Age and origin of the corundum-bearing rocks of Khitostrov Island, Northern Karelia |
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| Authors: | D P Krylov E B Sal’nikova A M Fedoseenko S Z Yakovleva Yu V Plotkina and I V Anisimova |
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| Abstract: | The Chupa nappe of the Belomorian Complex contains aluminous silica-undersaturated rocks with corundum, which are characterized
by extremely low 18O/16O (whole-rock δ18O up to −21‰). Revealed isotopic anomalies are explained by the influence of meteoric waters that were modified through evaporation-precipitation
cycles (Rayleigh distillation) under cold climatic conditions. In order to estimate whether the decrease in δ18O occurred prior to metamorphism of the protoliths of the Chupa Sequence or during water percolation in the course of metamorphic
or postmetamorphic transformations, we studied oxygen composition in the rocks and minerals and conducted U-Pb dating on single
zircons from corundumbearing rocks of Khitostrov. |
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