermal processes. The obtained set of isotope data shows that whereas more stable zircon retains a memory of the major episodes of granite evolution, the coexisting titanite provide additional information on crystallization, subsequent growth, cooling, and alteration of the plutonic complexes. In addition to titanites formed at the magmatic stages of c. 2.71 Ga and c. 2.65 Ga, the peralkaline granites contain titanite populations which have undergone major resetting at c. 1.87 Ga during the burial metamorphism related to the Svecofennian orogeny and the 1.76 Ga hydrothermal alteration near-contemporaneous with regional metamorphism of c. 1.78 Ga. The peralkaline granites which contain c. 2710 Ma titanites also includes inherited titanite grains of an age of 2795 Ma. These data support the concept that the titanite can remain a closed system to Pb diffusion at temperatures of peralkaline granite melt (< 800 °C) as long as the crystals escape magmatic or metamorphic recrystallization. Supplementary material at https://doi.org/10.6084/m9.figshare.c.6488847" @default.
- W4361279404 created "2023-03-31" @default.
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- W4361279404 date "2023-03-30" @default.
- W4361279404 modified "2023-09-30" @default.
- W4361279404 title "Evolution of the Neoarchaean Kola alkaline granites, northeastern Fennoscandian Shield: insights from SHRIMP-II titanite and zircon U-Pb isotope and rare earth elements data" @default.
- W4361279404 doi "https://doi.org/10.1144/sp537-2022-233" @default.
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