Abstract
Several isotopic methods (U-Pb, Sm-Nd, Rb-Sr, and K-Ar) were applied to different rock-forming and accessory minerals to decipher the chronology of events in a separate segment of the Belomorian mobile belt. Enderbites intruded supracrustal rocks at 2.73 Ga and granodiorites were emplaced at 2.41 Ga. Immediately afterwrads, a permeable schistosity zone was formed along the enderbite-granodiorite contact. Isotopic data indicate that this zone served as a pathway for heat and fluid. The retrograde stage of regional metamorphism and subsequent cooling continued from 1.89 Ga till ∼ 1.46 Ga.
The cooling rate of the Pon’goma Island rocks is similar to that of other Precambrian complexes and amounted to ∼1.50/Ma, which is consistent with previous data on the northern segment of the Belomorian belt. Based on isotopic geochronological data, two tectonometamorphic scenarios can be proposed for the evolution of the Belomorian belt. The first scenario suggests long-term regional metamorphism, i.e., lengthy residence of the Archean and Lower Proterozoic rocks at a significant depth and high temperatures. Geochronological data for different systems (U-Pb, Sm-Nd, Rb-Sr, and K-Ar) suggest Caledonian hydrothermal cryptometamorphic processes. However the rocks of this age are absent from the study area.
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Original Russian Text © L.K. Levsky, I.M. Morozova, O.A. Levchenkov, V.S. Baikova, E.S. Bogomolov, 2009, published in Geokhimiya, 2009, No. 3, pp. 227–244.
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Levsky, L.K., Morozova, I.M., Levchenkov, O.A. et al. Isotopic-geochronological systems in metamorphic rocks: Pon’goma Island, Belomorian mobile belt. Geochem. Int. 47, 215–230 (2009). https://doi.org/10.1134/S001670290903001X
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DOI: https://doi.org/10.1134/S001670290903001X