Abstract
The paper presents data on amphibolites dredged during Cruise 249 of the German R/V Sonne at three sites: one at the northwestern termination of the Stalemate Ridge (ocean-side slope of the Aleutian Trench) and two at the western slope of the north Shirshov Rise (in the western sector of the Bering Sea). Data on the petrography and geochemistry of the amphibolites and their estimated P–T metamorphic parameters provide an insight into the probable geodynamic environments in which their protoliths were formed and into the geodynamic regime of their metamorphism. The magmatic protolith of amphibolites in the Shirshov Rise was produced by the melting of a strongly depleted mantle source and, perhaps, was a product of suprasubductional magmatism. The isotope composition and distribution of HFSE in amphibolites from the Stalemate Ridge suggest that the protolith of these rocks was a derivative of tholeiitic melt parental for N-MORB. The typical mineral assemblage and P–T metamorphic parameters of glaucophane-bearing amphibolites from the Shirshov Rise indicate that the protolith of these rocks was metamorphosed within a subduction zone related to the Cretaceous–Paleogene Olyutorsky Arc. Interpretations of the age and geodynamic nature of metamorphism of amphibolites in the Stalemate Ridge based on currently available data cannot be regarded as absolutely realistic, and the most likely scenario for the origin of the amphibolites is that they were produced within a subduction zone that was no younger than 55–50 Ma and preceded the modern Aleutian Arc. The extinction of this ancient subduction zone should have been associated with the development of the Aleutian Arc north of it. According to this geodynamic scenario, an ophiolite sequence was produced where the ancient subduction zone had occurred. The ophiolite consisted of rocks of an mafic–ultramafic association and amphibolites. This scenario may, however, be a matter of further discussion.
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ACKNOWLEDGMENTS
The authors thank M.V. Portnyagin, K. Hernle, and R. Werner for close cooperation in the course of Cruise 249 of the R/V Sonne. The authors thank the reviewer for the very useful comments, which allowed us to improve the manuscript and modify the conclusions.
Funding
Cruise SO249 was carried out under the Bering Project (2016) and was supported by the Ministry for Education and Science of Germany. This study was supported by Russian Foundation for Basic Research, project no. 18-05-00001a and government-financed research project 0137-2019-0012 “Petrology, Geochemistry, and Geodynamics of Processes Controlling the Origin and Evolution of the Oceanic and Continental Lithosphere”.
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Translated by E. Kurdyukov
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Silantyev, S.A., Gryaznova, A.S. & Shabykova, V.V. Amphibolites of the Stalemate Ridge and Shirshov Rise, Northwest Pacific: Indicators of the Geodynamic Regime of Metamorphism at the Convergent Plate Boundary. Geochem. Int. 59, 213–228 (2021). https://doi.org/10.1134/S0016702921030095
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DOI: https://doi.org/10.1134/S0016702921030095