Mayn

Figure A58. Mayn anomaly, interpreted as the Mayn slab, with (horizontal) [vertical] cross sections through (A)[D] the UUP07 p-wave) and (B)[D] the combined SL2013 and S40RTS s-wave models at 310 km; C) the location of the modern geological record that we interpret to have formed during the subduction of the slab.

Figure A58. Mayn anomaly, interpreted as the Mayn slab, with (horizontal) [vertical] cross sections through (A)[D] the UUP07 p-wave) and (B)[D] the combined SL2013 and S40RTS s-wave models at 310 km; C) the location of the modern geological record that we interpret to have formed during the subduction of the slab.


The Mayn anomaly (Figure A58) is located below northeastern Siberia in the upper mantle and uppermost part of the lower mantle. It is N-S trending and towards the south it touches the Bering Sea slab. It was previously imaged by Gorbatov et al. (2000) and Zhao et al. (2010). The tectonic evolution and upper mantle structure of the region leads us to interpret the Mayn anomaly as a separate slab. The location of the slab is consistent with subduction along the Shirshov Ridge in western Bering Sea. This ridge is generally interpreted to represent a Cenozoic intra-oceanic arc (Nokleberg et al., 2000; Chekhovich et al., 2012). In the tectonic model of Chekhovich et al. (2012), the Shirshov ridge underwent to a period of imbricate thrusting between 30-15 Ma, which we adopt as the period of subduction.


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