Continental crust is less dense than that of the oceans, and less likely to sink into the mantle. Nevertheless, an analysis of a high-pressure rock from the Swiss Alps suggests that more than one cycle of crustal sinking and return is possible.
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HANNES K. BRUECKNER
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Brueckner, H. Double-dunk tectonics. Nature Geosci 4, 136–138 (2011). https://doi.org/10.1038/ngeo1063
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DOI: https://doi.org/10.1038/ngeo1063
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