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Tectonic evolution of the Iceland region, North Atlantic

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Abstract

Major hypotheses on the formation of the Iceland region are considered. It is noted that plate- and plume-tectonic genesis is the most substantiated hypothesis for this region. Model estimations of the effect of hot plume on the formation of genetically different oceanic ridges are obtained. Computer calculations are performed for the thermal subsidence rate of aseismic ridges (Ninetyeast and Hawaiian-Emperor) in the asthenosphere of the Indian and Pacific oceans. Comparative analysis of the calculated subsidence rates of these ridges with those in the Iceland region (Reykjanes and Kolbeinsey ridges) is performed. The results suggest that the thermophysical processes of formation of the spreading Reykjanes and Kolbeinsey ridges were similar to those of the aseismic Ninetyeast and Hawaiian-Emperor ridges: the genesis of all these ridges is related to the functioning of a hotspot. Analysis of the heat flux distribution in the Iceland Island and Hawaiian Rise areas is carried out. Analysis and numerical calculations indicate that the genesis of Iceland was initially characterized by the plume-tectonic transformation of a continental rather than oceanic lithosphere. The level of geothermal regime near Iceland was two times higher (100 mW/m2) relative to the Hawaiian Rise area (50 mW/m2) because the average lithosphere thickness of the Reykjanes and Kolbeinsey ridges near the Iceland was approximately two times less (40 km) relative to the thickness of the Pacific Plate (80 km) in the Hawaiian area. The main stages of evolution of the Iceland region are based on geological and geothermal data and numerical thermophysical modeling. The Cenozoic tectonic evolution of the region is considered. Paleogeodynamic reconstructions of the North Atlantic in the hotspot system at 60, 50, and 20 Ma are obtained.

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  1. Shirshov Institute of Oceanology, Russian Academy of Sciences, Nakhimovskii pr. 36, Moscow, 117997, Russia

    E. V. Verzhbitsky, M. V. Kononov, A. F. Byakov & O. V. Grinberg

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  1. E. V. Verzhbitsky
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  2. M. V. Kononov
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  3. A. F. Byakov
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Original Russian Text © E.V. Verzhbitsky, M.V. Kononov, A.F. Byakov, O.V. Grinberg, 2009, published in Geotektonika, 2009, No. 6, pp. 70–92.

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Verzhbitsky, E.V., Kononov, M.V., Byakov, A.F. et al. Tectonic evolution of the Iceland region, North Atlantic. Geotecton. 43, 501–521 (2009). https://doi.org/10.1134/S0016852109060041

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