Age and origin of the corundum-bearing rocks of Khitostrov Island, Northern Karelia
作者： D. P. Krylov , E. B. Sal’nikova , A. M. Fedoseenko , S. Z. Yakovleva , Yu. V. Plotkina
DOI: 10.1134/S086959111101005X
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摘要: 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 explained influence meteoric waters that were modified through evaporation-precipitation cycles (Rayleigh distillation) under cold climatic conditions. In order estimate whether decrease in occurred prior metamorphism protoliths Sequence or during water percolation course metamorphic postmetamorphic transformations, we studied oxygen composition and minerals conducted U-Pb dating on single zircons from corundumbearing Khitostrov.
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